ToStringStyle (Apache Commons Lang 3.20.0 API)
Description: declaration: package: org.apache.commons.lang3.builder, class: ToStringStyle

# Class ToStringStyle

java.lang.Object
org.apache.commons.lang3.builder.ToStringStyle

All Implemented Interfaces:
  `Serializable`

Direct Known Subclasses:
  `RecursiveToStringStyle, StandardToStringStyle`

public abstract class ToStringStyle extends Object implements Serializable
Controls `String` formatting for `ToStringBuilder`. The main public interface is always via `ToStringBuilder`.

These classes are intended to be used as singletons. There is no need to instantiate a new style each time. A program will generally use one of the predefined constants on this class. Alternatively, the `StandardToStringStyle` class can be used to set the individual settings. Thus most styles can be achieved without subclassing.

If required, a subclass can override as many or as few of the methods as it requires. Each object type (from `boolean` to `long` to `Object` to `int[]`) has its own methods to output it. Most have two versions, detail and summary.

For example, the detail version of the array based methods will output the whole array, whereas the summary method will just output the array length.

If you want to format the output of certain objects, such as dates, you must create a subclass and override a method.

    public class MyStyle extends ToStringStyle {

        protected void appendDetail(StringBuffer buffer, String fieldName, Object value) {
            if (value instanceof Date) {
                value = new SimpleDateFormat("yyyy-MM-dd").format(value);
            }
            buffer.append(value);
        }
    }

Since:
  1.0
See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final ToStringStyle`
  `DEFAULT_STYLE`
  The default toString style.
  `static final ToStringStyle`
  `JSON_STYLE`
  The JSON toString style.
  `static final ToStringStyle`
  `MULTI_LINE_STYLE`
  The multi line toString style.
  `static final ToStringStyle`
  `NO_CLASS_NAME_STYLE`
  The no class name toString style.
  `static final ToStringStyle`
  `NO_FIELD_NAMES_STYLE`
  The no field names toString style.
  `static final ToStringStyle`
  `SHORT_PREFIX_STYLE`
  The short prefix toString style.
  `static final ToStringStyle`
  `SIMPLE_STYLE`
  The simple toString style.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `ToStringStyle()`
  Constructs a new instance.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `append(StringBuffer buffer, String fieldName, boolean value)`
  Appends to the `toString` a `boolean` value.
  `void`
  `append(StringBuffer buffer, String fieldName, boolean[] array, Boolean fullDetail)`
  Appends to the `toString` a `boolean` array.
  `void`
  `append(StringBuffer buffer, String fieldName, byte value)`
  Appends to the `toString` a `byte` value.
  `void`
  `append(StringBuffer buffer, String fieldName, byte[] array, Boolean fullDetail)`
  Appends to the `toString` a `byte` array.
  `void`
  `append(StringBuffer buffer, String fieldName, char value)`
  Appends to the `toString` a `char` value.
  `void`
  `append(StringBuffer buffer, String fieldName, char[] array, Boolean fullDetail)`
  Appends to the `toString` a `char` array.
  `void`
  `append(StringBuffer buffer, String fieldName, double value)`
  Appends to the `toString` a `double` value.
  `void`
  `append(StringBuffer buffer, String fieldName, double[] array, Boolean fullDetail)`
  Appends to the `toString` a `double` array.
  `void`
  `append(StringBuffer buffer, String fieldName, float value)`
  Appends to the `toString` a `float` value.
  `void`
  `append(StringBuffer buffer, String fieldName, float[] array, Boolean fullDetail)`
  Appends to the `toString` a `float` array.
  `void`
  `append(StringBuffer buffer, String fieldName, int value)`
  Appends to the `toString` an `int` value.
  `void`
  `append(StringBuffer buffer, String fieldName, int[] array, Boolean fullDetail)`
  Appends to the `toString` an `int` array.
  `void`
  `append(StringBuffer buffer, String fieldName, long value)`
  Appends to the `toString` a `long` value.
  `void`
  `append(StringBuffer buffer, String fieldName, long[] array, Boolean fullDetail)`
  Appends to the `toString` a `long` array.
  `void`
  `append(StringBuffer buffer, String fieldName, short value)`
  Appends to the `toString` a `short` value.
  `void`
  `append(StringBuffer buffer, String fieldName, short[] array, Boolean fullDetail)`
  Appends to the `toString` a `short` array.
  `void`
  `append(StringBuffer buffer, String fieldName, Object[] array, Boolean fullDetail)`
  Appends to the `toString` an `Object` array.
  `void`
  `append(StringBuffer buffer, String fieldName, Object value, Boolean fullDetail)`
  Appends to the `toString` an `Object` value, printing the full `toString` of the `Object` passed in.
  `protected void`
  `appendClassName(StringBuffer buffer, Object object)`
  Appends to the `toString` the class name.
  `protected void`
  `appendContentEnd(StringBuffer buffer)`
  Appends to the `toString` the content end.
  `protected void`
  `appendContentStart(StringBuffer buffer)`
  Appends to the `toString` the content start.
  `protected void`
  `appendCyclicObject(StringBuffer buffer, String fieldName, Object value)`
  Appends to the `toString` an `Object` value that has been detected to participate in a cycle.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, boolean value)`
  Appends to the `toString` a `boolean` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, boolean[] array)`
  Appends to the `toString` the detail of a `boolean` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, byte value)`
  Appends to the `toString` a `byte` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, byte[] array)`
  Appends to the `toString` the detail of a `byte` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, char value)`
  Appends to the `toString` a `char` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, char[] array)`
  Appends to the `toString` the detail of a `char` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, double value)`
  Appends to the `toString` a `double` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, double[] array)`
  Appends to the `toString` the detail of a `double` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, float value)`
  Appends to the `toString` a `float` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, float[] array)`
  Appends to the `toString` the detail of a `float` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, int value)`
  Appends to the `toString` an `int` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, int[] array)`
  Appends to the `toString` the detail of an `int` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, int i, Object item)`
  Appends to the `toString` the detail of an `Object` array item.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, long value)`
  Appends to the `toString` a `long` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, long[] array)`
  Appends to the `toString` the detail of a `long` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, short value)`
  Appends to the `toString` a `short` value.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, short[] array)`
  Appends to the `toString` the detail of a `short` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, Object value)`
  Appends to the `toString` an `Object` value, printing the full detail of the `Object`.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, Object[] array)`
  Appends to the `toString` the detail of an `Object` array.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, Collection<?> coll)`
  Appends to the `toString` a `Collection`.
  `protected void`
  `appendDetail(StringBuffer buffer, String fieldName, Map<?,?> map)`
  Appends to the `toString` a `Map`.
  `void`
  `appendEnd(StringBuffer buffer, Object object)`
  Appends to the `toString` the end of data indicator.
  `protected void`
  `appendFieldEnd(StringBuffer buffer, String fieldName)`
  Appends to the `toString` the field end.
  `protected void`
  `appendFieldSeparator(StringBuffer buffer)`
  Appends to the `toString` the field separator.
  `protected void`
  `appendFieldStart(StringBuffer buffer, String fieldName)`
  Appends to the `toString` the field start.
  `protected void`
  `appendIdentityHashCode(StringBuffer buffer, Object object)`
  Appends the `System.identityHashCode(java.lang.Object)`.
  `protected void`
  `appendInternal(StringBuffer buffer, String fieldName, Object value, boolean detail)`
  Appends to the `toString` an `Object`, correctly interpreting its type.
  `protected void`
  `appendNullText(StringBuffer buffer, String fieldName)`
  Appends to the `toString` an indicator for `null`.
  `void`
  `appendStart(StringBuffer buffer, Object object)`
  Appends to the `toString` the start of data indicator.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, boolean[] array)`
  Appends to the `toString` a summary of a `boolean` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, byte[] array)`
  Appends to the `toString` a summary of a `byte` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, char[] array)`
  Appends to the `toString` a summary of a `char` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, double[] array)`
  Appends to the `toString` a summary of a `double` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, float[] array)`
  Appends to the `toString` a summary of a `float` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, int[] array)`
  Appends to the `toString` a summary of an `int` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, long[] array)`
  Appends to the `toString` a summary of a `long` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, short[] array)`
  Appends to the `toString` a summary of a `short` array.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, Object value)`
  Appends to the `toString` an `Object` value, printing a summary of the `Object`.
  `protected void`
  `appendSummary(StringBuffer buffer, String fieldName, Object[] array)`
  Appends to the `toString` a summary of an `Object` array.
  `protected void`
  `appendSummarySize(StringBuffer buffer, String fieldName, int size)`
  Appends to the `toString` a size summary.
  `void`
  `appendSuper(StringBuffer buffer, String superToString)`
  Appends to the `toString` the superclass toString.
  `void`
  `appendToString(StringBuffer buffer, String toString)`
  Appends to the `toString` another toString.
  `protected String`
  `getArrayEnd()`
  Gets the array end text.
  `protected String`
  `getArraySeparator()`
  Gets the array separator text.
  `protected String`
  `getArrayStart()`
  Gets the array start text.
  `protected String`
  `getContentEnd()`
  Gets the content end text.
  `protected String`
  `getContentStart()`
  Gets the content start text.
  `protected String`
  `getFieldNameValueSeparator()`
  Gets the field name value separator text.
  `protected String`
  `getFieldSeparator()`
  Gets the field separator text.
  `protected String`
  `getNullText()`
  Gets the text to output when `null` found.
  `static Map<Object,Object>`
  `getRegistry()`
  Gets the registry of objects being traversed by the `reflectionToString` methods in the current thread.
  `protected String`
  `getShortClassName(Class<?> cls)`
  Gets the short class name for a class.
  `protected String`
  `getSizeEndText()`
  Gets the end text to output when a `Collection`, `Map` or array size is output.
  `protected String`
  `getSizeStartText()`
  Gets the start text to output when a `Collection`, `Map` or array size is output.
  `protected String`
  `getSummaryObjectEndText()`
  Gets the end text to output when an `Object` is output in summary mode.
  `protected String`
  `getSummaryObjectStartText()`
  Gets the start text to output when an `Object` is output in summary mode.
  `protected boolean`
  `isArrayContentDetail()`
  Gets whether to output array content detail.
  `protected boolean`
  `isDefaultFullDetail()`
  Gets whether to use full detail when the caller doesn't specify.
  `protected boolean`
  `isFieldSeparatorAtEnd()`
  Gets whether the field separator should be added at the end of each buffer.
  `protected boolean`
  `isFieldSeparatorAtStart()`
  Gets whether the field separator should be added at the start of each buffer.
  `protected boolean`
  `isFullDetail(Boolean fullDetailRequest)`
  Is this field to be output in full detail.
  `protected boolean`
  `isUseClassName()`
  Gets whether to use the class name.
  `protected boolean`
  `isUseFieldNames()`
  Gets whether to use the field names passed in.
  `protected boolean`
  `isUseIdentityHashCode()`
  Gets whether to use the identity hash code.
  `protected boolean`
  `isUseShortClassName()`
  Gets whether to output short or long class names.
  `protected void`
  `reflectionAppendArrayDetail(StringBuffer buffer, String fieldName, Object array)`
  Appends to the `toString` the detail of an array type.
  `protected void`
  `removeLastFieldSeparator(StringBuffer buffer)`
  Remove the last field separator from the buffer.
  `protected void`
  `setArrayContentDetail(boolean arrayContentDetail)`
  Sets whether to output array content detail.
  `protected void`
  `setArrayEnd(String arrayEnd)`
  Sets the array end text.
  `protected void`
  `setArraySeparator(String arraySeparator)`
  Sets the array separator text.
  `protected void`
  `setArrayStart(String arrayStart)`
  Sets the array start text.
  `protected void`
  `setContentEnd(String contentEnd)`
  Sets the content end text.
  `protected void`
  `setContentStart(String contentStart)`
  Sets the content start text.
  `protected void`
  `setDefaultFullDetail(boolean defaultFullDetail)`
  Sets whether to use full detail when the caller doesn't specify.
  `protected void`
  `setFieldNameValueSeparator(String fieldNameValueSeparator)`
  Sets the field name value separator text.
  `protected void`
  `setFieldSeparator(String fieldSeparator)`
  Sets the field separator text.
  `protected void`
  `setFieldSeparatorAtEnd(boolean fieldSeparatorAtEnd)`
  Sets whether the field separator should be added at the end of each buffer.
  `protected void`
  `setFieldSeparatorAtStart(boolean fieldSeparatorAtStart)`
  Sets whether the field separator should be added at the start of each buffer.
  `protected void`
  `setNullText(String nullText)`
  Sets the text to output when `null` found.
  `protected void`
  `setSizeEndText(String sizeEndText)`
  Sets the end text to output when a `Collection`, `Map` or array size is output.
  `protected void`
  `setSizeStartText(String sizeStartText)`
  Sets the start text to output when a `Collection`, `Map` or array size is output.
  `protected void`
  `setSummaryObjectEndText(String summaryObjectEndText)`
  Sets the end text to output when an `Object` is output in summary mode.
  `protected void`
  `setSummaryObjectStartText(String summaryObjectStartText)`
  Sets the start text to output when an `Object` is output in summary mode.
  `protected void`
  `setUseClassName(boolean useClassName)`
  Sets whether to use the class name.
  `protected void`
  `setUseFieldNames(boolean useFieldNames)`
  Sets whether to use the field names passed in.
  `protected void`
  `setUseIdentityHashCode(boolean useIdentityHashCode)`
  Sets whether to use the identity hash code.
  `protected void`
  `setUseShortClassName(boolean useShortClassName)`
  Sets whether to output short or long class names.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### DEFAULT_STYLE

    public static final ToStringStyle DEFAULT_STYLE
    The default toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        Person@182f0db[name=John Doe,age=33,smoker=false]

  - ### MULTI_LINE_STYLE

    public static final ToStringStyle MULTI_LINE_STYLE
    The multi line toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        Person@182f0db[
          name=John Doe
          age=33
          smoker=false
        ]

  - ### NO_FIELD_NAMES_STYLE

    public static final ToStringStyle NO_FIELD_NAMES_STYLE
    The no field names toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        Person@182f0db[John Doe,33,false]

  - ### SHORT_PREFIX_STYLE

    public static final ToStringStyle SHORT_PREFIX_STYLE
    The short prefix toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        Person[name=John Doe,age=33,smoker=false]

    Since:
      2.1

  - ### SIMPLE_STYLE

    public static final ToStringStyle SIMPLE_STYLE
    The simple toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        John Doe,33,false

  - ### NO_CLASS_NAME_STYLE

    public static final ToStringStyle NO_CLASS_NAME_STYLE
    The no class name toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        [name=John Doe,age=33,smoker=false]

    Since:
      3.4

  - ### JSON_STYLE

    public static final ToStringStyle JSON_STYLE
    The JSON toString style. Using the `Person` example from `ToStringBuilder`, the output would look like this:

        {"name": "John Doe", "age": 33, "smoker": true}

    Note: Since field names are mandatory in JSON, this ToStringStyle will throw an `UnsupportedOperationException` if no field name is passed in while appending. Furthermore This ToStringStyle will only generate valid JSON if referenced objects also produce JSON when calling `toString()` on them.
    Since:
      3.4
    See Also:
      - json.org

- ## Constructor Details

  - ### ToStringStyle

    protected ToStringStyle()
    Constructs a new instance.

- ## Method Details

  - ### getRegistry

    public static Map<Object,Object> getRegistry()
    Gets the registry of objects being traversed by the `reflectionToString` methods in the current thread.
    Returns:
      Set the registry of objects being traversed.

  - ### append

    public void append(StringBuffer buffer, String fieldName, boolean value)
    Appends to the `toString` a `boolean` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, boolean[] array, Boolean fullDetail)
    Appends to the `toString` a `boolean` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the toString.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, byte value)
    Appends to the `toString` a `byte` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, byte[] array, Boolean fullDetail)
    Appends to the `toString` a `byte` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, char value)
    Appends to the `toString` a `char` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, char[] array, Boolean fullDetail)
    Appends to the `toString` a `char` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, double value)
    Appends to the `toString` a `double` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, double[] array, Boolean fullDetail)
    Appends to the `toString` a `double` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the toString.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, float value)
    Appends to the `toString` a `float` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, float[] array, Boolean fullDetail)
    Appends to the `toString` a `float` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the toString.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, int value)
    Appends to the `toString` an `int` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, int[] array, Boolean fullDetail)
    Appends to the `toString` an `int` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, long value)
    Appends to the `toString` a `long` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, long[] array, Boolean fullDetail)
    Appends to the `toString` a `long` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, Object value, Boolean fullDetail)
    Appends to the `toString` an `Object` value, printing the full `toString` of the `Object` passed in.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, Object[] array, Boolean fullDetail)
    Appends to the `toString` an `Object` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the toString.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### append

    public void append(StringBuffer buffer, String fieldName, short value)
    Appends to the `toString` a `short` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `value` - the value to add to the `toString`.

  - ### append

    public void append(StringBuffer buffer, String fieldName, short[] array, Boolean fullDetail)
    Appends to the `toString` a `short` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.
      `array` - the array to add to the `toString`.
      `fullDetail` - `true` for detail, `false` for summary info, `null` for style decides.

  - ### appendClassName

    protected void appendClassName(StringBuffer buffer, Object object)
    Appends to the `toString` the class name.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `object` - the `Object` whose name to output.

  - ### appendContentEnd

    protected void appendContentEnd(StringBuffer buffer)
    Appends to the `toString` the content end.
    Parameters:
      `buffer` - the `StringBuffer` to populate.

  - ### appendContentStart

    protected void appendContentStart(StringBuffer buffer)
    Appends to the `toString` the content start.
    Parameters:
      `buffer` - the `StringBuffer` to populate.

  - ### appendCyclicObject

    protected void appendCyclicObject(StringBuffer buffer, String fieldName, Object value)
    Appends to the `toString` an `Object` value that has been detected to participate in a cycle. This implementation will print the standard string value of the value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended
      `value` - the value to add to the `toString`, not `null`.
    Since:
      2.2

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, boolean value)
    Appends to the `toString` a `boolean` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, boolean[] array)
    Appends to the `toString` the detail of a `boolean` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, byte value)
    Appends to the `toString` a `byte` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, byte[] array)
    Appends to the `toString` the detail of a `byte` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, char value)
    Appends to the `toString` a `char` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, char[] array)
    Appends to the `toString` the detail of a `char` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, Collection<?> coll)
    Appends to the `toString` a `Collection`.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `coll` - the `Collection` to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, double value)
    Appends to the `toString` a `double` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, double[] array)
    Appends to the `toString` the detail of a `double` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, float value)
    Appends to the `toString` a `float` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, float[] array)
    Appends to the `toString` the detail of a `float` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, int value)
    Appends to the `toString` an `int` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, int i, Object item)
    Appends to the `toString` the detail of an `Object` array item.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `i` - the array item index to add.
      `item` - the array item to add.
    Since:
      3.11

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, int[] array)
    Appends to the `toString` the detail of an `int` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, long value)
    Appends to the `toString` a `long` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, long[] array)
    Appends to the `toString` the detail of a `long` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, Map<?,?> map)
    Appends to the `toString` a `Map`.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `map` - the `Map` to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, Object value)
    Appends to the `toString` an `Object` value, printing the full detail of the `Object`.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, Object[] array)
    Appends to the `toString` the detail of an `Object` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, short value)
    Appends to the `toString` a `short` value.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`.

  - ### appendDetail

    protected void appendDetail(StringBuffer buffer, String fieldName, short[] array)
    Appends to the `toString` the detail of a `short` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendEnd

    public void appendEnd(StringBuffer buffer, Object object)
    Appends to the `toString` the end of data indicator.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `object` - the `Object` to build a `toString` for.

  - ### appendFieldEnd

    protected void appendFieldEnd(StringBuffer buffer, String fieldName)
    Appends to the `toString` the field end.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.

  - ### appendFieldSeparator

    protected void appendFieldSeparator(StringBuffer buffer)
    Appends to the `toString` the field separator.
    Parameters:
      `buffer` - the `StringBuffer` to populate.

  - ### appendFieldStart

    protected void appendFieldStart(StringBuffer buffer, String fieldName)
    Appends to the `toString` the field start.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name.

  - ### appendIdentityHashCode

    protected void appendIdentityHashCode(StringBuffer buffer, Object object)
    Appends the `System.identityHashCode(java.lang.Object)`.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `object` - the `Object` whose id to output.

  - ### appendInternal

    protected void appendInternal(StringBuffer buffer, String fieldName, Object value, boolean detail)
    Appends to the `toString` an `Object`, correctly interpreting its type.

    This method performs the main lookup by Class type to correctly route arrays, `Collection`s, `Map`s and `Objects` to the appropriate method.

    Either detail or summary views can be specified.

    If a cycle is detected, an object will be appended with the `Object.toString()` format.

    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`, not `null`.
      `detail` - output detail or not.

  - ### appendNullText

    protected void appendNullText(StringBuffer buffer, String fieldName)
    Appends to the `toString` an indicator for `null`.

    The default indicator is `"<null>"`.

    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.

  - ### appendStart

    public void appendStart(StringBuffer buffer, Object object)
    Appends to the `toString` the start of data indicator.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `object` - the `Object` to build a `toString` for.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, boolean[] array)
    Appends to the `toString` a summary of a `boolean` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, byte[] array)
    Appends to the `toString` a summary of a `byte` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, char[] array)
    Appends to the `toString` a summary of a `char` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, double[] array)
    Appends to the `toString` a summary of a `double` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate
      `fieldName` - the field name, typically not used as already appended
      `array` - the array to add to the `toString`, not `null`

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, float[] array)
    Appends to the `toString` a summary of a `float` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, int[] array)
    Appends to the `toString` a summary of an `int` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, long[] array)
    Appends to the `toString` a summary of a `long` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, Object value)
    Appends to the `toString` an `Object` value, printing a summary of the `Object`.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `value` - the value to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, Object[] array)
    Appends to the `toString` a summary of an `Object` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummary

    protected void appendSummary(StringBuffer buffer, String fieldName, short[] array)
    Appends to the `toString` a summary of a `short` array.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.

  - ### appendSummarySize

    protected void appendSummarySize(StringBuffer buffer, String fieldName, int size)
    Appends to the `toString` a size summary.

    The size summary is used to summarize the contents of `Collection`s, `Map`s and arrays.

    The output consists of a prefix, the passed in size and a suffix.

    The default format is `"<size=n>"`.

    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `size` - the size to append.

  - ### appendSuper

    public void appendSuper(StringBuffer buffer, String superToString)
    Appends to the `toString` the superclass toString.

    NOTE: It assumes that the toString has been created from the same ToStringStyle.

    A `null` `superToString` is ignored.

    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `superToString` - the `super.toString()`.
    Since:
      2.0

  - ### appendToString

    public void appendToString(StringBuffer buffer, String toString)
    Appends to the `toString` another toString.

    NOTE: It assumes that the toString has been created from the same ToStringStyle.

    A `null` `toString` is ignored.

    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `toString` - the additional `toString`.
    Since:
      2.0

  - ### getArrayEnd

    protected String getArrayEnd()
    Gets the array end text.
    Returns:
      the current array end text.

  - ### getArraySeparator

    protected String getArraySeparator()
    Gets the array separator text.
    Returns:
      the current array separator text.

  - ### getArrayStart

    protected String getArrayStart()
    Gets the array start text.
    Returns:
      the current array start text.

  - ### getContentEnd

    protected String getContentEnd()
    Gets the content end text.
    Returns:
      the current content end text.

  - ### getContentStart

    protected String getContentStart()
    Gets the content start text.
    Returns:
      the current content start text.

  - ### getFieldNameValueSeparator

    protected String getFieldNameValueSeparator()
    Gets the field name value separator text.
    Returns:
      the current field name value separator text.

  - ### getFieldSeparator

    protected String getFieldSeparator()
    Gets the field separator text.
    Returns:
      the current field separator text.

  - ### getNullText

    protected String getNullText()
    Gets the text to output when `null` found.
    Returns:
      the current text to output when null found.

  - ### getShortClassName

    protected String getShortClassName(Class<?> cls)
    Gets the short class name for a class.

    The short class name is the class name excluding the package name.

    Parameters:
      `cls` - the `Class` to get the short name of.
    Returns:
      the short name.

  - ### getSizeEndText

    protected String getSizeEndText()
    Gets the end text to output when a `Collection`, `Map` or array size is output.

    This is output after the size value.

    Returns:
      the current end of size text.

  - ### getSizeStartText

    protected String getSizeStartText()
    Gets the start text to output when a `Collection`, `Map` or array size is output.

    This is output before the size value.

    Returns:
      the current start of size text.

  - ### getSummaryObjectEndText

    protected String getSummaryObjectEndText()
    Gets the end text to output when an `Object` is output in summary mode.

    This is output after the size value.

    Returns:
      the current end of summary text.

  - ### getSummaryObjectStartText

    protected String getSummaryObjectStartText()
    Gets the start text to output when an `Object` is output in summary mode.

    This is output before the size value.

    Returns:
      the current start of summary text.

  - ### isArrayContentDetail

    protected boolean isArrayContentDetail()
    Gets whether to output array content detail.
    Returns:
      the current array content detail setting.

  - ### isDefaultFullDetail

    protected boolean isDefaultFullDetail()
    Gets whether to use full detail when the caller doesn't specify.
    Returns:
      the current defaultFullDetail flag.

  - ### isFieldSeparatorAtEnd

    protected boolean isFieldSeparatorAtEnd()
    Gets whether the field separator should be added at the end of each buffer.
    Returns:
      fieldSeparatorAtEnd flag.
    Since:
      2.0

  - ### isFieldSeparatorAtStart

    protected boolean isFieldSeparatorAtStart()
    Gets whether the field separator should be added at the start of each buffer.
    Returns:
      the fieldSeparatorAtStart flag.
    Since:
      2.0

  - ### isFullDetail

    protected boolean isFullDetail(Boolean fullDetailRequest)
    Is this field to be output in full detail.

    This method converts a detail request into a detail level. The calling code may request full detail (`true`), but a subclass might ignore that and always return `false`. The calling code may pass in `null` indicating that it doesn't care about the detail level. In this case the default detail level is used.

    Parameters:
      `fullDetailRequest` - the detail level requested.
    Returns:
      whether full detail is to be shown.

  - ### isUseClassName

    protected boolean isUseClassName()
    Gets whether to use the class name.
    Returns:
      the current useClassName flag.

  - ### isUseFieldNames

    protected boolean isUseFieldNames()
    Gets whether to use the field names passed in.
    Returns:
      the current useFieldNames flag.

  - ### isUseIdentityHashCode

    protected boolean isUseIdentityHashCode()
    Gets whether to use the identity hash code.
    Returns:
      the current useIdentityHashCode flag.

  - ### isUseShortClassName

    protected boolean isUseShortClassName()
    Gets whether to output short or long class names.
    Returns:
      the current useShortClassName flag.
    Since:
      2.0

  - ### reflectionAppendArrayDetail

    protected void reflectionAppendArrayDetail(StringBuffer buffer, String fieldName, Object array)
    Appends to the `toString` the detail of an array type.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
      `fieldName` - the field name, typically not used as already appended.
      `array` - the array to add to the `toString`, not `null`.
    Since:
      2.0

  - ### removeLastFieldSeparator

    protected void removeLastFieldSeparator(StringBuffer buffer)
    Remove the last field separator from the buffer.
    Parameters:
      `buffer` - the `StringBuffer` to populate.
    Since:
      2.0

  - ### setArrayContentDetail

    protected void setArrayContentDetail(boolean arrayContentDetail)
    Sets whether to output array content detail.
    Parameters:
      `arrayContentDetail` - the new arrayContentDetail flag.

  - ### setArrayEnd

    protected void setArrayEnd(String arrayEnd)
    Sets the array end text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `arrayEnd` - the new array end text.

  - ### setArraySeparator

    protected void setArraySeparator(String arraySeparator)
    Sets the array separator text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `arraySeparator` - the new array separator text.

  - ### setArrayStart

    protected void setArrayStart(String arrayStart)
    Sets the array start text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `arrayStart` - the new array start text.

  - ### setContentEnd

    protected void setContentEnd(String contentEnd)
    Sets the content end text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `contentEnd` - the new content end text.

  - ### setContentStart

    protected void setContentStart(String contentStart)
    Sets the content start text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `contentStart` - the new content start text.

  - ### setDefaultFullDetail

    protected void setDefaultFullDetail(boolean defaultFullDetail)
    Sets whether to use full detail when the caller doesn't specify.
    Parameters:
      `defaultFullDetail` - the new defaultFullDetail flag.

  - ### setFieldNameValueSeparator

    protected void setFieldNameValueSeparator(String fieldNameValueSeparator)
    Sets the field name value separator text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `fieldNameValueSeparator` - the new field name value separator text.

  - ### setFieldSeparator

    protected void setFieldSeparator(String fieldSeparator)
    Sets the field separator text.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `fieldSeparator` - the new field separator text.

  - ### setFieldSeparatorAtEnd

    protected void setFieldSeparatorAtEnd(boolean fieldSeparatorAtEnd)
    Sets whether the field separator should be added at the end of each buffer.
    Parameters:
      `fieldSeparatorAtEnd` - the fieldSeparatorAtEnd flag.
    Since:
      2.0

  - ### setFieldSeparatorAtStart

    protected void setFieldSeparatorAtStart(boolean fieldSeparatorAtStart)
    Sets whether the field separator should be added at the start of each buffer.
    Parameters:
      `fieldSeparatorAtStart` - the fieldSeparatorAtStart flag.
    Since:
      2.0

  - ### setNullText

    protected void setNullText(String nullText)
    Sets the text to output when `null` found.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `nullText` - the new text to output when null found.

  - ### setSizeEndText

    protected void setSizeEndText(String sizeEndText)
    Sets the end text to output when a `Collection`, `Map` or array size is output.

    This is output after the size value.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `sizeEndText` - the new end of size text.

  - ### setSizeStartText

    protected void setSizeStartText(String sizeStartText)
    Sets the start text to output when a `Collection`, `Map` or array size is output.

    This is output before the size value.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `sizeStartText` - the new start of size text.

  - ### setSummaryObjectEndText

    protected void setSummaryObjectEndText(String summaryObjectEndText)
    Sets the end text to output when an `Object` is output in summary mode.

    This is output after the size value.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `summaryObjectEndText` - the new end of summary text.

  - ### setSummaryObjectStartText

    protected void setSummaryObjectStartText(String summaryObjectStartText)
    Sets the start text to output when an `Object` is output in summary mode.

    This is output before the size value.

    `null` is accepted, but will be converted to an empty String.

    Parameters:
      `summaryObjectStartText` - the new start of summary text.

  - ### setUseClassName

    protected void setUseClassName(boolean useClassName)
    Sets whether to use the class name.
    Parameters:
      `useClassName` - the new useClassName flag.

  - ### setUseFieldNames

    protected void setUseFieldNames(boolean useFieldNames)
    Sets whether to use the field names passed in.
    Parameters:
      `useFieldNames` - the new useFieldNames flag.

  - ### setUseIdentityHashCode

    protected void setUseIdentityHashCode(boolean useIdentityHashCode)
    Sets whether to use the identity hash code.
    Parameters:
      `useIdentityHashCode` - the new useIdentityHashCode flag.

  - ### setUseShortClassName

    protected void setUseShortClassName(boolean useShortClassName)
    Sets whether to output short or long class names.
    Parameters:
      `useShortClassName` - the new useShortClassName flag.
    Since:
      2.0