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## org.apache.commons.lang.builder
Class ToStringBuilder

    java.lang.Object
      |
      +--org.apache.commons.lang.builder.ToStringBuilder

Direct Known Subclasses:
  ReflectionToStringBuilder

public class ToStringBuilder
extends Object

Assists in implementing `Object.toString()` methods.

This class enables a good and consistent `toString()` to be built for any class or object. This class aims to simplify the process by:

- allowing field names
- handling all types consistently
- handling nulls consistently
- outputting arrays and multi-dimensional arrays
- enabling the detail level to be controlled for Objects and Collections
- handling class hierarchies

To use this class write code as follows:

     public class Person {
       String name;
       int age;
       boolean smoker;

       ...

       public String toString() {
         return new ToStringBuilder(this).
           append("name", name).
           append("age", age).
           append("smoker", smoker).
           toString();
       }
     }

This will produce a toString of the format: `Person@7f54[name=Stephen,age=29,smoker=false]`

To add the superclass `toString`, use `appendSuper(java.lang.String)`. To append the `toString` from an object that is delegated to (or any other object), use `appendToString(java.lang.String)`.

Alternatively, there is a method that uses reflection to determine the fields to test. Because these fields are usually private, the method, `reflectionToString`, uses `AccessibleObject.setAccessible` to change the visibility of the fields. This will fail under a security manager, unless the appropriate permissions are set up correctly. It is also slower than testing explicitly.

A typical invocation for this method would look like:

     public String toString() {
       return ToStringBuilder.reflectionToString(this);
     }

You can also use the builder to debug 3rd party objects:

     System.out.println("An object: " + ToStringBuilder.reflectionToString(anObject));

The exact format of the `toString` is determined by the `ToStringStyle` passed into the constructor.

Since:
  1.0
Version:
  $Id: ToStringBuilder.java 492354 2007-01-03 23:48:10Z scolebourne $
Author:
  Stephen Colebourne, Gary Gregory, Pete Gieser

Constructor Summary
`ToStringBuilder(Object object)` Constructor for `ToStringBuilder`.
`ToStringBuilder(Object object, ToStringStyle style)` Constructor for `ToStringBuilder` specifying the output style.
`ToStringBuilder(Object object, ToStringStyle style, StringBuffer buffer)` Constructor for `ToStringBuilder`.

Method Summary
`ToStringBuilder` | `append(boolean value)` Append to the `toString` a `boolean` value.
`ToStringBuilder` | `append(boolean[] array)` Append to the `toString` a `boolean` array.
`ToStringBuilder` | `append(byte value)` Append to the `toString` a `byte` value.
`ToStringBuilder` | `append(byte[] array)` Append to the `toString` a `byte` array.
`ToStringBuilder` | `append(char value)` Append to the `toString` a `char` value.
`ToStringBuilder` | `append(char[] array)` Append to the `toString` a `char` array.
`ToStringBuilder` | `append(double value)` Append to the `toString` a `double` value.
`ToStringBuilder` | `append(double[] array)` Append to the `toString` a `double` array.
`ToStringBuilder` | `append(float value)` Append to the `toString` a `float` value.
`ToStringBuilder` | `append(float[] array)` Append to the `toString` a `float` array.
`ToStringBuilder` | `append(int value)` Append to the `toString` an `int` value.
`ToStringBuilder` | `append(int[] array)` Append to the `toString` an `int` array.
`ToStringBuilder` | `append(long value)` Append to the `toString` a `long` value.
`ToStringBuilder` | `append(long[] array)` Append to the `toString` a `long` array.
`ToStringBuilder` | `append(Object obj)` Append to the `toString` an `Object` value.
`ToStringBuilder` | `append(Object[] array)` Append to the `toString` an `Object` array.
`ToStringBuilder` | `append(short value)` Append to the `toString` a `short` value.
`ToStringBuilder` | `append(short[] array)` Append to the `toString` a `short` array.
`ToStringBuilder` | `append(String fieldName, boolean value)` Append to the `toString` a `boolean` value.
`ToStringBuilder` | `append(String fieldName, boolean[] array)` Append to the `toString` a `boolean` array.
`ToStringBuilder` | `append(String fieldName, boolean[] array, boolean fullDetail)` Append to the `toString` a `boolean` array.
`ToStringBuilder` | `append(String fieldName, byte value)` Append to the `toString` an `byte` value.
`ToStringBuilder` | `append(String fieldName, byte[] array)` Append to the `toString` a `byte` array.
`ToStringBuilder` | `append(String fieldName, byte[] array, boolean fullDetail)` Append to the `toString` a `byte` array.
`ToStringBuilder` | `append(String fieldName, char value)` Append to the `toString` a `char` value.
`ToStringBuilder` | `append(String fieldName, char[] array)` Append to the `toString` a `char` array.
`ToStringBuilder` | `append(String fieldName, char[] array, boolean fullDetail)` Append to the `toString` a `char` array.
`ToStringBuilder` | `append(String fieldName, double value)` Append to the `toString` a `double` value.
`ToStringBuilder` | `append(String fieldName, double[] array)` Append to the `toString` a `double` array.
`ToStringBuilder` | `append(String fieldName, double[] array, boolean fullDetail)` Append to the `toString` a `double` array.
`ToStringBuilder` | `append(String fieldName, float value)` Append to the `toString` an `float` value.
`ToStringBuilder` | `append(String fieldName, float[] array)` Append to the `toString` a `float` array.
`ToStringBuilder` | `append(String fieldName, float[] array, boolean fullDetail)` Append to the `toString` a `float` array.
`ToStringBuilder` | `append(String fieldName, int value)` Append to the `toString` an `int` value.
`ToStringBuilder` | `append(String fieldName, int[] array)` Append to the `toString` an `int` array.
`ToStringBuilder` | `append(String fieldName, int[] array, boolean fullDetail)` Append to the `toString` an `int` array.
`ToStringBuilder` | `append(String fieldName, long value)` Append to the `toString` a `long` value.
`ToStringBuilder` | `append(String fieldName, long[] array)` Append to the `toString` a `long` array.
`ToStringBuilder` | `append(String fieldName, long[] array, boolean fullDetail)` Append to the `toString` a `long` array.
`ToStringBuilder` | `append(String fieldName, Object obj)` Append to the `toString` an `Object` value.
`ToStringBuilder` | `append(String fieldName, Object[] array)` Append to the `toString` an `Object` array.
`ToStringBuilder` | `append(String fieldName, Object[] array, boolean fullDetail)` Append to the `toString` an `Object` array.
`ToStringBuilder` | `append(String fieldName, Object obj, boolean fullDetail)` Append to the `toString` an `Object` value.
`ToStringBuilder` | `append(String fieldName, short value)` Append to the `toString` an `short` value.
`ToStringBuilder` | `append(String fieldName, short[] array)` Append to the `toString` a `short` array.
`ToStringBuilder` | `append(String fieldName, short[] array, boolean fullDetail)` Append to the `toString` a `short` array.
`ToStringBuilder` | `appendAsObjectToString(Object object)` Appends with the same format as the default `Object toString()` method.
`ToStringBuilder` | `appendSuper(String superToString)` Append the `toString` from the superclass.
`ToStringBuilder` | `appendToString(String toString)` Append the `toString` from another object.
`static ToStringStyle` | `getDefaultStyle()` Gets the default `ToStringStyle` to use.
`Object` | `getObject()` Returns the `Object` being output.
`StringBuffer` | `getStringBuffer()` Gets the `StringBuffer` being populated.
`ToStringStyle` | `getStyle()` Gets the `ToStringStyle` being used.
`static String` | `reflectionToString(Object object)` Forwards to `ReflectionToStringBuilder`.
`static String` | `reflectionToString(Object object, ToStringStyle style)` Forwards to `ReflectionToStringBuilder`.
`static String` | `reflectionToString(Object object, ToStringStyle style, boolean outputTransients)` Forwards to `ReflectionToStringBuilder`.
`static String` | `reflectionToString(Object object, ToStringStyle style, boolean outputTransients, Class reflectUpToClass)` Forwards to `ReflectionToStringBuilder`.
`static void` | `setDefaultStyle(ToStringStyle style)` Sets the default `ToStringStyle` to use.
`String` | `toString()` Returns the built `toString`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### ToStringBuilder

    public ToStringBuilder(Object object)

  Constructor for `ToStringBuilder`.

  This constructor outputs using the default style set with `setDefaultStyle`.

  Parameters:
    `object` - the Object to build a `toString` for
  Throws:
    `IllegalArgumentException` - if the Object passed in is `null`

### ToStringBuilder

    public ToStringBuilder(Object object,
                           ToStringStyle style)

  Constructor for `ToStringBuilder` specifying the output style.

  If the style is `null`, the default style is used.

  Parameters:
    `object` - the Object to build a `toString` for
    `style` - the style of the `toString` to create, may be `null`
  Throws:
    `IllegalArgumentException` - if the Object passed in is `null`

### ToStringBuilder

    public ToStringBuilder(Object object,
                           ToStringStyle style,
                           StringBuffer buffer)

  Constructor for `ToStringBuilder`.

  If the style is `null`, the default style is used.

  If the buffer is `null`, a new one is created.

  Parameters:
    `object` - the Object to build a `toString` for
    `style` - the style of the `toString` to create, may be `null`
    `buffer` - the `StringBuffer` to populate, may be `null`

Method Detail

### getDefaultStyle

    public static ToStringStyle getDefaultStyle()

  Gets the default `ToStringStyle` to use.

  This could allow the `ToStringStyle` to be controlled for an entire application with one call.

  This might be used to have a verbose `ToStringStyle` during development and a compact `ToStringStyle` in production.

  Returns:
    the default `ToStringStyle`

### reflectionToString

    public static String reflectionToString(Object object)

  Forwards to `ReflectionToStringBuilder`.

  Parameters:
    `object` - the Object to be output
  Returns:
    the String result
  See Also:
    `ReflectionToStringBuilder.toString(Object)`

### reflectionToString

    public static String reflectionToString(Object object,
                                            ToStringStyle style)

  Forwards to `ReflectionToStringBuilder`.

  Parameters:
    `object` - the Object to be output
    `style` - the style of the `toString` to create, may be `null`
  Returns:
    the String result
  See Also:
    `ReflectionToStringBuilder.toString(Object,ToStringStyle)`

### reflectionToString

    public static String reflectionToString(Object object,
                                            ToStringStyle style,
                                            boolean outputTransients)

  Forwards to `ReflectionToStringBuilder`.

  Parameters:
    `object` - the Object to be output
    `style` - the style of the `toString` to create, may be `null`
    `outputTransients` - whether to include transient fields
  Returns:
    the String result
  See Also:
    `ReflectionToStringBuilder.toString(Object,ToStringStyle,boolean)`

### reflectionToString

    public static String reflectionToString(Object object,
                                            ToStringStyle style,
                                            boolean outputTransients,
                                            Class reflectUpToClass)

  Forwards to `ReflectionToStringBuilder`.

  Parameters:
    `object` - the Object to be output
    `style` - the style of the `toString` to create, may be `null`
    `outputTransients` - whether to include transient fields
    `reflectUpToClass` - the superclass to reflect up to (inclusive), may be `null`
  Returns:
    the String result
  Since:
    2.0
  See Also:
    `ReflectionToStringBuilder.toString(Object,ToStringStyle,boolean,boolean,Class)`

### setDefaultStyle

    public static void setDefaultStyle(ToStringStyle style)

  Sets the default `ToStringStyle` to use.

  Parameters:
    `style` - the default `ToStringStyle`
  Throws:
    `IllegalArgumentException` - if the style is `null`

### append

    public ToStringBuilder append(boolean value)

  Append to the `toString` a `boolean` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(boolean[] array)

  Append to the `toString` a `boolean` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(byte value)

  Append to the `toString` a `byte` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(byte[] array)

  Append to the `toString` a `byte` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(char value)

  Append to the `toString` a `char` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(char[] array)

  Append to the `toString` a `char` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(double value)

  Append to the `toString` a `double` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(double[] array)

  Append to the `toString` a `double` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(float value)

  Append to the `toString` a `float` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(float[] array)

  Append to the `toString` a `float` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(int value)

  Append to the `toString` an `int` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(int[] array)

  Append to the `toString` an `int` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(long value)

  Append to the `toString` a `long` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(long[] array)

  Append to the `toString` a `long` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(Object obj)

  Append to the `toString` an `Object` value.

  Parameters:
    `obj` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(Object[] array)

  Append to the `toString` an `Object` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(short value)

  Append to the `toString` a `short` value.

  Parameters:
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(short[] array)

  Append to the `toString` a `short` array.

  Parameters:
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  boolean value)

  Append to the `toString` a `boolean` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  boolean[] array)

  Append to the `toString` a `boolean` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `hashCode`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  boolean[] array,
                                  boolean fullDetail)

  Append to the `toString` a `boolean` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  byte value)

  Append to the `toString` an `byte` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  byte[] array)

  Append to the `toString` a `byte` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  byte[] array,
                                  boolean fullDetail)

  Append to the `toString` a `byte` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  char value)

  Append to the `toString` a `char` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  char[] array)

  Append to the `toString` a `char` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  char[] array,
                                  boolean fullDetail)

  Append to the `toString` a `char` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  double value)

  Append to the `toString` a `double` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  double[] array)

  Append to the `toString` a `double` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  double[] array,
                                  boolean fullDetail)

  Append to the `toString` a `double` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  float value)

  Append to the `toString` an `float` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  float[] array)

  Append to the `toString` a `float` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  float[] array,
                                  boolean fullDetail)

  Append to the `toString` a `float` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  int value)

  Append to the `toString` an `int` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  int[] array)

  Append to the `toString` an `int` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  int[] array,
                                  boolean fullDetail)

  Append to the `toString` an `int` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  long value)

  Append to the `toString` a `long` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  long[] array)

  Append to the `toString` a `long` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  long[] array,
                                  boolean fullDetail)

  Append to the `toString` a `long` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  Object obj)

  Append to the `toString` an `Object` value.

  Parameters:
    `fieldName` - the field name
    `obj` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  Object obj,
                                  boolean fullDetail)

  Append to the `toString` an `Object` value.

  Parameters:
    `fieldName` - the field name
    `obj` - the value to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  Object[] array)

  Append to the `toString` an `Object` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  Object[] array,
                                  boolean fullDetail)

  Append to the `toString` an `Object` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  short value)

  Append to the `toString` an `short` value.

  Parameters:
    `fieldName` - the field name
    `value` - the value to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  short[] array)

  Append to the `toString` a `short` array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
  Returns:
    this

### append

    public ToStringBuilder append(String fieldName,
                                  short[] array,
                                  boolean fullDetail)

  Append to the `toString` a `short` array.

  A boolean parameter controls the level of detail to show. Setting `true` will output the array in full. Setting `false` will output a summary, typically the size of the array.

  Parameters:
    `fieldName` - the field name
    `array` - the array to add to the `toString`
    `fullDetail` - `true` for detail, `false` for summary info
  Returns:
    this

### appendAsObjectToString

    public ToStringBuilder appendAsObjectToString(Object object)

  Appends with the same format as the default `Object toString()` method. Appends the class name followed by `System#identityHashCode(java.lang.Object)`.

  Parameters:
    `object` - the `Object` whose class name and id to output
  Returns:
    this
  Since:
    2.0

### appendSuper

    public ToStringBuilder appendSuper(String superToString)

  Append the `toString` from the superclass.

  This method assumes that the superclass uses the same `ToStringStyle` as this one.

  If `superToString` is `null`, no change is made.

  Parameters:
    `superToString` - the result of `super.toString()`
  Returns:
    this
  Since:
    2.0

### appendToString

    public ToStringBuilder appendToString(String toString)

  Append the `toString` from another object.

  This method is useful where a class delegates most of the implementation of its properties to another class. You can then call `toString()` on the other class and pass the result into this method.

         private AnotherObject delegate;
         private String fieldInThisClass;

         public String toString() {
           return new ToStringBuilder(this).
             appendToString(delegate.toString()).
             append(fieldInThisClass).
             toString();
         }

  This method assumes that the other object uses the same `ToStringStyle` as this one.

  If the `toString` is `null`, no change is made.

  Parameters:
    `toString` - the result of `toString()` on another object
  Returns:
    this
  Since:
    2.0

### getObject

    public Object getObject()

  Returns the `Object` being output.

  Returns:
    The object being output.
  Since:
    2.0

### getStringBuffer

    public StringBuffer getStringBuffer()

  Gets the `StringBuffer` being populated.

  Returns:
    the `StringBuffer` being populated

### getStyle

    public ToStringStyle getStyle()

  Gets the `ToStringStyle` being used.

  Returns:
    the `ToStringStyle` being used
  Since:
    2.0

### toString

    public String toString()

  Returns the built `toString`.

  This method appends the end of data indicator, and can only be called once. Use `getStringBuffer()` to get the current string state.

  If the object is `null`, return the style's `nullText`

  Overrides:
    `toString` in class `Object`
  Returns:
    the String `toString`

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