ObjectUtils (Apache Commons Lang 3.12.0 API)

java.lang.Object
- org.apache.commons.lang3.ObjectUtils

```
public class ObjectUtils
extends Object
```
Operations on Object.

This class tries to handle null input gracefully. An exception will generally not be thrown for a null input. Each method documents its behavior in more detail.

#ThreadSafe#

Since:

1.0

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ObjectUtils.Null
Class used as a null placeholder where null has another meaning.

Nested Classes
Modifier and Type	Class and Description
`static class`	`ObjectUtils.Null` Class used as a null placeholder where `null` has another meaning.

Field Summary

Fields
Modifier and Type Field and Description

static ObjectUtils.Null NULL
Singleton used as a null placeholder where null has another meaning.

Fields
Modifier and Type	Field and Description
`static ObjectUtils.Null`	`NULL` Singleton used as a `null` placeholder where `null` has another meaning.

Constructor Summary

Constructors
Constructor and Description

ObjectUtils()
ObjectUtils instances should NOT be constructed in standard programming.

Constructors
Constructor and Description
`ObjectUtils()` `ObjectUtils` instances should NOT be constructed in standard programming.

Method Summary

All Methods Static Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static boolean`	`allNotNull(Object... values)` Checks if all values in the array are not `nulls`.
`static boolean`	`allNull(Object... values)` Checks if all values in the given array are `null`.
`static boolean`	`anyNotNull(Object... values)` Checks if any value in the given array is not `null`.
`static boolean`	`anyNull(Object... values)` Checks if any value in the given array is `null`.
`static <T> T`	`clone(T obj)` Clone an object.
`static <T> T`	`cloneIfPossible(T obj)` Clone an object if possible.
`static <T extends Comparable<? super T>> int`	`compare(T c1, T c2)` Null safe comparison of Comparables.
`static <T extends Comparable<? super T>> int`	`compare(T c1, T c2, boolean nullGreater)` Null safe comparison of Comparables.
`static byte`	`CONST_BYTE(int v)` This method returns the provided value unchanged.
`static short`	`CONST_SHORT(int v)` This method returns the provided value unchanged.
`static boolean`	`CONST(boolean v)` This method returns the provided value unchanged.
`static byte`	`CONST(byte v)` This method returns the provided value unchanged.
`static char`	`CONST(char v)` This method returns the provided value unchanged.
`static double`	`CONST(double v)` This method returns the provided value unchanged.
`static float`	`CONST(float v)` This method returns the provided value unchanged.
`static int`	`CONST(int v)` This method returns the provided value unchanged.
`static long`	`CONST(long v)` This method returns the provided value unchanged.
`static short`	`CONST(short v)` This method returns the provided value unchanged.
`static <T> T`	`CONST(T v)` This method returns the provided value unchanged.
`static <T> T`	`defaultIfNull(T object, T defaultValue)` Returns a default value if the object passed is `null`.
`static boolean`	`equals(Object object1, Object object2)` Deprecated. this method has been replaced by `java.util.Objects.equals(Object, Object)` in Java 7 and will be removed from future releases.
`static <T> T`	`firstNonNull(T... values)` Returns the first value in the array which is not `null`.
`static <T> T`	`getFirstNonNull(Supplier<T>... suppliers)` Executes the given suppliers in order and returns the first return value where a value other than `null` is returned.
`static <T> T`	`getIfNull(T object, Supplier<T> defaultSupplier)` Returns the given `object` is it is non-null, otherwise returns the Supplier's `Supplier.get()` value.
`static int`	`hashCode(Object obj)` Deprecated. this method has been replaced by `java.util.Objects.hashCode(Object)` in Java 7 and will be removed in future releases
`static int`	`hashCodeMulti(Object... objects)` Deprecated. this method has been replaced by `java.util.Objects.hash(Object...)` in Java 7 and will be removed in future releases.
`static void`	`identityToString(Appendable appendable, Object object)` Appends the toString that would be produced by `Object` if a class did not override toString itself.
`static String`	`identityToString(Object object)` Gets the toString that would be produced by `Object` if a class did not override toString itself.
`static void`	`identityToString(StrBuilder builder, Object object)` Deprecated. as of 3.6, because StrBuilder was moved to commons-text, use one of the other `identityToString` methods instead
`static void`	`identityToString(StringBuffer buffer, Object object)` Appends the toString that would be produced by `Object` if a class did not override toString itself.
`static void`	`identityToString(StringBuilder builder, Object object)` Appends the toString that would be produced by `Object` if a class did not override toString itself.
`static boolean`	`isEmpty(Object object)` Checks if an Object is empty or null.
`static boolean`	`isNotEmpty(Object object)` Checks if an Object is not empty and not null.
`static <T extends Comparable<? super T>> T`	`max(T... values)` Null safe comparison of Comparables.
`static <T> T`	`median(Comparator<T> comparator, T... items)` Find the "best guess" middle value among comparables.
`static <T extends Comparable<? super T>> T`	`median(T... items)` Find the "best guess" middle value among comparables.
`static <T extends Comparable<? super T>> T`	`min(T... values)` Null safe comparison of Comparables.
`static <T> T`	`mode(T... items)` Find the most frequently occurring item.
`static boolean`	`notEqual(Object object1, Object object2)` Compares two objects for inequality, where either one or both objects may be `null`.
`static <T> T`	`requireNonEmpty(T obj)` Checks that the specified object reference is not `null` or empty per `isEmpty(Object)`.
`static <T> T`	`requireNonEmpty(T obj, String message)` Checks that the specified object reference is not `null` or empty per `isEmpty(Object)`.
`static String`	`toString(Object obj)` Deprecated. this method has been replaced by `java.util.Objects.toString(Object)` in Java 7 and will be removed in future releases. Note however that said method will return "null" for null references, while this method returns an empty String. To preserve behavior use `java.util.Objects.toString(myObject, "")`
`static String`	`toString(Object obj, String nullStr)` Deprecated. this method has been replaced by `java.util.Objects.toString(Object, String)` in Java 7 and will be removed in future releases.
`static String`	`toString(Object obj, Supplier<String> supplier)` Gets the `toString` of an `Object` returning a specified text if `null` input.
`static void`	`wait(Object obj, Duration duration)` Calls `Object.wait(long, int)` for the given Duration.

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

- Field Detail
  - NULL
```
public static final ObjectUtils.Null NULL
```
    Singleton used as a null placeholder where null has another meaning.
    
    For example, in a HashMap the HashMap.get(java.lang.Object) method returns null if the Map contains null or if there is no matching key. The Null placeholder can be used to distinguish between these two cases.
    
    Another example is Hashtable, where null cannot be stored.
    
    This instance is Serializable.
- Constructor Detail
  - ObjectUtils
```
public ObjectUtils()
```
    ObjectUtils instances should NOT be constructed in standard programming. Instead, the static methods on the class should be used, such as ObjectUtils.defaultIfNull("a","b");.
    
    This constructor is public to permit tools that require a JavaBean instance to operate.
- Method Detail
  - allNotNull
```
public static boolean allNotNull(Object... values)
```
    Checks if all values in the array are not nulls.
    If any value is null or the array is null then false is returned. If all elements in array are not null or the array is empty (contains no elements) true is returned.
```
 ObjectUtils.allNotNull(*)             = true
 ObjectUtils.allNotNull(*, *)          = true
 ObjectUtils.allNotNull(null)          = false
 ObjectUtils.allNotNull(null, null)    = false
 ObjectUtils.allNotNull(null, *)       = false
 ObjectUtils.allNotNull(*, null)       = false
 ObjectUtils.allNotNull(*, *, null, *) = false
 
```
    Parameters:
    
    values - the values to test, may be null or empty
    
    Returns:
    
    false if there is at least one null value in the array or the array is null, true if all values in the array are not nulls or array contains no elements.
    
    Since:
    
    3.5
  - allNull
```
public static boolean allNull(Object... values)
```
    Checks if all values in the given array are null.
    If all the values are null or the array is null or empty, then true is returned, otherwise false is returned.
```
 ObjectUtils.allNull(*)                = false
 ObjectUtils.allNull(*, null)          = false
 ObjectUtils.allNull(null, *)          = false
 ObjectUtils.allNull(null, null, *, *) = false
 ObjectUtils.allNull(null)             = true
 ObjectUtils.allNull(null, null)       = true
 
```
    Parameters:
    
    values - the values to test, may be null or empty
    
    Returns:
    
    true if all values in the array are nulls, false if there is at least one non-null value in the array.
    
    Since:
    
    3.11
  - anyNotNull
```
public static boolean anyNotNull(Object... values)
```
    Checks if any value in the given array is not null.
    If all the values are null or the array is null or empty then false is returned. Otherwise true is returned.
```
 ObjectUtils.anyNotNull(*)                = true
 ObjectUtils.anyNotNull(*, null)          = true
 ObjectUtils.anyNotNull(null, *)          = true
 ObjectUtils.anyNotNull(null, null, *, *) = true
 ObjectUtils.anyNotNull(null)             = false
 ObjectUtils.anyNotNull(null, null)       = false
 
```
    Parameters:
    
    values - the values to test, may be null or empty
    
    Returns:
    
    true if there is at least one non-null value in the array, false if all values in the array are nulls. If the array is null or empty false is also returned.
    
    Since:
    
    3.5
  - anyNull
```
public static boolean anyNull(Object... values)
```
    Checks if any value in the given array is null.
    If any of the values are null or the array is null, then true is returned, otherwise false is returned.
```
 ObjectUtils.anyNull(*)             = false
 ObjectUtils.anyNull(*, *)          = false
 ObjectUtils.anyNull(null)          = true
 ObjectUtils.anyNull(null, null)    = true
 ObjectUtils.anyNull(null, *)       = true
 ObjectUtils.anyNull(*, null)       = true
 ObjectUtils.anyNull(*, *, null, *) = true
 
```
    Parameters:
    
    values - the values to test, may be null or empty
    
    Returns:
    
    true if there is at least one null value in the array, false if all the values are non-null. If the array is null or empty, true is also returned.
    
    Since:
    
    3.11
  - clone
```
public static <T> T clone(T obj)
```
    Clone an object.
    
    Type Parameters:
    
    T - the type of the object
    
    Parameters:
    
    obj - the object to clone, null returns null
    
    Returns:
    
    the clone if the object implements Cloneable otherwise null
    
    Throws:
    
    CloneFailedException - if the object is cloneable and the clone operation fails
    
    Since:
    
    3.0
  - cloneIfPossible
```
public static <T> T cloneIfPossible(T obj)
```
    Clone an object if possible.
    
    This method is similar to clone(Object), but will return the provided instance as the return value instead of null if the instance is not cloneable. This is more convenient if the caller uses different implementations (e.g. of a service) and some of the implementations do not allow concurrent processing or have state. In such cases the implementation can simply provide a proper clone implementation and the caller's code does not have to change.
    
    Type Parameters:
    
    T - the type of the object
    
    Parameters:
    
    obj - the object to clone, null returns null
    
    Returns:
    
    the clone if the object implements Cloneable otherwise the object itself
    
    Throws:
    
    CloneFailedException - if the object is cloneable and the clone operation fails
    
    Since:
    
    3.0
  - compare
```
public static <T extends Comparable<? super T>> int compare(T c1,
                                                            T c2)
```
    Null safe comparison of Comparables. null is assumed to be less than a non-null value.
    
    Type Parameters:
    
    T - type of the values processed by this method
    
    Parameters:
    
    c1 - the first comparable, may be null
    
    c2 - the second comparable, may be null
    
    Returns:
    
    a negative value if c1 < c2, zero if c1 = c2 and a positive value if c1 > c2
  - compare
```
public static <T extends Comparable<? super T>> int compare(T c1,
                                                            T c2,
                                                            boolean nullGreater)
```
    Null safe comparison of Comparables.
    
    Type Parameters:
    
    T - type of the values processed by this method
    
    Parameters:
    
    c1 - the first comparable, may be null
    
    c2 - the second comparable, may be null
    
    nullGreater - if true null is considered greater than a non-null value or if false null is considered less than a Non-null value
    
    Returns:
    
    a negative value if c1 < c2, zero if c1 = c2 and a positive value if c1 > c2
    
    See Also:
    
    Comparator.compare(Object, Object)
  - CONST
```
public static boolean CONST(boolean v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static boolean MAGIC_FLAG = ObjectUtils.CONST(true);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the boolean value to return
    
    Returns:
    
    the boolean v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static byte CONST(byte v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static byte MAGIC_BYTE = ObjectUtils.CONST((byte) 127);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the byte value to return
    
    Returns:
    
    the byte v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static char CONST(char v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static char MAGIC_CHAR = ObjectUtils.CONST('a');
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the char value to return
    
    Returns:
    
    the char v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static double CONST(double v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static double MAGIC_DOUBLE = ObjectUtils.CONST(1.0);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the double value to return
    
    Returns:
    
    the double v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static float CONST(float v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static float MAGIC_FLOAT = ObjectUtils.CONST(1.0f);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the float value to return
    
    Returns:
    
    the float v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static int CONST(int v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static int MAGIC_INT = ObjectUtils.CONST(123);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the int value to return
    
    Returns:
    
    the int v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static long CONST(long v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static long MAGIC_LONG = ObjectUtils.CONST(123L);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the long value to return
    
    Returns:
    
    the long v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static short CONST(short v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static short MAGIC_SHORT = ObjectUtils.CONST((short) 123);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the short value to return
    
    Returns:
    
    the short v, unchanged
    
    Since:
    
    3.2
  - CONST
```
public static <T> T CONST(T v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static String MAGIC_STRING = ObjectUtils.CONST("abc");
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Type Parameters:
    
    T - the Object type
    
    Parameters:
    
    v - the genericized Object value to return (typically a String).
    
    Returns:
    
    the genericized Object v, unchanged (typically a String).
    
    Since:
    
    3.2
  - CONST_BYTE
```
public static byte CONST_BYTE(int v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static byte MAGIC_BYTE = ObjectUtils.CONST_BYTE(127);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the byte literal (as an int) value to return
    
    Returns:
    
    the byte v, unchanged
    
    Throws:
    
    IllegalArgumentException - if the value passed to v is larger than a byte, that is, smaller than -128 or larger than 127.
    
    Since:
    
    3.2
  - CONST_SHORT
```
public static short CONST_SHORT(int v)
```
    This method returns the provided value unchanged. This can prevent javac from inlining a constant field, e.g.,
```
     public final static short MAGIC_SHORT = ObjectUtils.CONST_SHORT(127);
 
```
    This way any jars that refer to this field do not have to recompile themselves if the field's value changes at some future date.
    Parameters:
    
    v - the short literal (as an int) value to return
    
    Returns:
    
    the byte v, unchanged
    
    Throws:
    
    IllegalArgumentException - if the value passed to v is larger than a short, that is, smaller than -32768 or larger than 32767.
    
    Since:
    
    3.2
  - defaultIfNull
```
public static <T> T defaultIfNull(T object,
                                  T defaultValue)
```
    Returns a default value if the object passed is null.
```
 ObjectUtils.defaultIfNull(null, null)      = null
 ObjectUtils.defaultIfNull(null, "")        = ""
 ObjectUtils.defaultIfNull(null, "zz")      = "zz"
 ObjectUtils.defaultIfNull("abc", *)        = "abc"
 ObjectUtils.defaultIfNull(Boolean.TRUE, *) = Boolean.TRUE
 
```
    Type Parameters:
    
    T - the type of the object
    
    Parameters:
    
    object - the Object to test, may be null
    
    defaultValue - the default value to return, may be null
    
    Returns:
    
    object if it is not null, defaultValue otherwise TODO Rename to getIfNull in 4.0
  - equals
```
@Deprecated
public static boolean equals(Object object1,
                                         Object object2)
```
    Deprecated. this method has been replaced by java.util.Objects.equals(Object, Object) in Java 7 and will be removed from future releases.
    Compares two objects for equality, where either one or both objects may be null.
```
 ObjectUtils.equals(null, null)                  = true
 ObjectUtils.equals(null, "")                    = false
 ObjectUtils.equals("", null)                    = false
 ObjectUtils.equals("", "")                      = true
 ObjectUtils.equals(Boolean.TRUE, null)          = false
 ObjectUtils.equals(Boolean.TRUE, "true")        = false
 ObjectUtils.equals(Boolean.TRUE, Boolean.TRUE)  = true
 ObjectUtils.equals(Boolean.TRUE, Boolean.FALSE) = false
 
```
    Parameters:
    
    object1 - the first object, may be null
    
    object2 - the second object, may be null
    
    Returns:
    
    true if the values of both objects are the same
  - firstNonNull
```
@SafeVarargs
public static <T> T firstNonNull(T... values)
```
    Returns the first value in the array which is not null. If all the values are null or the array is null or empty then null is returned.
```
 ObjectUtils.firstNonNull(null, null)      = null
 ObjectUtils.firstNonNull(null, "")        = ""
 ObjectUtils.firstNonNull(null, null, "")  = ""
 ObjectUtils.firstNonNull(null, "zz")      = "zz"
 ObjectUtils.firstNonNull("abc", *)        = "abc"
 ObjectUtils.firstNonNull(null, "xyz", *)  = "xyz"
 ObjectUtils.firstNonNull(Boolean.TRUE, *) = Boolean.TRUE
 ObjectUtils.firstNonNull()                = null
 
```
    Type Parameters:
    
    T - the component type of the array
    
    Parameters:
    
    values - the values to test, may be null or empty
    
    Returns:
    
    the first value from values which is not null, or null if there are no non-null values
    
    Since:
    
    3.0
  - getFirstNonNull
```
@SafeVarargs
public static <T> T getFirstNonNull(Supplier<T>... suppliers)
```
    Executes the given suppliers in order and returns the first return value where a value other than null is returned. Once a non-null value is obtained, all following suppliers are not executed anymore. If all the return values are null or no suppliers are provided then null is returned.
```
 ObjectUtils.firstNonNullLazy(null, () -> null) = null
 ObjectUtils.firstNonNullLazy(() -> null, () -> "") = ""
 ObjectUtils.firstNonNullLazy(() -> "", () -> throw new IllegalStateException()) = ""
 ObjectUtils.firstNonNullLazy(() -> null, () -> "zz) = "zz"
 ObjectUtils.firstNonNullLazy() = null
 
```
    Type Parameters:
    
    T - the type of the return values
    
    Parameters:
    
    suppliers - the suppliers returning the values to test. null values are ignored. Suppliers may return null or a value of type @{code T}
    
    Returns:
    
    the first return value from suppliers which is not null, or null if there are no non-null values
    
    Since:
    
    3.10
  - getIfNull
```
public static <T> T getIfNull(T object,
                              Supplier<T> defaultSupplier)
```
    Returns the given object is it is non-null, otherwise returns the Supplier's Supplier.get() value.
    
    The caller responsible for thread-safety and exception handling of default value supplier.
```
 ObjectUtils.getIfNull(null, () -> null)     = null
 ObjectUtils.getIfNull(null, null)              = null
 ObjectUtils.getIfNull(null, () -> "")       = ""
 ObjectUtils.getIfNull(null, () -> "zz")     = "zz"
 ObjectUtils.getIfNull("abc", *)                = "abc"
 ObjectUtils.getIfNull(Boolean.TRUE, *)         = Boolean.TRUE
 
```
    Type Parameters:
    
    T - the type of the object
    
    Parameters:
    
    object - the Object to test, may be null
    
    defaultSupplier - the default value to return, may be null
    
    Returns:
    
    object if it is not null, defaultValueSupplier.get() otherwise
    
    Since:
    
    3.10
  - hashCode
```
@Deprecated
public static int hashCode(Object obj)
```
    Deprecated. this method has been replaced by java.util.Objects.hashCode(Object) in Java 7 and will be removed in future releases
    Gets the hash code of an object returning zero when the object is null.
```
 ObjectUtils.hashCode(null)   = 0
 ObjectUtils.hashCode(obj)    = obj.hashCode()
 
```
    Parameters:
    
    obj - the object to obtain the hash code of, may be null
    
    Returns:
    
    the hash code of the object, or zero if null
    
    Since:
    
    2.1
  - hashCodeMulti
```
@Deprecated
public static int hashCodeMulti(Object... objects)
```
    Deprecated. this method has been replaced by java.util.Objects.hash(Object...) in Java 7 and will be removed in future releases.
    Gets the hash code for multiple objects.
    
    This allows a hash code to be rapidly calculated for a number of objects. The hash code for a single object is the not same as hashCode(Object). The hash code for multiple objects is the same as that calculated by an ArrayList containing the specified objects.
```
 ObjectUtils.hashCodeMulti()                 = 1
 ObjectUtils.hashCodeMulti((Object[]) null)  = 1
 ObjectUtils.hashCodeMulti(a)                = 31 + a.hashCode()
 ObjectUtils.hashCodeMulti(a,b)              = (31 + a.hashCode()) * 31 + b.hashCode()
 ObjectUtils.hashCodeMulti(a,b,c)            = ((31 + a.hashCode()) * 31 + b.hashCode()) * 31 + c.hashCode()
 
```
    Parameters:
    
    objects - the objects to obtain the hash code of, may be null
    
    Returns:
    
    the hash code of the objects, or zero if null
    
    Since:
    
    3.0
  - identityToString
```
public static void identityToString(Appendable appendable,
                                    Object object)
                             throws IOException
```
    Appends the toString that would be produced by Object if a class did not override toString itself. null will throw a NullPointerException for either of the two parameters.
```
 ObjectUtils.identityToString(appendable, "")            = appendable.append("java.lang.String@1e23"
 ObjectUtils.identityToString(appendable, Boolean.TRUE)  = appendable.append("java.lang.Boolean@7fa"
 ObjectUtils.identityToString(appendable, Boolean.TRUE)  = appendable.append("java.lang.Boolean@7fa")
 
```
    Parameters:
    
    appendable - the appendable to append to
    
    object - the object to create a toString for
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    Since:
    
    3.2
  - identityToString
```
public static String identityToString(Object object)
```
    Gets the toString that would be produced by Object if a class did not override toString itself. null will return null.
```
 ObjectUtils.identityToString(null)         = null
 ObjectUtils.identityToString("")           = "java.lang.String@1e23"
 ObjectUtils.identityToString(Boolean.TRUE) = "java.lang.Boolean@7fa"
 
```
    Parameters:
    
    object - the object to create a toString for, may be null
    
    Returns:
    
    the default toString text, or null if null passed in
  - identityToString
```
@Deprecated
public static void identityToString(StrBuilder builder,
                                                Object object)
```
    Deprecated. as of 3.6, because StrBuilder was moved to commons-text, use one of the other identityToString methods instead
    Appends the toString that would be produced by Object if a class did not override toString itself. null will throw a NullPointerException for either of the two parameters.
```
 ObjectUtils.identityToString(builder, "")            = builder.append("java.lang.String@1e23"
 ObjectUtils.identityToString(builder, Boolean.TRUE)  = builder.append("java.lang.Boolean@7fa"
 ObjectUtils.identityToString(builder, Boolean.TRUE)  = builder.append("java.lang.Boolean@7fa")
 
```
    Parameters:
    
    builder - the builder to append to
    
    object - the object to create a toString for
    
    Since:
    
    3.2
  - identityToString
```
public static void identityToString(StringBuffer buffer,
                                    Object object)
```
    Appends the toString that would be produced by Object if a class did not override toString itself. null will throw a NullPointerException for either of the two parameters.
```
 ObjectUtils.identityToString(buf, "")            = buf.append("java.lang.String@1e23"
 ObjectUtils.identityToString(buf, Boolean.TRUE)  = buf.append("java.lang.Boolean@7fa"
 ObjectUtils.identityToString(buf, Boolean.TRUE)  = buf.append("java.lang.Boolean@7fa")
 
```
    Parameters:
    
    buffer - the buffer to append to
    
    object - the object to create a toString for
    
    Since:
    
    2.4
  - identityToString
```
public static void identityToString(StringBuilder builder,
                                    Object object)
```
    Appends the toString that would be produced by Object if a class did not override toString itself. null will throw a NullPointerException for either of the two parameters.
```
 ObjectUtils.identityToString(builder, "")            = builder.append("java.lang.String@1e23"
 ObjectUtils.identityToString(builder, Boolean.TRUE)  = builder.append("java.lang.Boolean@7fa"
 ObjectUtils.identityToString(builder, Boolean.TRUE)  = builder.append("java.lang.Boolean@7fa")
 
```
    Parameters:
    
    builder - the builder to append to
    
    object - the object to create a toString for
    
    Since:
    
    3.2
  - isEmpty
```
public static boolean isEmpty(Object object)
```
    Checks if an Object is empty or null.
    The following types are supported:
    - CharSequence: Considered empty if its length is zero.
    - Array: Considered empty if its length is zero.
    - Collection: Considered empty if it has zero elements.
    - Map: Considered empty if it has zero key-value mappings.
```
 ObjectUtils.isEmpty(null)             = true
 ObjectUtils.isEmpty("")               = true
 ObjectUtils.isEmpty("ab")             = false
 ObjectUtils.isEmpty(new int[]{})      = true
 ObjectUtils.isEmpty(new int[]{1,2,3}) = false
 ObjectUtils.isEmpty(1234)             = false
 
```
    Parameters:
    
    object - the Object to test, may be null
    
    Returns:
    
    true if the object has a supported type and is empty or null, false otherwise
    
    Since:
    
    3.9
  - isNotEmpty
```
public static boolean isNotEmpty(Object object)
```
    Checks if an Object is not empty and not null.
    The following types are supported:
    - CharSequence: Considered empty if its length is zero.
    - Array: Considered empty if its length is zero.
    - Collection: Considered empty if it has zero elements.
    - Map: Considered empty if it has zero key-value mappings.
```
 ObjectUtils.isNotEmpty(null)             = false
 ObjectUtils.isNotEmpty("")               = false
 ObjectUtils.isNotEmpty("ab")             = true
 ObjectUtils.isNotEmpty(new int[]{})      = false
 ObjectUtils.isNotEmpty(new int[]{1,2,3}) = true
 ObjectUtils.isNotEmpty(1234)             = true
 
```
    Parameters:
    
    object - the Object to test, may be null
    
    Returns:
    
    true if the object has an unsupported type or is not empty and not null, false otherwise
    
    Since:
    
    3.9
  - max
```
@SafeVarargs
public static <T extends Comparable<? super T>> T max(T... values)
```
    Null safe comparison of Comparables.
    Type Parameters:
    
    T - type of the values processed by this method
    
    Parameters:
    
    values - the set of comparable values, may be null
    
    Returns:
    If any objects are non-null and unequal, the greater object.
    If all objects are non-null and equal, the first.
    If any of the comparables are null, the greater of the non-null objects.
    If all the comparables are null, null is returned.
  - median
```
@SafeVarargs
public static <T> T median(Comparator<T> comparator,
                                        T... items)
```
    Find the "best guess" middle value among comparables. If there is an even number of total values, the lower of the two middle values will be returned.
    
    Type Parameters:
    
    T - type of values processed by this method
    
    Parameters:
    
    comparator - to use for comparisons
    
    items - to compare
    
    Returns:
    
    T at middle position
    
    Throws:
    
    NullPointerException - if items or comparator is null
    
    IllegalArgumentException - if items is empty or contains null values
    
    Since:
    
    3.0.1
  - median
```
@SafeVarargs
public static <T extends Comparable<? super T>> T median(T... items)
```
    Find the "best guess" middle value among comparables. If there is an even number of total values, the lower of the two middle values will be returned.
    
    Type Parameters:
    
    T - type of values processed by this method
    
    Parameters:
    
    items - to compare
    
    Returns:
    
    T at middle position
    
    Throws:
    
    NullPointerException - if items is null
    
    IllegalArgumentException - if items is empty or contains null values
    
    Since:
    
    3.0.1
  - min
```
@SafeVarargs
public static <T extends Comparable<? super T>> T min(T... values)
```
    Null safe comparison of Comparables.
    Type Parameters:
    
    T - type of the values processed by this method
    
    Parameters:
    
    values - the set of comparable values, may be null
    
    Returns:
    If any objects are non-null and unequal, the lesser object.
    If all objects are non-null and equal, the first.
    If any of the comparables are null, the lesser of the non-null objects.
    If all the comparables are null, null is returned.
  - mode
```
@SafeVarargs
public static <T> T mode(T... items)
```
    Find the most frequently occurring item.
    
    Type Parameters:
    
    T - type of values processed by this method
    
    Parameters:
    
    items - to check
    
    Returns:
    
    most populous T, null if non-unique or no items supplied
    
    Since:
    
    3.0.1
  - notEqual
```
public static boolean notEqual(Object object1,
                               Object object2)
```
    Compares two objects for inequality, where either one or both objects may be null.
```
 ObjectUtils.notEqual(null, null)                  = false
 ObjectUtils.notEqual(null, "")                    = true
 ObjectUtils.notEqual("", null)                    = true
 ObjectUtils.notEqual("", "")                      = false
 ObjectUtils.notEqual(Boolean.TRUE, null)          = true
 ObjectUtils.notEqual(Boolean.TRUE, "true")        = true
 ObjectUtils.notEqual(Boolean.TRUE, Boolean.TRUE)  = false
 ObjectUtils.notEqual(Boolean.TRUE, Boolean.FALSE) = true
 
```
    Parameters:
    
    object1 - the first object, may be null
    
    object2 - the second object, may be null
    
    Returns:
    
    false if the values of both objects are the same
  - requireNonEmpty
```
public static <T> T requireNonEmpty(T obj)
```
    Checks that the specified object reference is not null or empty per isEmpty(Object). Use this method for validation, for example:
    public Foo(Bar bar) { this.bar = Objects.requireNonEmpty(bar); }
    Type Parameters:
    
    T - the type of the reference.
    
    Parameters:
    
    obj - the object reference to check for nullity.
    
    Returns:
    
    obj if not null.
    
    Throws:
    
    NullPointerException - if obj is null.
    
    IllegalArgumentException - if obj is empty per isEmpty(Object).
    
    Since:
    
    3.12.0
    
    See Also:
    
    isEmpty(Object)
  - requireNonEmpty
```
public static <T> T requireNonEmpty(T obj,
                                    String message)
```
    Checks that the specified object reference is not null or empty per isEmpty(Object). Use this method for validation, for example:
    public Foo(Bar bar) { this.bar = Objects.requireNonEmpty(bar, "bar"); }
    Type Parameters:
    
    T - the type of the reference.
    
    Parameters:
    
    obj - the object reference to check for nullity.
    
    message - the exception message.
    
    Returns:
    
    obj if not null.
    
    Throws:
    
    NullPointerException - if obj is null.
    
    IllegalArgumentException - if obj is empty per isEmpty(Object).
    
    Since:
    
    3.12.0
    
    See Also:
    
    isEmpty(Object)
  - toString
```
@Deprecated
public static String toString(Object obj)
```
    Deprecated. this method has been replaced by java.util.Objects.toString(Object) in Java 7 and will be removed in future releases. Note however that said method will return "null" for null references, while this method returns an empty String. To preserve behavior use java.util.Objects.toString(myObject, "")
    Gets the toString of an Object returning an empty string ("") if null input.
```
 ObjectUtils.toString(null)         = ""
 ObjectUtils.toString("")           = ""
 ObjectUtils.toString("bat")        = "bat"
 ObjectUtils.toString(Boolean.TRUE) = "true"
 
```
    Parameters:
    
    obj - the Object to toString, may be null
    
    Returns:
    
    the passed in Object's toString, or "" if null input
    
    Since:
    
    2.0
    
    See Also:
    
    StringUtils.defaultString(String), String.valueOf(Object)
  - toString
```
@Deprecated
public static String toString(Object obj,
                                          String nullStr)
```
    Deprecated. this method has been replaced by java.util.Objects.toString(Object, String) in Java 7 and will be removed in future releases.
    Gets the toString of an Object returning a specified text if null input.
```
 ObjectUtils.toString(null, null)           = null
 ObjectUtils.toString(null, "null")         = "null"
 ObjectUtils.toString("", "null")           = ""
 ObjectUtils.toString("bat", "null")        = "bat"
 ObjectUtils.toString(Boolean.TRUE, "null") = "true"
 
```
    Parameters:
    
    obj - the Object to toString, may be null
    
    nullStr - the String to return if null input, may be null
    
    Returns:
    
    the passed in Object's toString, or nullStr if null input
    
    Since:
    
    2.0
    
    See Also:
    
    StringUtils.defaultString(String,String), String.valueOf(Object)
  - toString
```
public static String toString(Object obj,
                              Supplier<String> supplier)
```
    Gets the toString of an Object returning a specified text if null input.
```
 ObjectUtils.toString(obj, () -> expensive())
 
```
```
 ObjectUtils.toString(null, () -> expensive())         = result of expensive()
 ObjectUtils.toString(null, () -> expensive())         = result of expensive()
 ObjectUtils.toString("", () -> expensive())           = ""
 ObjectUtils.toString("bat", () -> expensive())        = "bat"
 ObjectUtils.toString(Boolean.TRUE, () -> expensive()) = "true"
 
```
    Parameters:
    
    obj - the Object to toString, may be null
    
    supplier - the Supplier of String used on null input, may be null
    
    Returns:
    
    the passed in Object's toString, or nullStr if null input
    
    Since:
    
    3.11
  - wait
```
public static void wait(Object obj,
                        Duration duration)
                 throws InterruptedException
```
    Calls Object.wait(long, int) for the given Duration.
    
    Parameters:
    
    obj - The receiver of the wait call.
    
    duration - How long to wait.
    
    Throws:
    
    IllegalArgumentException - if the timeout duration is negative.
    
    IllegalMonitorStateException - if the current thread is not the owner of the obj's monitor.
    
    InterruptedException - if any thread interrupted the current thread before or while the current thread was waiting for a notification. The interrupted status of the current thread is cleared when this exception is thrown.
    
    Since:
    
    3.12.0
    
    See Also:
    
    Object.wait(long, int)

Class ObjectUtils

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NULL

Constructor Detail

ObjectUtils

Method Detail

allNotNull

allNull

anyNotNull

anyNull

clone

cloneIfPossible

compare

compare

CONST

CONST

CONST

CONST

CONST

CONST

CONST

CONST

CONST

CONST_BYTE

CONST_SHORT

defaultIfNull

equals

firstNonNull

getFirstNonNull

getIfNull

hashCode

hashCodeMulti

identityToString

identityToString

identityToString

identityToString

identityToString

isEmpty

isNotEmpty

max

median

median

min

mode

notEqual

requireNonEmpty

requireNonEmpty

toString

toString

toString

wait