Summary: Methods | Inherited Methods | [Expand All]

Added in API level 19

public final class

Objects

extends Object

java.lang.Object
↳	java.util.Objects

Class Overview

Utility methods for objects.

Summary

Public Methods
static <T> int	compare(T a, T b, Comparator<? super T> c) Returns 0 if `a == b`, or `c.compare(a, b)` otherwise.
static boolean	deepEquals(Object a, Object b) Returns true if both arguments are null, the result of `equals(boolean[], boolean[])` if both arguments are primitive arrays, the result of `deepEquals(Object[], Object[])` if both arguments are arrays of reference types, and the result of `equals(Object)` otherwise.
static boolean	equals(Object a, Object b) Null-safe equivalent of `a.equals(b)`.
static int	hash(Object... values) Convenience wrapper for `hashCode()`, adding varargs.
static int	hashCode(Object o) Returns 0 for null or `o.hashCode()`.
static <T> T	requireNonNull(T o, String message) Returns `o` if non-null, or throws `NullPointerException` with the given detail message.
static <T> T	requireNonNull(T o) Returns `o` if non-null, or throws `NullPointerException`.
static String	toString(Object o, String nullString) Returns `nullString` for null or `o.toString()`.
static String	toString(Object o) Returns "null" for null or `o.toString()`.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Methods

public static int compare (T a, T b, Comparator<? super T> c)

Added in API level 19

Returns 0 if a == b, or c.compare(a, b) otherwise. That is, this makes c null-safe.

public static boolean deepEquals (Object a, Object b)

Added in API level 19

Returns true if both arguments are null, the result of equals(boolean[], boolean[]) if both arguments are primitive arrays, the result of deepEquals(Object[], Object[]) if both arguments are arrays of reference types, and the result of equals(Object) otherwise.

public static boolean equals (Object a, Object b)

Added in API level 19

Null-safe equivalent of a.equals(b).

public static int hash (Object... values)

Added in API level 19

Convenience wrapper for hashCode(), adding varargs. This can be used to compute a hash code for an object's fields as follows: Objects.hash(a, b, c).

public static int hashCode (Object o)

Added in API level 19

Returns 0 for null or o.hashCode().

public static T requireNonNull (T o, String message)

Added in API level 19

Returns o if non-null, or throws NullPointerException with the given detail message.

public static T requireNonNull (T o)

Added in API level 19

Returns o if non-null, or throws NullPointerException.

public static String toString (Object o, String nullString)

Added in API level 19

Returns nullString for null or o.toString().

public static String toString (Object o)

Added in API level 19

Returns "null" for null or o.toString().

Results

Interfaces

Classes

Enums

Exceptions

Errors

Objects

Class Overview

Summary

Public Methods

public static int compare (T a, T b, Comparator<? super T> c)

public static boolean deepEquals (Object a, Object b)

public static boolean equals (Object a, Object b)

public static int hash (Object... values)

public static int hashCode (Object o)

public static T requireNonNull (T o, String message)

public static T requireNonNull (T o)

public static String toString (Object o, String nullString)

public static String toString (Object o)