org.fest.util

Class Objects

java.lang.Object

org.fest.util.Objects

public final class Objects
extends java.lang.Object

Utility methods related to objects.

Author:

Alex Ruiz, Joel Costigliola

Field Summary

Fields

Modifier and Type	Field and Description
static int	HASH_CODE_PRIME Prime number used to calculate the hash code of objects.

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	areEqual(java.lang.Object o1, java.lang.Object o2) Returns true if the given objects are equal or if both objects are null.
static <T> T	castIfBelongsToType(java.lang.Object o, java.lang.Class<T> type) Casts the given object to the given type only if the object is of the given type.
static int	hashCodeFor(java.lang.Object o) Returns the hash code for the given object.
static java.lang.String[]	namesOf(java.lang.Class<?>... types) Returns an array containing the names of the given types.

Methods inherited from class java.lang.Object

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

Field Detail

HASH_CODE_PRIME

public static final int HASH_CODE_PRIME

Prime number used to calculate the hash code of objects.

See Also:

Constant Field Values

Method Detail

areEqual

public static boolean areEqual(java.lang.Object o1,
               java.lang.Object o2)

Returns true if the given objects are equal or if both objects are null.

Parameters:

o1 - one of the objects to compare.

o2 - one of the objects to compare.

Returns:

true if the given objects are equal or if both objects are null.

namesOf

public static java.lang.String[] namesOf(java.lang.Class<?>... types)

Returns an array containing the names of the given types.

Parameters:

types - the given types.

Returns:

the names of the given types stored in an array.

hashCodeFor

public static int hashCodeFor(java.lang.Object o)

Returns the hash code for the given object. If the object is null, this method returns zero. Otherwise calls the method hashCode of the given object.

Parameters:

o - the given object.

Returns:

the hash code for the given object

castIfBelongsToType

public static <T> T castIfBelongsToType(java.lang.Object o,
                        java.lang.Class<T> type)

Casts the given object to the given type only if the object is of the given type. If the object is not of the given type, this method returns null.

Type Parameters:

T - the generic type to cast the given object to.

Parameters:

o - the object to cast.

type - the given type.

Returns:

the casted object, or null if the given object is not to the given type.