org.incava.ijdk.lang

Class ObjectExt

java.lang.Object

org.incava.ijdk.lang.ObjectExt

Direct Known Subclasses:

CollectionExt

public class ObjectExt
extends java.lang.Object

Extensions to the Object class.

See Also:

Obj

Constructor Summary

Constructors

Constructor and Description
ObjectExt()

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(java.lang.Object x, java.lang.Object y) Returns whether the objects are equal, including whether they are both null.
static <A extends java.lang.Comparable<A>> int	compare(A x, A y) Compares the two objects, including testing for null.
static boolean	equal(java.lang.Object x, java.lang.Object y) Returns whether the objects are equal, including whether they are both null.
static boolean	isEmpty(java.lang.Object obj) Returns whether the object is null or is a string or collection of zero length.
static boolean	isFalse(java.lang.Object obj) Returns whether the object is null or is a string or collection of zero length.
static boolean	isNotNull(java.lang.Object obj) Returns whether the object is not null.
static boolean	isNull(java.lang.Object obj) Returns whether the object is null.
static boolean	isTrue(java.lang.Object obj) Returns whether the object is non-null and, if it is a collection or a string, has a length greater than zero.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectExt

public ObjectExt()

Method Detail

areEqual

public static boolean areEqual(java.lang.Object x,
                               java.lang.Object y)

Returns whether the objects are equal, including whether they are both null.

Parameters:

x - the first object to compare

y - the second object to compare

Returns:

whether the objects are equal or both are null

equal

public static boolean equal(java.lang.Object x,
                            java.lang.Object y)

Returns whether the objects are equal, including whether they are both null. This is the same as areEqual, only more concise.

Parameters:

x - the first object to compare

y - the second object to compare

Returns:

whether the objects are equal or both are null

See Also:

areEqual(java.lang.Object, java.lang.Object)

compare

public static <A extends java.lang.Comparable<A>> int compare(A x,
                                                              A y)

Compares the two objects, including testing for null.

Type Parameters:

A - the type of objects; is Comparable

Parameters:

x - the first object to compare

y - the second object to compare

Returns:

a negative, zero, or positive integer

isTrue

public static boolean isTrue(java.lang.Object obj)

Returns whether the object is non-null and, if it is a collection or a string, has a length greater than zero.

Parameters:

obj - the object

Returns:

whether the object is not null and is true for that object type

See Also:

isEmpty(java.lang.Object), isFalse(java.lang.Object), Obj.isTrue()

isFalse

public static boolean isFalse(java.lang.Object obj)

Returns whether the object is null or is a string or collection of zero length.

Parameters:

obj - the object

Returns:

whether the object is null or is false for that object type

See Also:

isEmpty(java.lang.Object), isFalse(java.lang.Object), Obj.isFalse()

isEmpty

public static boolean isEmpty(java.lang.Object obj)

Returns whether the object is null or is a string or collection of zero length.

Parameters:

obj - the object

Returns:

whether the object is null or is empty for that object type

See Also:

isEmpty(java.lang.Object), isFalse(java.lang.Object), Obj.isEmpty()

isNull

public static boolean isNull(java.lang.Object obj)

Returns whether the object is null. This method provides an alternative syntax to "if (obj == null)".

Parameters:

obj - the object

Returns:

whether the object is null

See Also:

isNotNull(java.lang.Object)

isNotNull

public static boolean isNotNull(java.lang.Object obj)

Returns whether the object is not null. This method provides an alternative syntax to "if (obj != null)".

Parameters:

obj - the object

Returns:

whether the object is not null

See Also:

isNull(java.lang.Object)