ObjectUtils (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.util
Class ObjectUtils

java.lang.Object
  org.springframework.util.ObjectUtils

public abstract class ObjectUtils
extends Object
extends Object

Miscellaneous object utility methods. Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of object utilities.

Since:: 19.03.2004
Author:: Juergen Hoeller, Keith Donald, Rod Johnson
See Also:: org.apache.commons.lang.ObjectUtils

Constructor Summary

ObjectUtils()


Method Summary

static Object[] addObjectToArray(Object[] array, Object obj)
          Append the given Object to the given array, returning a new array consisting of the input array contents plus the given Object.

static String getIdentityHexString(Object obj)
          Return a hex string form of an object's identity hash code.

static boolean isCheckedException(Throwable ex)
          Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.

static boolean isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions)
          Check whether the given exception is compatible with the exceptions declared in a throws clause.

static boolean isEmpty(Object[] array)
          Return whether the given array is empty: that is, null or of zero length.

static boolean nullSafeEquals(Object o1, Object o2)
          Determine if the given objects are equal, returning true if both are null or false if only one is null.

static Object[] toObjectArray(Object source)
          Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

Methods inherited from class java.lang.Object

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

Constructor Summary
`ObjectUtils()`

Method Summary
`static Object[]`	`addObjectToArray(Object[] array, Object obj)` Append the given Object to the given array, returning a new array consisting of the input array contents plus the given Object.
`static String`	`getIdentityHexString(Object obj)` Return a hex string form of an object's identity hash code.
`static boolean`	`isCheckedException(Throwable ex)` Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.
`static boolean`	`isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions)` Check whether the given exception is compatible with the exceptions declared in a throws clause.
`static boolean`	`isEmpty(Object[] array)` Return whether the given array is empty: that is, `null` or of zero length.
`static boolean`	`nullSafeEquals(Object o1, Object o2)` Determine if the given objects are equal, returning true if both are null or false if only one is null.
`static Object[]`	`toObjectArray(Object source)` Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

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

Constructor Detail

ObjectUtils

public ObjectUtils()

Method Detail

nullSafeEquals

public static boolean nullSafeEquals(Object o1,
                                     Object o2)

Determine if the given objects are equal, returning true if both are null or false if only one is null.

Parameters:: o1 - first Object to compare; o2 - second Object to compare
Returns:: whether the given objects are equal

getIdentityHexString

public static String getIdentityHexString(Object obj)

Return a hex string form of an object's identity hash code.

Parameters:: obj - the object
Returns:: the object's identity code in hex

isCheckedException

public static boolean isCheckedException(Throwable ex)

Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.

Parameters:: ex - the throwable to check
Returns:: whether the throwable is a checked exception
See Also:: Exception, RuntimeException, Error

isCompatibleWithThrowsClause

public static boolean isCompatibleWithThrowsClause(Throwable ex,
                                                   Class[] declaredExceptions)

Check whether the given exception is compatible with the exceptions declared in a throws clause.

Parameters:: ex - the exception to checked; declaredExceptions - the exceptions declared in the throws clause
Returns:: whether the given exception is compatible

isEmpty

public static boolean isEmpty(Object[] array)

Return whether the given array is empty: that is, null or of zero length.

Parameters:: array - the array to check

addObjectToArray

public static Object[] addObjectToArray(Object[] array,
                                        Object obj)

Append the given Object to the given array, returning a new array consisting of the input array contents plus the given Object.

Parameters:: array - the array to append to (can be null); obj - the Object to append
Returns:: the new array (of the same component type; never null)

toObjectArray

public static Object[] toObjectArray(Object source)

Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

A null source value will be converted to an empty Object array.

Parameters:: source - the (potentially primitive) array
Returns:: the corresponding object array
Throws:: IllegalArgumentException - if the parameter is not an array