安全处理空值和数组的综合isEqual方法。

/** n o w  j a v a  . c o m 提供 **/

//package com.nowjava;


public class Main {

    public static void main(String[] argv) {

        Object value = "nowjava.com";

        Object otherValue = "nowjava.com";

        System.out.println(areEqual(value, otherValue));

    }


    /**

     * A comprehensive isEqual method that handles nulls and arrays safely.

     * 

     * @param value Object

     * @param otherValue Object

     * @return boolean

     */

    public static final boolean areEqual(Object value, Object otherValue) {

        if (value == otherValue)

            return true;

        if (value == null)

            return false;/** from N o w  J a v a  .   c o m**/

        if (otherValue == null)

            return false;


        if (value.getClass().getComponentType() != null)

            return arraysAreEqual(value, otherValue);

        return value.equals(otherValue);

    }


    /**

     * Returns true if the objects are array instances and each of their elements compares

     * via equals as well.

     * 

     * @param value Object

     * @param otherValue Object

     * @return boolean

     */

    public static final boolean arraysAreEqual(Object value,

            Object otherValue) {

        if (value instanceof Object[]) {

            if (otherValue instanceof Object[])

                return valuesAreTransitivelyEqual((Object[]) value,

                        (Object[]) otherValue);

            return false;

        }

        return false;

    }


    /**

     * Returns whether the arrays are equal by examining each of their elements, even if they are

     * arrays themselves.

     * 

     * @param thisArray Object[]

     * @param thatArray Object[]

     * @return boolean

     */

    public static final boolean valuesAreTransitivelyEqual(

            Object[] thisArray, Object[] thatArray) {

        if (thisArray == thatArray)

            return true;

        if ((thisArray == null) ||