Calculate hash Code of int array - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

Calculate hash Code of int array

Demo Code

/**//from   w w  w. j a  va2 s. co m
 * 
 * Copyright 2008 - 2011
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 * 
 * @project loonframework
 * @author chenpeng
 * @email?ceponline@yahoo.com.cn
 * @version 0.1.1
 */
//package com.java2s;

public class Main {

    public static int hashCode(int[][] arrays) {
        if (arrays == null) {
            return 0;
        }
        int result = 1;
        int h = arrays.length;
        int w = arrays[0].length;
        int value = 0;
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                value = arrays[i][j];
                int elementHash = (value ^ (value >>> 32));
                result = 31 * result + elementHash;
            }
        }
        return result;
    }
}

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