Java Hash Code Calculate hashCode(byte a[])

Description

Returns a hash code based on the contents of the specified array.

License

Open Source License

Parameter

Parameter	Description
a	the array whose hash value to compute

Return

a content-based hash code for a

Declaration

public static int hashCode(byte a[]) 

Method Source Code

//package com.java2s;
/*// www .  j  a v  a 2  s  .c om
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

public class Main {
    /**
     * Returns a hash code based on the contents of the specified array. For any
     * two <tt>byte</tt> arrays <tt>a</tt> and <tt>b</tt> such that
     * <tt>Arrays.equals(a, b)</tt>, it is also the case that
     * <tt>Arrays.hashCode(a) == Arrays.hashCode(b)</tt>.
     * 
     * <p>
     * The value returned by this method is the same value that would be obtained
     * by invoking the {@link List#hashCode() <tt>hashCode</tt>} method on a
     * {@link List} containing a sequence of {@link Byte} instances representing
     * the elements of <tt>a</tt> in the same order. If <tt>a</tt> is
     * <tt>null</tt>, this method returns 0.
     * 
     * @param a the array whose hash value to compute
     * @return a content-based hash code for <tt>a</tt>
     */
    public static int hashCode(byte a[]) {
        if (a == null) {
            return 0;
        }

        int result = 1;
        for (int i = 0; i < a.length; i++) {
            result = 31 * result + a[i];
        }

        return result;
    }
}

Related

1. hashCode(boolean b)
2. hashCode(boolean b)
3. hashCode(boolean bool)
4. hashCode(boolean bool)
5. hashCode(boolean value)
6. hashCode(byte a[], int offset, int length)
7. hashCode(byte[] array)
8. hashCode(byte[] array, int size)
9. hashCode(byte[] bytes, int offset, int length)