Java Hash Code Calculate hashCodeOf(Object o)

Description

hash Code Of

License

Apache License

Declaration

public static int hashCodeOf(Object o) 

Method Source Code

//package com.java2s;
/**//www.  j  av a  2s . c  o m
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.
 */

public class Main {
    public static int hashCodeOf(Object o) {
        if (o != null)
            return o.hashCode();
        else
            return 0;
    }

    public static int hashCodeOf(int previousHashCode, Object o) {
        return 31 * previousHashCode + hashCodeOf(o);
    }

    public static int hashCodeOf(int previousHashCode, int value) {
        return 31 * previousHashCode + value;
    }

    public static int hashCodeOf(int previousHashCode, long value) {
        return 31 * previousHashCode + (int) (value ^ (value >>> 32));
    }
}

Related

1. hashcode_old(final int[] array)
2. hashCodeEps(double value)
3. hashCodeForDoubleArray(double[] a)
4. hashCodeLowerCase(Object... toHash)
5. hashCodeNullSafe(final Object o)
6. hashCodeOrDefault(Object obj)
7. hashCodeOrNull(Object[] array)
8. hashCodeOrZero(Object o)
9. hashCodeSafe(final Object value)