Returns an integer hash code representing the given double value. - Java java.lang

Java examples for java.lang:Math Value

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Description

Returns an integer hash code representing the given double value.

Demo Code

/*/*from w w  w .  j a va 2  s.c  o m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
//package com.java2s;

public class Main {
    /**
     * Returns an integer hash code representing the given double value.
     * 
     * @param value the value to be hashed
     * @return the hash code
     */
    public static int hash(double value) {
        long bits = Double.doubleToLongBits(value);
        return (int) (bits ^ (bits >>> 32));
    }

    /**
     * Returns an integer hash code representing the given double array value.
     * 
     * @param value the value to be hashed (may be null)
     * @return the hash code
     * @since 1.2
     */
    public static int hash(double[] value) {
        if (value == null) {
            return 0;
        }
        int result = value.length;
        for (int i = 0; i < value.length; ++i) {
            result = result * 31 + hash(value[i]);
        }
        return result;
    }
}

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