Java Hash Calculate hash(double value)

Description

Returns an integer hash code representing the given double value.

License

Apache License

Parameter

Parameter	Description
value	the value to be hashed

Return

the hash code

Declaration

public static int hash(double value) 

Method Source Code

//package com.java2s;
/*//from  ww w . j  a v a 2  s  . co  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.
 */

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;
    }
}

Related

1. hash(byte[] bytes)
2. hash(byte[] bytes)
3. hash(byte[] data)
4. hash(byte[] digest, int number)
5. hash(char[] str, int start, int length)
6. hash(final boolean value)
7. hash(final int value)
8. hash(final Object key, final Object value)
9. hash(final Object object)