Java Hash Code Calculate hashCode(double dbl)

Description

Return the same value as Double#hashCode() .

License

Apache License

Declaration

public static int hashCode(double dbl) 

Method Source Code

//package com.java2s;
/*// w w  w.  j  a v  a  2  s  .  c om
 * 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 {
    /**
     * Return the same value as <code>{@link Boolean#hashCode()}</code>.
     * @see Boolean#hashCode()
     */
    public static int hashCode(boolean bool) {
        return bool ? 1231 : 1237;
    }

    /**
     * Return the same value as <code>{@link Double#hashCode()}</code>.
     * @see Double#hashCode()
     */
    public static int hashCode(double dbl) {
        long bits = Double.doubleToLongBits(dbl);
        return hashCode(bits);
    }

    /**
     * Return the same value as <code>{@link Float#hashCode()}</code>.
     * @see Float#hashCode()
     */
    public static int hashCode(float flt) {
        return Float.floatToIntBits(flt);
    }

    /**
     * Return the same value as <code>{@link Long#hashCode()}</code>.
     * @see Long#hashCode()
     */
    public static int hashCode(long lng) {
        return (int) (lng ^ (lng >>> 32));
    }

    /**
     * <p>Gets the hash code of an object returning zero when the
     * object is {@code null}.</p>
     *
     * <pre>
     * ObjectUtils.hashCode(null)   = 0
     * ObjectUtils.hashCode(obj)    = obj.hashCode()
     * </pre>
     *
     * @param obj  the object to obtain the hash code of, may be {@code null}
     * @return the hash code of the object, or zero if null
     * @since 2.1
     */
    public static int hashCode(Object obj) {
        // hashCode(Object) retained for performance, as hash code is often critical
        return (obj == null) ? 0 : obj.hashCode();
    }
}

Related

1. hashCode(byte[] data, int offset, int len, int seed)
2. hashCode(char[] array)
3. hashCode(char[] array, int start, int end)
4. hashCode(char[] array, int start, int end)
5. hashCode(CharSequence seq)
6. hashCode(double v)
7. hashCode(double val)
8. hashCode(final byte[] data)
9. hashCode(final char[] text, final int textOffset, final int textLen)