jdk/test/java/lang/HashCode.java
author mduigou
Tue, 13 Nov 2012 20:02:48 -0800
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child 30046 cf2c86e1819e
permissions -rw-r--r--
7088913: Add compatible static hashCode(primitive) to primitive wrapper classes Summary: Adds static utility methods to each primitive wrapper class to allow calculation of a hashCode value from an unboxed primitive. Reviewed-by: darcy, smarks, dholmes
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/*
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 * Copyright 2009 Google, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 4245470 7088913
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 * @summary Test the primitive wrappers hashCode()
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 */
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import java.util.Objects;
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import java.util.Random;
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public class HashCode {
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    final Random rnd = new Random();
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    void testOrdinals(String args[]) throws Exception {
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        long[] longs = {
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            Long.MIN_VALUE,
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            Integer.MIN_VALUE,
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            Short.MIN_VALUE,
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            Character.MIN_VALUE,
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            Byte.MIN_VALUE,
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            -1, 0, 1,
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            Byte.MAX_VALUE,
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            Character.MAX_VALUE,
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            Short.MAX_VALUE,
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            Integer.MAX_VALUE,
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            Long.MAX_VALUE,
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            rnd.nextInt(),
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        };
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        for (long x : longs) {
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            check(    new Long(x).hashCode() == (int)((long)x ^ (long)x>>>32));
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            check(Long.valueOf(x).hashCode() == (int)((long)x ^ (long)x>>>32));
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            check(  (new Long(x)).hashCode() == Long.hashCode(x));
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            check(    new Integer((int)x).hashCode() == (int) x);
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            check(Integer.valueOf((int)x).hashCode() == (int) x);
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            check(  (new Integer((int)x)).hashCode() == Integer.hashCode((int)x));
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            check(    new Short((short)x).hashCode() == (short) x);
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            check(Short.valueOf((short)x).hashCode() == (short) x);
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            check(         (new Short((short)x)).hashCode() == Short.hashCode((short)x));
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            check(    new Character((char) x).hashCode() == (char) x);
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            check(Character.valueOf((char) x).hashCode() == (char) x);
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            check(         (new Character((char)x)).hashCode() == Character.hashCode((char)x));
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            check(    new Byte((byte) x).hashCode() == (byte) x);
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            check(Byte.valueOf((byte) x).hashCode() == (byte) x);
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            check(         (new Byte((byte)x)).hashCode() == Byte.hashCode((byte)x));
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        }
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    }
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    void testBoolean() {
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        check( Boolean.FALSE.hashCode() == 1237);
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        check( Boolean.TRUE.hashCode() == 1231);
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        check( Boolean.valueOf(false).hashCode() == 1237);
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        check( Boolean.valueOf(true).hashCode() == 1231);
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        check( (new Boolean(false)).hashCode() == 1237);
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        check( (new Boolean(true)).hashCode() == 1231);
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        check( Boolean.hashCode(false) == 1237);
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        check( Boolean.hashCode(true) == 1231);
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    }
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    void testFloat() {
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        float[] floats = {
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            Float.NaN,
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            Float.NEGATIVE_INFINITY,
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               -1f,
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               0f,
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               1f,
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               Float.POSITIVE_INFINITY
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        };
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        for(float f : floats) {
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            check( Float.hashCode(f) == Float.floatToIntBits(f));
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            check( Float.valueOf(f).hashCode() == Float.floatToIntBits(f));
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            check( (new Float(f)).hashCode() == Float.floatToIntBits(f));
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        }
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    }
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    void testDouble() {
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        double[] doubles = {
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            Double.NaN,
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            Double.NEGATIVE_INFINITY,
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               -1f,
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               0f,
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               1f,
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               Double.POSITIVE_INFINITY
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        };
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        for(double d : doubles) {
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            long bits = Double.doubleToLongBits(d);
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            int bitsHash = (int)(bits^(bits>>>32));
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            check( Double.hashCode(d) == bitsHash);
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            check( Double.valueOf(d).hashCode() == bitsHash);
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            check( (new Double(d)).hashCode() == bitsHash);
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        }
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    }
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    //--------------------- Infrastructure ---------------------------
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    volatile int passed = 0, failed = 0;
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    void pass() {passed++;}
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    void fail() {failed++; Thread.dumpStack();}
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    void fail(String msg) {System.err.println(msg); fail();}
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    void unexpected(Throwable t) {failed++; t.printStackTrace();}
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    void check(boolean cond) {if (cond) pass(); else fail();}
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    void equal(Object x, Object y) {
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        if (Objects.equals(x,y)) pass();
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        else fail(x + " not equal to " + y);}
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    public static void main(String[] args) throws Throwable {
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        new HashCode().instanceMain(args);}
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    public void instanceMain(String[] args) throws Throwable {
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        try { testOrdinals(args);
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              testBoolean();
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                testFloat();
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                testDouble();
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        } catch (Throwable t) {unexpected(t);}
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        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
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        if (failed > 0) throw new AssertionError("Some tests failed");}
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   139
}