Quelle Compare.java Sprache: JAVA

/*
* Copyright 2009 Google, Inc.  All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @bug 6582946
* @summary Test the primitive wrappers compare and compareTo methods
* @key randomness
*/

import java.util.Random;

public class Compare {

    final Random rnd = new Random();

    boolean toBoolean(long x) { return x > 0; }

    void compareAll(long x, long y) {
        check(Double.compare(x, y) ==
              Double.valueOf(x).compareTo(Double.valueOf(y)));
        check(Float.compare(x, y) ==
              Float.valueOf(x).compareTo(Float.valueOf(y)));
        check(Long.compare(x, y) ==
              Long.valueOf(x).compareTo(Long.valueOf(y)));
        check(Integer.compare((int) x, (int) y) ==
              Integer.valueOf((int) x).compareTo(Integer.valueOf((int) y)));
        check(Short.compare((short) x, (short) y) ==
              Short.valueOf((short) x).compareTo(Short.valueOf((short) y)));
        check(Character.compare((char) x, (char) y) ==
              Character.valueOf((char) x).compareTo(Character.valueOf((char) y)));
        check(Byte.compare((byte) x, (byte) y) ==
              Byte.valueOf((byte) x).compareTo(Byte.valueOf((byte) y)));
        check(Boolean.compare(toBoolean(x), toBoolean(y)) ==
              Boolean.valueOf(toBoolean(x)).compareTo(Boolean.valueOf(toBoolean(y))));

        check(Double.compare(x, y) == -Double.compare(y, x));
        check(Float.compare(x, y) == -Float.compare(y, x));
        check(Long.compare(x, y) == -Long.compare(y, x));
        check(Integer.compare((int) x, (int) y) ==
              -Integer.compare((int) y, (int) x));
        check(Short.compare((short) x, (short) y) ==
              -Short.compare((short) y, (short) x));
        check(Character.compare((char) x, (char) y) ==
              -Character.compare((char) y, (char) x));
        check(Byte.compare((byte) x, (byte) y) ==
              -Byte.compare((byte) y, (byte) x));

        equal(Long.compare(x, y),
              x < y ? -1 : x > y ? 1 : 0);

        {
            int a = (int) x, b = (int) y;
            equal(Integer.compare(a, b),
                  a < b ? -1 : a > b ? 1 : 0);
        }

        {
            short a = (short) x, b = (short) y;
            equal(Short.compare(a, b),
                  a - b);
        }

        {
            char a = (char) x, b = (char) y;
            equal(Character.compare(a, b),
                  a - b);
        }

        {
            byte a = (byte) x, b = (byte) y;
            equal(Byte.compare(a, b),
                  a - b);
        }

        {
            boolean a = toBoolean(x), b = toBoolean(y);
            equal(Boolean.compare(a, b),
                  a == b ? 0 : a ? 1 : -1);
        }
    }

    void test(String args[]) throws Exception {
        long[] longs = {
            Long.MIN_VALUE,
            Integer.MIN_VALUE,
            Short.MIN_VALUE,
            Character.MIN_VALUE,
            Byte.MIN_VALUE,
            -1, 0, 1,
            Byte.MAX_VALUE,
            Character.MAX_VALUE,
            Short.MAX_VALUE,
            Integer.MAX_VALUE,
            Long.MAX_VALUE,
            rnd.nextLong(),
            rnd.nextInt(),
        };

        for (long x : longs) {
            for (long y : longs) {
                compareAll(x, y);
            }
        }
    }

    //--------------------- Infrastructure ---------------------------
    volatile int passed = 0, failed = 0;
    void pass() {passed++;}
    void fail() {failed++; Thread.dumpStack();}
    void fail(String msg) {System.err.println(msg); fail();}
    void unexpected(Throwable t) {failed++; t.printStackTrace();}
    void check(boolean cond) {if (cond) pass(); else fail();}
    void equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) pass();
        else fail(x + " not equal to " + y);}
    public static void main(String[] args) throws Throwable {
        new Compare().instanceMain(args);}
    public void instanceMain(String[] args) throws Throwable {
        try {test(args);} catch (Throwable t) {unexpected(t);}
        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}
}

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