82 lines
2.9 KiB
Java
82 lines
2.9 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. 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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* @summary Tests that equals(Object) is consistent with hashCode(),
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* in particular regarding negative versus positive zeros and
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* NaN values.
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*/
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import java.awt.geom.AffineTransform;
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public class EqualsAndHashCode {
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private static boolean failed;
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public static void main(String arg[]) {
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checkReflexiveEquals();
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checkZeros();
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checkNotEqual();
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if (failed) {
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throw new RuntimeException("Some tests failed.");
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}
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}
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private static void checkReflexiveEquals() {
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AffineTransform t = new AffineTransform(1, 0, 0, 1, Double.NaN, 0);
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if (!t.equals(t)) {
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System.err.println("Transform should be equal to itself.");
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failed = true;
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}
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if (!t.equals(t.clone())) {
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System.err.println("Transform should be equal to its clone.");
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failed = true;
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}
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}
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private static void checkZeros() {
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AffineTransform positive = new AffineTransform(2, 0, 0, 3, 0, +0.0);
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AffineTransform negative = new AffineTransform(2, 0, 0, 3, 0, -0.0);
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if (!positive.equals(negative)) {
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System.err.println("Transforms should be equal despite the sign difference in zero values.");
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failed = true;
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} else if (positive.hashCode() != negative.hashCode()) {
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System.err.println("Equal transforms should have the same hash code value.");
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failed = true;
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}
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}
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private static void checkNotEqual() {
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AffineTransform t1 = new AffineTransform(2, 0, 0, 3, 2, 0);
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AffineTransform t2 = new AffineTransform(2, 0, 0, 3, 2, 4);
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if (t1.equals(t2)) {
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System.err.println("Expected non-equal transforms.");
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failed = true;
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}
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if (t1.hashCode() == t2.hashCode()) {
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System.err.println("Expected different hash codes.");
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failed = true;
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}
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}
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}
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