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Java example source code file (EqualsBuilderTest.java)

This example Java source code file (EqualsBuilderTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

object, override, string, suppresswarnings, test, testacanequalb, testbcanequala, testemptysubobject, testobject, testobjectequalsexclude, testobjectreference, testsubobject, testtsubobject, testttleafobject, util

The EqualsBuilderTest.java Java example source code

/*
 * 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.
 */
package org.apache.commons.lang3.builder;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;

import org.junit.Test;

/**
 * Unit tests {@link org.apache.commons.lang3.builder.EqualsBuilder}.
 */
public class EqualsBuilderTest {

    //-----------------------------------------------------------------------

    static class TestObject {
        private int a;
        public TestObject() {
        }
        public TestObject(final int a) {
            this.a = a;
        }
        @Override
        public boolean equals(final Object o) {
            if (o == null) { return false; }
            if (o == this) { return true; }
            if (o.getClass() != getClass()) {
                return false;
            }

            final TestObject rhs = (TestObject) o;
            return a == rhs.a;
        }

        @Override
        public int hashCode() {
            return a;
        }

        public void setA(final int a) {
            this.a = a;
        }

        public int getA() {
            return a;
        }
    }

    static class TestSubObject extends TestObject {
        private int b;
        public TestSubObject() {
            super(0);
        }
        public TestSubObject(final int a, final int b) {
            super(a);
            this.b = b;
        }
        @Override
        public boolean equals(final Object o) {
            if (o == null) { return false; }
            if (o == this) { return true; }
            if (o.getClass() != getClass()) {
                return false;
            }

            final TestSubObject rhs = (TestSubObject) o;
            return super.equals(o) && b == rhs.b;
        }

        @Override
        public int hashCode() {
            return b *17 + super.hashCode();
        }

        public void setB(final int b) {
            this.b = b;
        }

        public int getB() {
            return b;
        }
    }
    
    static class TestEmptySubObject extends TestObject {
        public TestEmptySubObject(final int a) {
            super(a);
        }
    }

    static class TestTSubObject extends TestObject {
        @SuppressWarnings("unused")
        private transient int t;
        public TestTSubObject(final int a, final int t) {
            super(a);
            this.t = t;
        }
    }

    static class TestTTSubObject extends TestTSubObject {
        @SuppressWarnings("unused")
        private transient int tt;
        public TestTTSubObject(final int a, final int t, final int tt) {
            super(a, t);
            this.tt = tt;
        }
    }

    static class TestTTLeafObject extends TestTTSubObject {
        @SuppressWarnings("unused")
        private final int leafValue;
        public TestTTLeafObject(final int a, final int t, final int tt, final int leafValue) {
            super(a, t, tt);
            this.leafValue = leafValue;
        }
    }

    static class TestTSubObject2 extends TestObject {
        private transient int t;
        public TestTSubObject2(final int a, final int t) {
            super(a);
        }
        public int getT() {
            return t;
        }
        public void setT(final int t) {
            this.t = t;
        }
    }

    @Test
    public void testReflectionEquals() {
        final TestObject o1 = new TestObject(4);
        final TestObject o2 = new TestObject(5);
        assertTrue(EqualsBuilder.reflectionEquals(o1, o1));
        assertTrue(!EqualsBuilder.reflectionEquals(o1, o2));
        o2.setA(4);
        assertTrue(EqualsBuilder.reflectionEquals(o1, o2));

        assertTrue(!EqualsBuilder.reflectionEquals(o1, this));

        assertTrue(!EqualsBuilder.reflectionEquals(o1, null));
        assertTrue(!EqualsBuilder.reflectionEquals(null, o2));
        assertTrue(EqualsBuilder.reflectionEquals((Object) null, (Object) null));
    }
    
    @Test
    public void testReflectionHierarchyEquals() {
        testReflectionHierarchyEquals(false);
        testReflectionHierarchyEquals(true);
        // Transients
        assertTrue(EqualsBuilder.reflectionEquals(new TestTTLeafObject(1, 2, 3, 4), new TestTTLeafObject(1, 2, 3, 4), true));
        assertTrue(EqualsBuilder.reflectionEquals(new TestTTLeafObject(1, 2, 3, 4), new TestTTLeafObject(1, 2, 3, 4), false));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestTTLeafObject(1, 0, 0, 4), new TestTTLeafObject(1, 2, 3, 4), true));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestTTLeafObject(1, 2, 3, 4), new TestTTLeafObject(1, 2, 3, 0), true));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestTTLeafObject(0, 2, 3, 4), new TestTTLeafObject(1, 2, 3, 4), true));
    }

    private void testReflectionHierarchyEquals(final boolean testTransients) {
        final TestObject to1 = new TestObject(4);
        final TestObject to1Bis = new TestObject(4);
        final TestObject to1Ter = new TestObject(4);
        final TestObject to2 = new TestObject(5);
        final TestEmptySubObject teso = new TestEmptySubObject(4);
        final TestTSubObject ttso = new TestTSubObject(4, 1);
        final TestTTSubObject tttso = new TestTTSubObject(4, 1, 2);
        final TestTTLeafObject ttlo = new TestTTLeafObject(4, 1, 2, 3);
        final TestSubObject tso1 = new TestSubObject(1, 4);
        final TestSubObject tso1bis = new TestSubObject(1, 4);
        final TestSubObject tso1ter = new TestSubObject(1, 4);
        final TestSubObject tso2 = new TestSubObject(2, 5);

        testReflectionEqualsEquivalenceRelationship(to1, to1Bis, to1Ter, to2, new TestObject(), testTransients);
        testReflectionEqualsEquivalenceRelationship(tso1, tso1bis, tso1ter, tso2, new TestSubObject(), testTransients);

        // More sanity checks:

        // same values
        assertTrue(EqualsBuilder.reflectionEquals(ttlo, ttlo, testTransients));
        assertTrue(EqualsBuilder.reflectionEquals(new TestSubObject(1, 10), new TestSubObject(1, 10), testTransients));
        // same super values, diff sub values
        assertTrue(!EqualsBuilder.reflectionEquals(new TestSubObject(1, 10), new TestSubObject(1, 11), testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestSubObject(1, 11), new TestSubObject(1, 10), testTransients));
        // diff super values, same sub values
        assertTrue(!EqualsBuilder.reflectionEquals(new TestSubObject(0, 10), new TestSubObject(1, 10), testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestSubObject(1, 10), new TestSubObject(0, 10), testTransients));

        // mix super and sub types: equals
        assertTrue(EqualsBuilder.reflectionEquals(to1, teso, testTransients));
        assertTrue(EqualsBuilder.reflectionEquals(teso, to1, testTransients));

        assertTrue(EqualsBuilder.reflectionEquals(to1, ttso, false)); // Force testTransients = false for this assert
        assertTrue(EqualsBuilder.reflectionEquals(ttso, to1, false)); // Force testTransients = false for this assert

        assertTrue(EqualsBuilder.reflectionEquals(to1, tttso, false)); // Force testTransients = false for this assert
        assertTrue(EqualsBuilder.reflectionEquals(tttso, to1, false)); // Force testTransients = false for this assert

        assertTrue(EqualsBuilder.reflectionEquals(ttso, tttso, false)); // Force testTransients = false for this assert
        assertTrue(EqualsBuilder.reflectionEquals(tttso, ttso, false)); // Force testTransients = false for this assert

        // mix super and sub types: NOT equals
        assertTrue(!EqualsBuilder.reflectionEquals(new TestObject(0), new TestEmptySubObject(1), testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestEmptySubObject(1), new TestObject(0), testTransients));

        assertTrue(!EqualsBuilder.reflectionEquals(new TestObject(0), new TestTSubObject(1, 1), testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestTSubObject(1, 1), new TestObject(0), testTransients));

        assertTrue(!EqualsBuilder.reflectionEquals(new TestObject(1), new TestSubObject(0, 10), testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(new TestSubObject(0, 10), new TestObject(1), testTransients));

        assertTrue(!EqualsBuilder.reflectionEquals(to1, ttlo));
        assertTrue(!EqualsBuilder.reflectionEquals(tso1, this));
    }

    /**
     * Equivalence relationship tests inspired by "Effective Java":
     * <ul>
     * <li>reflection
     * <li>symmetry
     * <li>transitive
     * <li>consistency
     * <li>non-null reference
     * </ul>
     * @param to a TestObject
     * @param toBis a TestObject, equal to to and toTer
     * @param toTer Left hand side, equal to to and toBis
     * @param to2 a different TestObject
     * @param oToChange a TestObject that will be changed
     * @param testTransients whether to test transient instance variables 
     */
    private void testReflectionEqualsEquivalenceRelationship(
        final TestObject to,
        final TestObject toBis,
        final TestObject toTer,
        final TestObject to2,
        final TestObject oToChange,
        final boolean testTransients) {

        // reflection test
        assertTrue(EqualsBuilder.reflectionEquals(to, to, testTransients));
        assertTrue(EqualsBuilder.reflectionEquals(to2, to2, testTransients));

        // symmetry test
        assertTrue(EqualsBuilder.reflectionEquals(to, toBis, testTransients) && EqualsBuilder.reflectionEquals(toBis, to, testTransients));

        // transitive test
        assertTrue(
            EqualsBuilder.reflectionEquals(to, toBis, testTransients)
                && EqualsBuilder.reflectionEquals(toBis, toTer, testTransients)
                && EqualsBuilder.reflectionEquals(to, toTer, testTransients));

        // consistency test
        oToChange.setA(to.getA());
        if (oToChange instanceof TestSubObject) {
            ((TestSubObject) oToChange).setB(((TestSubObject) to).getB());
        }
        assertTrue(EqualsBuilder.reflectionEquals(oToChange, to, testTransients));
        assertTrue(EqualsBuilder.reflectionEquals(oToChange, to, testTransients));
        oToChange.setA(to.getA() + 1);
        if (oToChange instanceof TestSubObject) {
            ((TestSubObject) oToChange).setB(((TestSubObject) to).getB() + 1);
        }
        assertTrue(!EqualsBuilder.reflectionEquals(oToChange, to, testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(oToChange, to, testTransients));

        // non-null reference test
        assertTrue(!EqualsBuilder.reflectionEquals(to, null, testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(to2, null, testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(null, to, testTransients));
        assertTrue(!EqualsBuilder.reflectionEquals(null, to2, testTransients));
        assertTrue(EqualsBuilder.reflectionEquals((Object) null, (Object) null, testTransients));
    }

    @Test
    public void testSuper() {
        final TestObject o1 = new TestObject(4);
        final TestObject o2 = new TestObject(5);
        assertTrue(new EqualsBuilder().appendSuper(true).append(o1, o1).isEquals());
        assertFalse(new EqualsBuilder().appendSuper(false).append(o1, o1).isEquals());
        assertFalse(new EqualsBuilder().appendSuper(true).append(o1, o2).isEquals());
        assertFalse(new EqualsBuilder().appendSuper(false).append(o1, o2).isEquals());
    }

    @Test
    public void testObject() {
        final TestObject o1 = new TestObject(4);
        final TestObject o2 = new TestObject(5);
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
        o2.setA(4);
        assertTrue(new EqualsBuilder().append(o1, o2).isEquals());

        assertTrue(!new EqualsBuilder().append(o1, this).isEquals());
        
        assertTrue(!new EqualsBuilder().append(o1, null).isEquals());
        assertTrue(!new EqualsBuilder().append(null, o2).isEquals());
        assertTrue(new EqualsBuilder().append((Object) null, (Object) null).isEquals());
    }
    
    @Test
    public void testObjectBuild() {
        final TestObject o1 = new TestObject(4);
        final TestObject o2 = new TestObject(5);
        assertEquals(Boolean.TRUE, new EqualsBuilder().append(o1, o1).build());
        assertEquals(Boolean.FALSE, new EqualsBuilder().append(o1, o2).build());
        o2.setA(4);
        assertEquals(Boolean.TRUE, new EqualsBuilder().append(o1, o2).build());

        assertEquals(Boolean.FALSE, new EqualsBuilder().append(o1, this).build());
        
        assertEquals(Boolean.FALSE, new EqualsBuilder().append(o1, null).build());
        assertEquals(Boolean.FALSE, new EqualsBuilder().append(null, o2).build());
        assertEquals(Boolean.TRUE, new EqualsBuilder().append((Object) null, (Object) null).build());
    }

    @Test
    public void testLong() {
        final long o1 = 1L;
        final long o2 = 2L;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testInt() {
        final int o1 = 1;
        final int o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testShort() {
        final short o1 = 1;
        final short o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testChar() {
        final char o1 = 1;
        final char o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testByte() {
        final byte o1 = 1;
        final byte o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testDouble() {
        final double o1 = 1;
        final double o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, Double.NaN).isEquals());
        assertTrue(new EqualsBuilder().append(Double.NaN, Double.NaN).isEquals());
        assertTrue(new EqualsBuilder().append(Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY).isEquals());
    }

    @Test
    public void testFloat() {
        final float o1 = 1;
        final float o2 = 2;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, Float.NaN).isEquals());
        assertTrue(new EqualsBuilder().append(Float.NaN, Float.NaN).isEquals());
        assertTrue(new EqualsBuilder().append(Float.POSITIVE_INFINITY, Float.POSITIVE_INFINITY).isEquals());
    }

    @Test
    public void testAccessors() {
        final EqualsBuilder equalsBuilder = new EqualsBuilder();
        assertTrue(equalsBuilder.isEquals());
        equalsBuilder.setEquals(true);
        assertTrue(equalsBuilder.isEquals());
        equalsBuilder.setEquals(false);
        assertFalse(equalsBuilder.isEquals());
    }

    @Test
    public void testReset() {
        final EqualsBuilder equalsBuilder = new EqualsBuilder();
        assertTrue(equalsBuilder.isEquals());
        equalsBuilder.setEquals(false);
        assertFalse(equalsBuilder.isEquals());
        equalsBuilder.reset();
        assertTrue(equalsBuilder.isEquals());
    }
    
    @Test
    public void testBoolean() {
        final boolean o1 = true;
        final boolean o2 = false;
        assertTrue(new EqualsBuilder().append(o1, o1).isEquals());
        assertTrue(!new EqualsBuilder().append(o1, o2).isEquals());
    }

    @Test
    public void testObjectArray() {
        TestObject[] obj1 = new TestObject[3];
        obj1[0] = new TestObject(4);
        obj1[1] = new TestObject(5);
        obj1[2] = null;
        TestObject[] obj2 = new TestObject[3];
        obj2[0] = new TestObject(4);
        obj2[1] = new TestObject(5);
        obj2[2] = null;
        
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj2, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1].setA(6);
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1].setA(5);
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[2] = obj1[1];
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[2] = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
                       
        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testLongArray() {
        long[] obj1 = new long[2];
        obj1[0] = 5L;
        obj1[1] = 6L;
        long[] obj2 = new long[2];
        obj2[0] = 5L;
        obj2[1] = 6L;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testIntArray() {
        int[] obj1 = new int[2];
        obj1[0] = 5;
        obj1[1] = 6;
        int[] obj2 = new int[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testShortArray() {
        short[] obj1 = new short[2];
        obj1[0] = 5;
        obj1[1] = 6;
        short[] obj2 = new short[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testCharArray() {
        char[] obj1 = new char[2];
        obj1[0] = 5;
        obj1[1] = 6;
        char[] obj2 = new char[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testByteArray() {
        byte[] obj1 = new byte[2];
        obj1[0] = 5;
        obj1[1] = 6;
        byte[] obj2 = new byte[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testDoubleArray() {
        double[] obj1 = new double[2];
        obj1[0] = 5;
        obj1[1] = 6;
        double[] obj2 = new double[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testFloatArray() {
        float[] obj1 = new float[2];
        obj1[0] = 5;
        obj1[1] = 6;
        float[] obj2 = new float[2];
        obj2[0] = 5;
        obj2[1] = 6;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testBooleanArray() {
        boolean[] obj1 = new boolean[2];
        obj1[0] = true;
        obj1[1] = false;
        boolean[] obj2 = new boolean[2];
        obj2[0] = true;
        obj2[1] = false;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1[1] = true;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());

        obj2 = null;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
        obj1 = null;
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testMultiLongArray() {
        final long[][] array1 = new long[2][2];
        final long[][] array2 = new long[2][2];
        for (int i = 0; i < array1.length; ++i) {
            for (int j = 0; j < array1[0].length; j++) {
                array1[i][j] = (i + 1) * (j + 1);
                array2[i][j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiIntArray() {
        final int[][] array1 = new int[2][2];
        final int[][] array2 = new int[2][2];
        for (int i = 0; i < array1.length; ++i) {
            for (int j = 0; j < array1[0].length; j++) {
                array1[i][j] = (i + 1) * (j + 1);
                array2[i][j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiShortArray() {
        final short[][] array1 = new short[2][2];
        final short[][] array2 = new short[2][2];
        for (short i = 0; i < array1.length; ++i) {
            for (short j = 0; j < array1[0].length; j++) {
                array1[i][j] = i;
                array2[i][j] = i;
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiCharArray() {
        final char[][] array1 = new char[2][2];
        final char[][] array2 = new char[2][2];
        for (char i = 0; i < array1.length; ++i) {
            for (char j = 0; j < array1[0].length; j++) {
                array1[i][j] = i;
                array2[i][j] = i;
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiByteArray() {
        final byte[][] array1 = new byte[2][2];
        final byte[][] array2 = new byte[2][2];
        for (byte i = 0; i < array1.length; ++i) {
            for (byte j = 0; j < array1[0].length; j++) {
                array1[i][j] = i;
                array2[i][j] = i;
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiFloatArray() {
        final float[][] array1 = new float[2][2];
        final float[][] array2 = new float[2][2];
        for (int i = 0; i < array1.length; ++i) {
            for (int j = 0; j < array1[0].length; j++) {
                array1[i][j] = (i + 1) * (j + 1);
                array2[i][j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiDoubleArray() {
        final double[][] array1 = new double[2][2];
        final double[][] array2 = new double[2][2];
        for (int i = 0; i < array1.length; ++i) {
            for (int j = 0; j < array1[0].length; j++) {
                array1[i][j] = (i + 1) * (j + 1);
                array2[i][j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMultiBooleanArray() {
        final boolean[][] array1 = new boolean[2][2];
        final boolean[][] array2 = new boolean[2][2];
        for (int i = 0; i < array1.length; ++i) {
            for (int j = 0; j < array1[0].length; j++) {
                array1[i][j] = i == 1 || j == 1;
                array2[i][j] = i == 1 || j == 1;
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = false;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
        
        // compare 1 dim to 2.
        final boolean[] array3 = new boolean[]{true, true};
        assertFalse(new EqualsBuilder().append(array1, array3).isEquals());
        assertFalse(new EqualsBuilder().append(array3, array1).isEquals());
        assertFalse(new EqualsBuilder().append(array2, array3).isEquals());
        assertFalse(new EqualsBuilder().append(array3, array2).isEquals());
    }

    @Test
    public void testRaggedArray() {
        final long array1[][] = new long[2][];
        final long array2[][] = new long[2][];
        for (int i = 0; i < array1.length; ++i) {
            array1[i] = new long[2];
            array2[i] = new long[2];
            for (int j = 0; j < array1[i].length; ++j) {
                array1[i][j] = (i + 1) * (j + 1);
                array2[i][j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        array1[1][1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testMixedArray() {
        final Object array1[] = new Object[2];
        final Object array2[] = new Object[2];
        for (int i = 0; i < array1.length; ++i) {
            array1[i] = new long[2];
            array2[i] = new long[2];
            for (int j = 0; j < 2; ++j) {
                ((long[]) array1[i])[j] = (i + 1) * (j + 1);
                ((long[]) array2[i])[j] = (i + 1) * (j + 1);
            }
        }
        assertTrue(new EqualsBuilder().append(array1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(array1, array2).isEquals());
        ((long[]) array1[1])[1] = 0;
        assertTrue(!new EqualsBuilder().append(array1, array2).isEquals());
    }

    @Test
    public void testObjectArrayHiddenByObject() {
        final TestObject[] array1 = new TestObject[2];
        array1[0] = new TestObject(4);
        array1[1] = new TestObject(5);
        final TestObject[] array2 = new TestObject[2];
        array2[0] = new TestObject(4);
        array2[1] = new TestObject(5);
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1].setA(6);
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testLongArrayHiddenByObject() {
        final long[] array1 = new long[2];
        array1[0] = 5L;
        array1[1] = 6L;
        final long[] array2 = new long[2];
        array2[0] = 5L;
        array2[1] = 6L;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testIntArrayHiddenByObject() {
        final int[] array1 = new int[2];
        array1[0] = 5;
        array1[1] = 6;
        final int[] array2 = new int[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testShortArrayHiddenByObject() {
        final short[] array1 = new short[2];
        array1[0] = 5;
        array1[1] = 6;
        final short[] array2 = new short[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testCharArrayHiddenByObject() {
        final char[] array1 = new char[2];
        array1[0] = 5;
        array1[1] = 6;
        final char[] array2 = new char[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testByteArrayHiddenByObject() {
        final byte[] array1 = new byte[2];
        array1[0] = 5;
        array1[1] = 6;
        final byte[] array2 = new byte[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testDoubleArrayHiddenByObject() {
        final double[] array1 = new double[2];
        array1[0] = 5;
        array1[1] = 6;
        final double[] array2 = new double[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testFloatArrayHiddenByObject() {
        final float[] array1 = new float[2];
        array1[0] = 5;
        array1[1] = 6;
        final float[] array2 = new float[2];
        array2[0] = 5;
        array2[1] = 6;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = 7;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }

    @Test
    public void testBooleanArrayHiddenByObject() {
        final boolean[] array1 = new boolean[2];
        array1[0] = true;
        array1[1] = false;
        final boolean[] array2 = new boolean[2];
        array2[0] = true;
        array2[1] = false;
        final Object obj1 = array1;
        final Object obj2 = array2;
        assertTrue(new EqualsBuilder().append(obj1, obj1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array1).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, obj2).isEquals());
        assertTrue(new EqualsBuilder().append(obj1, array2).isEquals());
        array1[1] = true;
        assertTrue(!new EqualsBuilder().append(obj1, obj2).isEquals());
    }
    
    public static class TestACanEqualB {
        private final int a;

        public TestACanEqualB(final int a) {
            this.a = a;
        }

        @Override
        public boolean equals(final Object o) {
            if (o == this) {
                return true;
            }
            if (o instanceof TestACanEqualB) {
                return this.a == ((TestACanEqualB) o).getA();
            }
            if (o instanceof TestBCanEqualA) {
                return this.a == ((TestBCanEqualA) o).getB();
            }
            return false;
        }

        @Override
        public int hashCode() {
            return a;
        }

        public int getA() {
            return this.a;
        }
    }

    public static class TestBCanEqualA {
        private final int b;

        public TestBCanEqualA(final int b) {
            this.b = b;
        }

        @Override
        public boolean equals(final Object o) {
            if (o == this) {
                return true;
            }
            if (o instanceof TestACanEqualB) {
                return this.b == ((TestACanEqualB) o).getA();
            }
            if (o instanceof TestBCanEqualA) {
                return this.b == ((TestBCanEqualA) o).getB();
            }
            return false;
        }

        @Override
        public int hashCode() {
            return b;
        }

        public int getB() {
            return this.b;
        }
    }
    
    /**
     * Tests two instances of classes that can be equal and that are not "related". The two classes are not subclasses
     * of each other and do not share a parent aside from Object.
     * See http://issues.apache.org/bugzilla/show_bug.cgi?id=33069
     */
    @Test
    public void testUnrelatedClasses() {
        final Object[] x = new Object[]{new TestACanEqualB(1)};
        final Object[] y = new Object[]{new TestBCanEqualA(1)};

        // sanity checks:
        assertTrue(Arrays.equals(x, x));
        assertTrue(Arrays.equals(y, y));
        assertTrue(Arrays.equals(x, y));
        assertTrue(Arrays.equals(y, x));
        // real tests:
        assertTrue(x[0].equals(x[0]));
        assertTrue(y[0].equals(y[0]));
        assertTrue(x[0].equals(y[0]));
        assertTrue(y[0].equals(x[0]));
        assertTrue(new EqualsBuilder().append(x, x).isEquals());
        assertTrue(new EqualsBuilder().append(y, y).isEquals());
        assertTrue(new EqualsBuilder().append(x, y).isEquals());
        assertTrue(new EqualsBuilder().append(y, x).isEquals());
    }
    
    /**
     * Test from http://issues.apache.org/bugzilla/show_bug.cgi?id=33067
     */
    @Test
    public void testNpeForNullElement() {
        final Object[] x1 = new Object[] { Integer.valueOf(1), null, Integer.valueOf(3) };
        final Object[] x2 = new Object[] { Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3) };

        // causes an NPE in 2.0 according to:
        // http://issues.apache.org/bugzilla/show_bug.cgi?id=33067
        new EqualsBuilder().append(x1, x2);
    }

    @Test
    public void testReflectionEqualsExcludeFields() throws Exception {
        final TestObjectWithMultipleFields x1 = new TestObjectWithMultipleFields(1, 2, 3);
        final TestObjectWithMultipleFields x2 = new TestObjectWithMultipleFields(1, 3, 4);

        // not equal when including all fields
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2));

        // doesn't barf on null, empty array, or non-existent field, but still tests as not equal
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2, (String[]) null));
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2, new String[] {}));
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2, new String[] {"xxx"}));

        // not equal if only one of the differing fields excluded
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2, new String[] {"two"}));
        assertTrue(!EqualsBuilder.reflectionEquals(x1, x2, new String[] {"three"}));

        // equal if both differing fields excluded
        assertTrue(EqualsBuilder.reflectionEquals(x1, x2, new String[] {"two", "three"}));

        // still equal as long as both differing fields are among excluded
        assertTrue(EqualsBuilder.reflectionEquals(x1, x2, new String[] {"one", "two", "three"}));
        assertTrue(EqualsBuilder.reflectionEquals(x1, x2, new String[] {"one", "two", "three", "xxx"}));
    }

    static class TestObjectWithMultipleFields {
        @SuppressWarnings("unused")
        private final TestObject one;
        @SuppressWarnings("unused")
        private final TestObject two;
        @SuppressWarnings("unused")
        private final TestObject three;

        public TestObjectWithMultipleFields(final int one, final int two, final int three) {
            this.one = new TestObject(one);
            this.two = new TestObject(two);
            this.three = new TestObject(three);
        }
    }
    
    /**
     * Test cyclical object references which cause a StackOverflowException if
     * not handled properly. s. LANG-606
     */
    @Test
    public void testCyclicalObjectReferences() {
        final TestObjectReference refX1 = new TestObjectReference(1);
        final TestObjectReference x1 = new TestObjectReference(1);
        x1.setObjectReference(refX1);
        refX1.setObjectReference(x1);

        final TestObjectReference refX2 = new TestObjectReference(1);
        final TestObjectReference x2 = new TestObjectReference(1);
        x2.setObjectReference(refX2);
        refX2.setObjectReference(x2);

        final TestObjectReference refX3 = new TestObjectReference(2);
        final TestObjectReference x3 = new TestObjectReference(2);
        x3.setObjectReference(refX3);
        refX3.setObjectReference(x3);

        assertTrue(x1.equals(x2));
        assertNull(EqualsBuilder.getRegistry());
        assertFalse(x1.equals(x3));
        assertNull(EqualsBuilder.getRegistry());
        assertFalse(x2.equals(x3));
        assertNull(EqualsBuilder.getRegistry());
    }

    static class TestObjectReference {
        @SuppressWarnings("unused")
        private TestObjectReference reference;
        @SuppressWarnings("unused")
        private final TestObject one;

        public TestObjectReference(final int one) {
            this.one = new TestObject(one);
        }

        public void setObjectReference(final TestObjectReference reference) {
            this.reference = reference;
        }

        @Override
        public boolean equals(final Object obj) {
            return EqualsBuilder.reflectionEquals(this, obj);
        }
    }
    
    @Test
    public void testReflectionArrays() throws Exception {

        final TestObject one = new TestObject(1);
        final TestObject two = new TestObject(2);

        final Object[] o1 = new Object[] { one };
        final Object[] o2 = new Object[] { two };
        final Object[] o3 = new Object[] { one };

        assertTrue(!EqualsBuilder.reflectionEquals(o1, o2));
        assertTrue(EqualsBuilder.reflectionEquals(o1, o1));
        assertTrue(EqualsBuilder.reflectionEquals(o1, o3));
        
        final double[] d1 = { 0, 1 };
        final double[] d2 = { 2, 3 };
        final double[] d3 = { 0, 1 };
        
        assertTrue(!EqualsBuilder.reflectionEquals(d1, d2));
        assertTrue(EqualsBuilder.reflectionEquals(d1, d1));
        assertTrue(EqualsBuilder.reflectionEquals(d1, d3));
    }

    static class TestObjectEqualsExclude {
        @EqualsExclude
        private int a;
        private int b;

        public TestObjectEqualsExclude(int a, int b) {
            this.a = a;
            this.b = b;
        }

        public int getA() {
            return a;
        }

        public int getB() {
            return b;
        }
    }

    @Test
    public void testToEqualsExclude() {
        TestObjectEqualsExclude one = new TestObjectEqualsExclude(1, 2);
        TestObjectEqualsExclude two = new TestObjectEqualsExclude(1, 3);

        assertFalse(EqualsBuilder.reflectionEquals(one, two));

        one = new TestObjectEqualsExclude(1, 2);
        two = new TestObjectEqualsExclude(2, 2);

        assertTrue(EqualsBuilder.reflectionEquals(one, two));
    }

}

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