ArraysEquals.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. 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.
 *
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package org.openjdk.bench.java.util;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

/**
 * Tests for Array.equals() with 80 entry arrays differing at beginning, middle, or end.
 */
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
public class ArraysEquals {

    public char[] testCharArray1 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789a".toCharArray();
    public char[] testCharArray2 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789b".toCharArray();
    public char[] testCharArray3 = "123456789012345678901234567890123456789a123456789012345678901234567890123456789b".toCharArray();
    public char[] testCharArray4 = "1234567890a2345678901234567890123456789a123456789012345678901234567890123456789b".toCharArray();
    public char[] testCharArray5 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789a".toCharArray();
    public byte[] testByteArray1 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789a".getBytes();
    public byte[] testByteArray2 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789b".getBytes();
    public byte[] testByteArray3 = "123456789012345678901234567890123456789a123456789012345678901234567890123456789b".getBytes();
    public byte[] testByteArray4 = "1234567890a2345678901234567890123456789a123456789012345678901234567890123456789b".getBytes();
    public byte[] testByteArray5 = "1234567890123456789012345678901234567890123456789012345678901234567890123456789a".getBytes();

    /** Char array tests */

    @Benchmark
    public boolean testCharTrue() {
        return Arrays.equals(testCharArray1, testCharArray5);
    }

    @Benchmark
    public boolean testCharFalseEnd() {
        return Arrays.equals(testCharArray1, testCharArray2);
    }

    @Benchmark
    public boolean testCharFalseMid() {
        return Arrays.equals(testCharArray1, testCharArray3);
    }

    @Benchmark
    public boolean testCharFalseBeginning() {
        return Arrays.equals(testCharArray1, testCharArray4);
    }

    /** Byte arrays tests */
    @Benchmark
    public boolean testByteTrue() {
        return Arrays.equals(testByteArray1, testByteArray5);
    }

    @Benchmark
    public boolean testByteFalseEnd() {
        return Arrays.equals(testByteArray1, testByteArray2);
    }

    @Benchmark
    public boolean testByteFalseMid() {
        return Arrays.equals(testByteArray1, testByteArray3);
    }

    @Benchmark
    public boolean testByteFalseBeginning() {
        return Arrays.equals(testByteArray1, testByteArray4);
    }
}