ArrayEqualsBench.java

package net.tdowns;

import java.util.Arrays;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

@State(Scope.Thread)
public class ArrayEqualsBench {

	@Param({"1024", "4096", "65536"})
	int length;

	byte[] b;
	byte[] bzero;
	
	char[] c;
	char[] czero;
	
	short[] s;
	short[] szero;
	
	int[] i;
	int[] izero;
	
	long[] l;
	long[] lzero;	
	
	@Setup
	public void setup() {
		bzero = new byte[length];
		b       = new byte[length];
		b[length - 1] = 1;
		
		czero   = new char[length];
		c       = new char[length];
		c[length - 1] = 1;
		
		szero   = new short[length];
		s       = new short[length];
		s[length - 1] = 1;
		
		izero   = new int[length];
		i       = new int[length];
		i[length - 1] = 1;
		
		lzero   = new long[length];
		l       = new long[length];
		l[length - 1] = 1;
	}
	
	@Benchmark
	public boolean equalsByte() {
		return Arrays.equals(b, bzero);
	}
	
	@Benchmark
	public boolean equalsChar() {
		return Arrays.equals(c, czero);
	}
	
	@Benchmark
	public boolean equalsShort() {
		return Arrays.equals(s, szero);
	}
	
	@Benchmark
	public boolean equalsInt() {
		return Arrays.equals(i, izero);
	}
	
	@Benchmark
	public boolean equalsLong() {
		return Arrays.equals(l, lzero);
	}
}