IO performance comparison in java

IOPerfTest.java

import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel.MapMode;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class IOPerfTest {

	private RandomAccessFile db;

	@Before
	public void setUp() throws Exception {
		db = new RandomAccessFile("test.dat", "r");
	}

	@After
	public void tearDown() throws Exception {
		db.close();
	}

	@Test
	public void testIO() throws Exception {
		long start = System.currentTimeMillis();
		for (int i = 0; i < 1000000; i++) {
			db.read();
		}
		long end = System.currentTimeMillis();
		System.out.println("Test IO::" + (end - start) + " ms");
	}
	
	@Test
	public void testIOAll() throws Exception {
		byte[] buff = new byte[1000000];
		long start = System.currentTimeMillis();
		db.read(buff);
		long end = System.currentTimeMillis();
		System.out.println("Test IOAll::" + (end - start) + " ms");
	}

	@Test
	public void testNIO() throws Exception {
		ByteBuffer buff = db.getChannel().map(MapMode.READ_ONLY, 0, db.length());
		long start = System.currentTimeMillis();
		for (int i = 0; i < 1000000; i++) {
			buff.get();
		}
		long end = System.currentTimeMillis();
		System.out.println("Test NIO::" + (end - start) + " ms");		
	}

	@Test
	public void testNIOAll() throws Exception {
		byte[] _buff = new byte[1000000];
		ByteBuffer buff = db.getChannel().map(MapMode.READ_ONLY, 0, db.length());
		long start = System.currentTimeMillis();
		buff.get(_buff);
		long end = System.currentTimeMillis();
		System.out.println("Test NIOAll::" + (end - start) + " ms");		
	}
}

Result

Test IO::730 ms
Test IOAll::3 ms
Test NIO::8 ms
Test NIOAll::0 ms