volatile test

result

# method test1() i and j are not same
......
......
i=737354065j=737354127
i=737357077j=737357138
i=737362614j=737362697
i=737365141j=737365206
i=737368404j=737368461
i=737371663j=737371723
i=737374634j=737374694
i=737376637j=737376701
i=737380045j=737380103
i=737383164j=737383223
i=737386033j=737386096
i=737391217j=737391277
i=737394546j=737394605
i=737397796j=737397859
i=737400556j=737400619
i=737402600j=737402661
i=737406018j=737406079
i=737409278j=737409338
i=737412559j=737412559
i=737414224j=737414223
i=737415229j=737415287
i=737417126j=737417181
i=737418984j=737419045
i=737420830j=737420897
i=737422739j=737422796
i=737424671j=737424727
i=737426777j=737426835
i=737428684j=737428751
i=737430719j=737430826
i=737432771j=737432827
i=737434798j=737434854
i=737436742j=737436797
i=737438702j=737438758
i=737440608j=737440667
i=737442458j=737442515
i=737444397j=737444451
i=737446518j=737446572
i=737448416j=737448470
......
......


# method test2() i and j are same
......
......
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
i=45625514j=45625514
......
......

VolatileTest.java

/*
 * Copyright (c) 2010-2011 lichengwu
 * All rights reserved.
 * 
 */
package oliver.test.sync;

import java.util.concurrent.TimeUnit;

import org.junit.Test;

/**
 * 
 * @author lichengwu
 * @created 2012-7-2
 * 
 * @version 1.0
 */
public class VolatileTest {

	@Test
	public void test1() throws InterruptedException {
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true)
					WithOutIncrease.one();

			}
		}).start();
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true)
					WithOutIncrease.two();

			}
		}).start();
		TimeUnit.SECONDS.sleep(100000000);
	}
	@Test
	public void test2() throws InterruptedException {
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true)
					WithIncrease.one();

			}
		}).start();
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true)
					WithIncrease.two();

			}
		}).start();
		TimeUnit.SECONDS.sleep(100000000);
	}
}



class WithOutIncrease {
	static int i = 0;
	static int j = 0;

	public static void one() {
		i++;
		j++;
	}

	public static void two() {
		System.out.println("i=" + i + "j=" + j);
	}
}

class WithIncrease {
	volatile static int i = 0;
	volatile static int j = 0;

	public static void one() {
		i++;
		j++;
	}

	public static void two() {
		System.out.println("i=" + i + "j=" + j);
	}
}