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public class SyncTest {

	private static SyncTarget target;

	@BeforeClass
	public static void init() {
		target = new SyncTarget();
		System.out.println("init");
	}

	@Test
	public void threadLockTest1() {

		for (int i = 0; i < 5; i++) {
			new Thread() {
				@Override
				public void run() {
					target.test1();
				};
			}.start();
		}
	}

	@Test
	public void threadLockTest2() {

		for (int i = 0; i < 5; i++) {
			new Thread() {
				@Override
				public void run() {
					target.test2();
				};
			}.start();
		}
	}

	@Test
	public void threadLockTest3() {

		for (int i = 0; i < 5; i++) {
			new Thread() {
				@Override
				public void run() {
					target.test3();
				};
			}.start();
		}
	}

	public static class SyncTarget {

		public void test1() {
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("test1(), threadName=" + Thread.currentThread().getName());
		}

		public synchronized void test2() {
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("test2(), threadName=" + Thread.currentThread().getName());
		}

		public synchronized void test3() {
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("test3(), threadName=" + Thread.currentThread().getName());
		}
	}
}