Demonstrates deadlock between two objects calling synchronised methods of each other

SyncTest.java

public class SyncTest {

	public static Obj1 obj1;
	public static Obj2 obj2;

	public static void main(String... args) {
		obj1 = new Obj1();
		obj2 = new Obj2();
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
				while (true) {
					obj1.a(obj2);
					System.out.println("No lock yet");
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		});
		Thread t2 = new Thread(new Runnable() {
			@Override
			public void run() {
				while (true) {
					obj2.a(obj1);
					System.out.println("No lock yet");
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		});
		t1.start();
		t2.start();
	}

	public static class Obj1 {

		public synchronized void a(Obj2 other) {
			other.b(this);
		}

		public synchronized void b(Obj2 other) {
			System.out.println("Called by " + other.toString());
		}

	}

	public static class Obj2 {

		public synchronized void a(Obj1 other) {
			other.b(this);
		}

		public synchronized void b(Obj1 other) {
			System.out.println("Called by " + other.toString());
		}

	}

}