YOLO

synchronized public static void threadFunc() {
		newLine = true;
		x = 0; y = 0;

		Thread t1 = new Thread(){
			@Override
			public void run() {
				while (x == 0) {
					try {
						Thread.sleep((long)0.01);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}

				System.out.print("a");
				y = 1;
				y = 0;
				System.out.print("d");
				y = 1;

				synchronized(this) {
					if (newLine) {
						System.out.print("\n");
						newLine = false;
					}
				}
			}
		};

		Thread t2 = new Thread(){
			@Override
			public void run() {
				System.out.print("b");
				x = 1;

				while (y == 0) {
					try {
						Thread.sleep((long)0.01);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}

				System.out.print("c");

				synchronized(this) {
					if (newLine) {
						System.out.print("\n");
						newLine = false;
					}
				}
			}
		};

		t1.start();
		t2.start();

		try {
			t1.join();
			t2.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}