public void displayHint(final int num){
		display.syncExec(new Runnable() {
			
			@Override
			public void run() {
				switch (num) {
				case 1:
					hint.setText("Hint: UP");
					break;
				case 2:
					hint.setText("Hint: DOWN");
					break;
				case 3:
					hint.setText("Hint: RIGHT");
					break;
				case 4:
					hint.setText("Hint: LEFT");
					break;
				default:
					break;
				}
			}
		});
	}