private static void caseTest01(String[] args) {
		pl("This is a switch syntax tests");

		while (!input.equals(new String("q"))) {
		// the string equals are needed, otherwise the input != "q" is always true.
		    input = scanner.nextLine();
		    
			switch(input) {
			case "1" :
				pl("case 1: detected \"" + input +"\"");
			case "2" :
				pl("case 2: detected \"" + input +"\"");
				break;
			default:
				pl("default detected \"" + input + "\"");
			    break;
			}
		}
		pl("User end this program with input q");
	}