class Test{
	public static void main(String args[]){
		Object o= null;
		switch (o) {
		case String s: System.out.println("case 1");
		case null: System.out.println("null case"); break;
		case Integer i: System.out.println("case 2"); break;
		default: System.out.println("default"); break;
	} 
	}
}