switch 方法的问题

public class SwitchTest{
	
	
	public static void f(int i){
	
		switch(i){ // No't Long and String
		
			case 1:
				System.out.println("case1");
			case 2:
				System.out.println("case2");
					break;
			case 3:
				System.out.println("case3");
			default:
				System.out.println("default");
		}
	}
	
	public static void main(String[] args){
		f(1);
		//output:
		//case1
		//case2
		f(3);
		//output:
		//case3
		//default
	}
}