Java switch和break用法

package text04;
import java.util.Scanner;
public class Text03 {
	public static void main(String[] args){
		Scanner flag=new Scanner(System.in);
		
		System.out.println("请输入一个数");
		int num1=flag.nextInt();
		  switch(num1){
		  //如果break取消了 只要满足条件会一直执行下去
	        case 1:
	        	System.out.println("星期一");
	        	break;
	        case 2:
	        	System.out.println("星期二");
	        	break;
	        case 3:
	        	System.out.println("星期三");
	        	break;
	        case 4:
	        	System.out.println("星期四");
	        	break;
	        case 5:
	        	System.out.println("星期五");
	        	break;
	        case 6:
	        	System.out.println("星期六");
	        	break;
	        case 7:
	        	System.out.println("星期天");
	        	break;
	        	default:
	        		System.out.println("输入失败");
	        		
	        }
	}
}