for循环与while循环组合使用

适用于内层while循环中的产生的某个条件依赖于外部的for循环

例子如下

public class Test {
     public static void main(String[] args) throws InterruptedException {
          Random rand = new Random();
          int[] str = {1,2,3,4};
          for(int i=0;i<str.length;i++){
          System.out.println("跳出while循环"+str[i]);
          E:while(true){
         Thread.sleep(2000);
          int j = rand.nextInt(str[i]+1);
          System.out.println("j"+j);
          switch (j) {
          case 1:
               System.out.println(str[i]);
               break E;
          case 2:
               System.out.println(str[i]);
                break;
          case 3:
                System.out.println(str[i]);
                break E;
          default:
               break;
           }
       }
    }
  }
}