break，continue，goto

package com.wang.struct;

public class BreakDemo {
    public static void main(String[] args) {
        int i=0;
        while (i<100){
            i++;
            System.out.println(i);
            if (i==30){
                break;
            }
        }
    }
}

package com.wang.struct;

public class ContinueDemo {
    public static void main(String[] args) {
        int i=0;
        while (i<100){
            i++;
            if (i%10==0){
                System.out.println("w");
                continue;//用于终止某一次循环

            }
            System.out.println(i);
        }
    }
}

package com.wang.struct;

public class LabelDemo {
    public static void main(String[] args) {
        //打印101~150之间的质数
        int count=0;
        outer:for (int i=101;i<=150;i++){
            for (int j=2;j<i/2;j++){
                if(i%j==0){
                    continue outer;
                }
            }
            System.out.println(i);
        }
    }
}