break,continue,goto

package com.zhao.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;
            }
        }
        System.out.println("123");
    }
}

============================================

package com.zhao.struct;

public class ContinueDemo {
    public static void main(String[] args) {
        int i = 0;
        while (i<100){
            i++;
            if (i%10==0){
                System.out.println();
                continue;
            }
            System.out.print(i);
        }
    }
}

======================================

package com.zhao.struct;

public class LabelDemo {
    public static void main(String[] args) {
        //打印101-150之间所以的质数
        //质数是指在大于1的自然数中，出了1和它本身以外不再有其他因素的自然数。
        int count = 0;
        //不建议使用
        outer:for (int i=101;i<150;i++){
            for (int j = 2;j