break,continue,goto

public class BreakDemo01 {
    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");//break只是中止循环，程序继续走
    }
}

public class ContinueDemo01 {
    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);
        }
    }
}

public class LabelDemo01 {
    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;//跳转到outer
                }
            }
            System.out.print(i+" ");
        }
    }
}

public class TestDemo01 {
    public static void main(String[] args) {
        //打印三角形 5行三角形
        for (int i = 1;i<=5;i++){
            for (int j=5;j>=i;j--){
                System.out.print(" ");
            }
            for (int j=1;j<=i;j++){
                System.out.print("*");
            }
            for (int j=1;j<i;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}
     *
    ***
   *****
  *******
 *********