跳出多层循环

1.标签

//i=0
//k=0
//k=1
private static void loop1() {
    for1:
    for (int i = 0; i < 3; i++) {
        System.out.println("i=" + i);
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k < 3; k++) {
                System.out.println("k=" + k);
                if (k == 1) {
                    break for1;
                }
            }
        }
    }
}

//i=0
//k=0
//k=1
//i=1
//k=0
//k=1
//i=2
//k=0
//k=1
private static void loop2() {
    for1:
    for (int i = 0; i < 3; i++) {
        System.out.println("i=" + i);
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k < 3; k++) {
                System.out.println("k=" + k);
                if (k == 1) {
                    continue for1;
                }
            }
        }
    }
}

2.外层的循环条件在内层代码控制

//i=0
//j=0
//j=1
private static void loop3() {
    boolean flag = true;
    for (int i = 0; i < 3 && flag; i++) {
        System.out.println("i=" + i);
        for (int j = 0; j < 3 && flag; j++) {
            System.out.println("j=" + j);
            if (j == 1) {
                flag = false;
            }
        }
    }
}

3.异常

//i=0
//j=0
//j=1
//--------------
private static void loop4() {
    try {
        for (int i = 0; i < 3; i++) {
            System.out.println("i=" + i);
            for (int j = 0; j < 3; j++) {
                System.out.println("j=" + j);
                if (j == 1) {
                    throw new Exception();
                }
            }
        }
    } catch (Exception e) {
        System.out.println("--------------");
    }
}

4.return

//i=0
//j=0
//j=1
private static void loop5() {
    for (int i = 0; i < 3; i++) {
        System.out.println("i=" + i);
        for (int j = 0; j < 3; j++) {
            System.out.println("j=" + j);
            if (j == 1) {
                return;
            }
        }
    }
}