for (initialization; condition; update) {
    // 循環(huán)體
}

for (int i = 0; i < 10; i++) {
    System.out.println(i);
}

while (condition) {
    // 循環(huán)體
}

int i = 0;
while (i < 10) {
    System.out.println(i);
    i++;
}

do {
    // 循環(huán)體
} while (condition);

int i = 0;
do {
    System.out.println(i);
    i++;
} while (i < 10);

for (type var : array) {
    // 循環(huán)體
}

int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
    System.out.println(num);
}

   //正常是
        //1次循環(huán)跳出
        for (int i = 0; i < 10; i++) {
            if(i == 3){
                break;
            }
            System.out.println(i);
        }

        //2次循環(huán);一些情況需要兩次判斷才能跳出循環(huán)，得到自己想要的結(jié)果
        int k = 1;
        for (int i = 0; i < 2; i++) {
            for(int j = 0; j < 5; j++){
                k++;
                if(k > 5){  //應(yīng)該是6
                    break;
                }
            }
            if(k > 5){  //應(yīng)該是6
                break;
            }
        }
        System.out.println(k);

        k = 1;
//使用標號來表示當前循環(huán)代碼塊
        ok:
        for (int i = 0; i < 2; i++) {
            for(int j = 0; j < 5; j++){
                k++;
                if(k > 5){  //應(yīng)該是6
                    break ok;
                }
            }
        }

        System.out.println(k);