SCJP(OCPJP) 考古題解析 第４題

Given:

public void go() {
    String o = "";
    z:
    for (int x = 0; x < 3; x++) {
        for (int y = 0; y < 2; y++) {
            if (x == 1)break;
            if (x == 2 && y == 1)break z;
            o = o + x + y;
        }
    }
    System.out.println(o);
}

What is the result when the go() method is invoked?


A. 00
B. 0001
C. 000120
D. 00012021
E. Compilation fails.
F. An exception is thrown at runtime.

答案：Ｃ


解析：

Ｌａｂｅｌ迴圈ｚ

因為 break z; 

便跳出整個Ｌａｂｅｌ　ｚ的迴圈

就不會再進行 o = o + x + y了

所以最後一次印出的是２０