A question of JTest.

[Michael Zhang]

Hello.
Give:
class Test4 {

class Inner {
void test() {
if (Test4.this.flag); {
sample();
}
}
}

private boolean flag = false;

public void sample() {
System.out.println("Sample");
}
public Test4() {
(new Inner()).test();
}
public static void main(String args []) {
new Test4();
}
}
1) Prints out "Sample"
2) Program produces no output but terminates correctly.
3) Program does not terminate.
4) The program will not compile
I thought the answer is 2), but when I run these codes, the result is 1), why?

[chi Lin]

Michael,
The trick is on the ";" after the if statement which terminates the if clause there, so the sample() got invoked regardless flag status,
if you remove the ";" after the if statement, the result would be (2).
regards

Originally posted by Michael Zhang:
Hello.
Give:
class Test4 {

class Inner {
void test() {
if (Test4.this.flag); {
sample();
}
}
}

private boolean flag = false;

public void sample() {
System.out.println("Sample");
}
public Test4() {
(new Inner()).test();
}
public static void main(String args []) {
new Test4();
}
}
1) Prints out "Sample"
2) Program produces no output but terminates correctly.
3) Program does not terminate.
4) The program will not compile
I thought the answer is 2), but when I run these codes, the result is 1), why?

[Michael Zhang]

Thanks chichih.