Discussion
What will be the output of the program?
interface Count
{
short counter = 0;
void countUp();
}
public class TestCount implements Count
{
public static void main(String [] args)
{
TestCount t = new TestCount();
t.countUp();
}
public void countUp()
{
for (int x = 6; x>counter; x--, ++counter) /* Line 14 */
{
System.out.print(" " + counter);
}
}
}
Answer: E
Correct answer: Compilation fails
Every field declared in an interface is implicitly public static final, so counter is a constant. The loop’s ++counter attempts to assign to it, which the compiler rejects. The comparison x>counter would have been perfectly legal - reading a constant is fine - and it is the attempt to modify it that fails.
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