Discussion
Which line is an inappropriate use of an assertion?
public class Sample12
{
static int served = 0;
static boolean serve()
{
served++;
return true;
}
public static void main(String[] args)
{
assert serve();
System.out.println(served);
}
}
Answer: D
serve() changes state that outlives the assertion, so the program prints 1 with -ea and 0 without it. An expression inside an assert must be free of side effects precisely so that enabling or disabling assertions cannot change what the program does.
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