Discussion
Which line is an inappropriate use of an assertion?
public class Sample52
{
static boolean verbose = false;
public static void main(String[] args)
{
assert verbose = true;
if (verbose) System.out.println("diagnostics on");
System.out.println("done");
}
}
Answer: D
This is the trick of using an assertion to detect whether assertions are enabled: the single = assigns, the assigned value is boolean so it compiles, and it passes. It works, but it makes the program behave differently under -ea by design, which is the opposite of what assertions are for, and it reads as a typo for ==.
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