Single & does not short-circuit; replace with && to avoid NullPointerException

Compound Boolean Expressions

AP Computer Science A· difficulty 3/5

if (s != null & s.length() > 0) {
    System.out.println(s);
}

What is wrong?

A
$Nothing is wrong$
B
$length() should be length$
C
$Single & does not short-circuit; replace with && to avoid NullPointerException$
check_circle
D
$& should be |$

Explanation

The bitwise & evaluates both operands. When s is null, s.length() throws NullPointerException; && short-circuits and avoids the call.

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