Boolean Expressions

AP Computer Science A· difficulty 3/5

Best way to check if <code> s </code> is null or empty

A
$s == null || s.length() == 0$
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B
$s == ""$
C
$s.equals(null) || s.equals("")$
D
$s.length() == 0 (NPE if null)$

Explanation

Short-circuit: check null first; works regardless of state.

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