Compound Boolean Expressions

AP Computer Science A· difficulty 4/5

<code> (s != null && s.length() > 0) </code> is safe because

A
$It's a runtime trick$
B
$Short-circuit prevents calling length() on null$
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C
$Java auto-checks null$
D
$Always throws NPE$

Explanation

If s is null, the && stops at the first part; length() is not called.

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