Objects: Instances of Classes

AP Computer Science A· difficulty 4/5

To safely call <code> s.length() </code> only if s is not null

A
$if (s.length() > 0 && s != null)$
B
$Both work$
C
$Use Optional <String>$
D
$if (s != null && s.length() > 0)$
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Explanation

Order matters: null-check first.

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