Compound Boolean Expressions

AP Computer Science A· difficulty 4/5

String s = null;
if (s != null && s.length() > 0) {
    System.out.println("non-empty");
} else {
    System.out.println("empty or null");
}

What is printed?

Explanation

Short-circuit evaluation: s != null is false, so s.length() is never evaluated and no NPE occurs; the else branch runs.

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