Comprehensive Operators & Short-Circuit Evaluation

1Concept

Java short-circuit logical operators (&&, ||) evaluate the right-hand operand ONLY if the left operand does not determine the final truth value. This prevents NullPointerExceptions during chain checks.

2Architecture Diagram

Operand 1 (false) && Operand 2 (skipped!) ---> Result: false
Operand 1 (true)  || Operand 2 (skipped!) ---> Result: true

3Code Example

public class ShortCircuitDemo {
    public static void main(String[] args) {
        String text = null;
        if (text != null && text.length() > 0) {
            System.out.println(text);
        } else {
            System.out.println("Safe check: text is null, length check skipped!");
        }
    }
}

4Expected Output

Safe check: text is null, length check skipped!

5Key Takeaways

• ✓&& and || short-circuit; single & and | do NOT short-circuit.
• ✓Ternary operator requires matching return types or auto-boxing.
• ✓Assigning inside boolean conditions (if (b = true)) is a common bug.