Pattern Programs

Java Programs

Share with a Friend

HOME

Java Program: Demonstrate Short-Circuit Behavior in Logical Operators

Concept

Short-circuit evaluation means Java stops evaluating an expression as soon as the result is known.
Applies to:

&& (Logical AND)
|| (Logical OR)

Java

public class ShortCircuitDemo {
 
    static boolean firstCondition() {
        System.out.println("First condition evaluated");
        return false;
    }
 
    static boolean secondCondition() {
        System.out.println("Second condition evaluated");
        return true;
    }
 
    public static void main(String[] args) {
 
        System.out.println("---- AND (&&) Short-Circuit Demo ----");
 
        if (firstCondition() && secondCondition()) {
            System.out.println("Both conditions are true");
        } else {
            System.out.println("AND condition failed");
        }
 
        System.out.println("\n---- OR (||) Short-Circuit Demo ----");
 
        if (secondCondition() || firstCondition()) {
            System.out.println("At least one condition is true");
        } else {
            System.out.println("OR condition failed");
        }
    }
}

Output

 
OUTPUT :
---- AND (&&) Short-Circuit Demo ----
First condition evaluated
AND condition failed

---- OR (||) Short-Circuit Demo ----
Second condition evaluated
At least one condition is true

Explanation

1. AND (&&) Short-Circuit

if (firstCondition() && secondCondition())

Evaluation:

firstCondition() → returns false
Since AND requires both conditions to be true, Java does NOT evaluate secondCondition()
This shows short-circuit behavior

✔ Output confirms only first condition was evaluated

2. OR (||) Short-Circuit

if (secondCondition() || firstCondition())