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Operators & Expressions

Java Program: Logical Operator demonstration (AND, OR, NOT)

Logical Operators Used

• && → Logical AND
• || → Logical OR
• ! → Logical NOT

public class LogicalOperatorDemo {
    public static void main(String[] args) {
 
        int a = 10;
        int b = 20;
        int c = 30;
 
        System.out.println("a = " + a + ", b = " + b + ", c = " + c);
 
        // Logical AND
        System.out.println("\n(a < b && b < c): " + (a < b && b < c));
 
        // Logical OR
        System.out.println("(a > b || b < c): " + (a > b || b < c));
 
        // Logical NOT
        System.out.println("!(a < b): " + !(a < b));
    }
}

 
OUTPUT :
a = 10, b = 20, c = 30

(a < b && b < c): true
(a > b || b < c): true
!(a < b): false

Explanation

✔ 1. Logical AND (&&)

(a < b && b < c)

• Returns true only if both conditions are true
• 10 < 20 ✅ and 20 < 30 ✅
  &arr; Result = true

✔ 2. Logical OR (||)

(a > b || b < c)

• Returns true if any one condition is true
• 10 > 20 ❌
• 20 < 30 ✅
  &arr; Result = true

✔ 3. Logical NOT (!)

!(a < b)

• Reverses the boolean result
• a < b → true
• !true → false

✅ Truth Table Summary

|     A  |    B  | A && B | A || B |  !A  |
|-------|------|---------|--------|------|
| true  | true  | true    | true   | false |
| true  | false | false   | true   | false |
| false | true  | false   | true   | true  |
| false | false | false   | false  | true  |