Java Programming Lesson 3 | Operators in Java Tutorial

 LESSON-3: OPERATORS

Welcome to Lesson-3: Operators in Java 👨‍💻✨

📘 Lesson 3 — Operators (Arithmetic, Logical, Relational)

Operators → Symbols used to perform operations on data.

Example:

a + b

Here + is an operator

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✅ 1️⃣ Arithmetic Operators

Used for math operations:

Operator	Meaning	Example
+	Addition	a + b
-	Subtraction	a - b
*	Multiplication	a * b
/	Division	a / b
%	Modulus (remainder)	a % b

✅ Example Code:

public class ArithmeticExample {
    public static void main(String[] args) {
        int a = 10, b = 3;

        System.out.println("Addition: " + (a + b));
        System.out.println("Subtraction: " + (a - b));
        System.out.println("Multiplication: " + (a * b));
        System.out.println("Division: " + (a / b));
        System.out.println("Remainder: " + (a % b));
    }
}

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✅ 2️⃣ Relational / Comparison Operators

Used to compare values → Output: true / false

Operator	Meaning	Example
==	Equal to	a == b
!=	Not equal	a != b
>	Greater than	a > b
<	Less than	a < b
>=	Greater or equal	a >= b
<=	Less or equal	a <= b

✅ Example:

int a = 10, b = 20;
System.out.println(a > b); // false

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✅ 3️⃣ Logical Operators

Used in conditions (true or false)

Operator	Meaning	Example
&&	AND	(age > 18 && age < 30)
`		`
!	NOT	!(isStudent)

✔ Logical AND → both true
✔ Logical OR → any one true
✔ NOT reverses truth

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✅ Full Practical Example

public class OperatorsExample {
    public static void main(String[] args) {
        
        int x = 15, y = 10;

        System.out.println("x + y = " + (x + y));
        System.out.println("x > y: " + (x > y));
        System.out.println("x == y: " + (x == y));
        System.out.println("Logical AND (x>10 && y<20): " + (x > 10 && y < 20));
    }
}

✅ Output:

x + y = 25
x > y: true
x == y: false
Logical AND (x>10 && y<20): true

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🧠 Bonus: Increment / Decrement Operator

Operator	Meaning
++	Add 1
--	Subtract 1

int a = 5;
a++;    // a = a + 1 => 6
a--;    // a = 5

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📝 Exercise for You (Try Now ✅)

Write a program:

Input:

a = 50
b = 20

Output must show:

✅ Sum
✅ Difference
✅ a > b ?
✅ a == b ?
✅ (a > 30 AND b < 25)

Reply with your code + result
I will check and grade it ✅

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🎯 Quick Quiz

1️⃣ Which operator gives remainder?
A) /
B) %
C) *

2️⃣ Which operator returns TRUE only when both conditions are TRUE?
A) &&
B) ||
C) !

Reply like:
1 → ?, 2 → ?

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✅ Lesson-3 Complete!

Reply with:
✅ Exercise code
✅ Quiz answers

➡ and then we go to Lesson-4: Conditional Statements (if, else, switch) 🚀

▶ NEXT PART - Lesson-4: Conditional Statements