Java Operators in Java: Complete Beginner Guide (With Examples)

Java Operators: Doing Math and Logic in Java

In our previous post, we learned about Java Variables and Data Types and how to store values like numbers, text, and true/false.

Now it’s time to learn how to work with those values. That’s where operators come in.

Operators are special symbols in Java that allow you to perform:

• ✅ Math operations
• ✅ Comparisons
• ✅ Logical checks
• ✅ Increment / Decrement
• ✅ Assignments

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1) Arithmetic Operators

These operators are used for basic math.

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

Example

public class ArithmeticOperators {
    public static void main(String[] args) {

        int a = 10;
        int 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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2) Assignment Operators

Assignment operators are used to assign values to variables.

Operator	Meaning	Example
=	Assign	x = 10
+=	Add and assign	x += 5
-=	Subtract and assign	x -= 5
*=	Multiply and assign	x *= 5
/=	Divide and assign	x /= 5

Example

public class AssignmentOperators {
    public static void main(String[] args) {

        int x = 10;

        x += 5;
        System.out.println("After += : " + x);

        x -= 3;
        System.out.println("After -= : " + x);

        x *= 2;
        System.out.println("After *= : " + x);

        x /= 4;
        System.out.println("After /= : " + x);
    }
}

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3) Comparison (Relational) Operators

Comparison operators compare two values and return true or false.

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

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4) Logical Operators

Logical operators are used to combine conditions.

Operator	Meaning	Example
&&	AND (both must be true)	a > b && b > 0
||	OR (at least one must be true)	a > b || b > 0
!	NOT (reverse the result)	!isTrue

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5) Increment and Decrement Operators

These operators are used to increase or decrease values by 1.

Operator	Meaning	Example
++	Increase by 1	number++
--	Decrease by 1	number--

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6) Java Operators Example (All in One Program)

public class JavaOperatorsExample {
    public static void main(String[] args) {

        int a = 15;
        int b = 4;

        // Arithmetic
        System.out.println("a + b = " + (a + b));
        System.out.println("a - b = " + (a - b));
        System.out.println("a * b = " + (a * b));
        System.out.println("a / b = " + (a / b));
        System.out.println("a % b = " + (a % b));

        // Comparison
        System.out.println("a > b : " + (a > b));
        System.out.println("a == b : " + (a == b));

        // Logical
        boolean result = (a > b) && (b > 0);
        System.out.println("Logical Result: " + result);

        // Increment
        a++;
        System.out.println("After increment a = " + a);
    }
}

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Conclusion

Operators are one of the most important parts of Java because they allow you to:

• ✅ Perform calculations
• ✅ Compare values
• ✅ Write conditions
• ✅ Build logic for programs

In the next post, we will learn about Java Conditional Statements (if, else, switch) and how to make decisions in Java!