Java Arithmetic Assingment Operators

Arithmetic assignment operators are shorthand operators in Java that combine arithmetic operations and assignments in a single step.

Suppose you want to increase the value of a variable by 1:

public class Main {
    public static void main(String[] args) {
        int counter = 10;
        counter = counter + 1;

        System.out.println(counter);  // Output: 11
    }
}

This code adds 1 to the value of i and assigns the updated value back to the i variable.

In such cases, you can use arithmetic assignment operators to make the operation clearer and more concise:

public class Main {
    public static void main(String[] args) {
        int counter = 10;
        counter += 1;

        System.out.println(counter);  // Output: 11
    }
}

Here, the += operator adds 1 to the variable i and updates its value.

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List of Arithmetic Assignment Operators

Java supports arithmetic assignment operators for all standard arithmetic operators. Here's the summary:

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Let's see some of these operators in practice.

Example: Subtraction with -= Operator

public class Main {
    public static void main(String[] args) {
        int total = 20;
        total -= 5;  // Equivalent to: total = total - 5;

        System.out.println(total);  // Output: 15
    }
}

Example: Division with /= Operator

public class Main {
    public static void main(String[] args) {
        int value = 50;
        value /= 5;  // Equivalent to: value = value / 5;

        System.out.println(value);  // Output: 10
    }
}

Example: Division with %= Operator

public class Main {
    public static void main(String[] args) {
        int number = 29;
        number %= 4;  // Equivalent to: number = number % 4;

        System.out.println(number);  // Output: 1
    }
}