return Java Keyword with Examples

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The return keyword causes a method to return to the method that called it, passing a value that matches the return type of the returning method.

 Below diagram describe that the methods return int value:

return Java Keyword Example

The return keyword is used to stop the execution of a method and return a value for the caller.
Example 1: In below example, doOperation() method of AddOperation class calculate the sum and returns the integer value.
class AddOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 + num2);
    }
}
Example 2: In below example, doOperation() method of SubOperation class do subtraction and returns the integer value.
class SubOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 - num2);
    }
}
Example 3: In below example, doOperation() method of MultiplyOperation class does multiplication and returns the integer value.
class MultiplyOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 * num2);
    }
}
Example 4: In below example, doOperation() method of DivisionOperation does division operation and returns the integer value.
class DivisionOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 / num2);
    }
}

Complete Example

package com.javaguides.corejava.keywords;

public class ReturnKeyword {
    public static void main(String[] args) {
        Operations addOperation = new AddOperation();
        Operations subOperation = new SubOperation();
        Operations mulOperation = new MultiplyOperation();
        Operations divOperation = new DivisionOperation();

        int add = addOperation.doOperation(10, 20);
        System.out.println("Addition of 10 and 20 ::" + add);

        int sub = subOperation.doOperation(20, 10);
        System.out.println("Substraction between 20 and 10 :: " + sub);

        int mul = mulOperation.doOperation(10, 20);
        System.out.println("Multiply 10 and 20 :: " + mul);

        int div = divOperation.doOperation(20, 10);
        System.out.println("Division of 20 by 10 :: " + div);
    }
}

interface Operations {
    public int doOperation(int num1, int num2);
}

class AddOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 + num2);
    }
}

class SubOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 - num2);
    }
}

class MultiplyOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 * num2);
    }
}

class DivisionOperation implements Operations {

    @Override
    public int doOperation(int num1, int num2) {
        return (num1 / num2);
    }
}
Output:
Addition of 10 and 20 ::30
Substraction between 20 and 10 :: 10
Multiply 10 and 20 :: 200
Division of 20 by 10 :: 2

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