return_Keyword

拼搏现实的明天。 2021-11-04 13:54 265阅读 0赞

## return Java Keyword with Examples ##

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