Let’s learn to calculate area of rectangle using class in java.

## Calculate area of rectangle using class in java

To calculate area of rectangle in java,

- first create class “RectangleShape”. This class has two integer variables length, breadth.
- to set values for variables length and breadth setValue() method is created.
- In findArea() method we are calculating area of rectangle and in turn returning area.
- In the main() method create object of class RectangleShape.
- assign values for length and breadth. Finally calculate area by calling findArea() method.

Here’s java program to find the area of rectangle using class and object.

// calculate area of rectangle using class in java import java.io.*; class RectangleShape { int length, breadth; void setValue(int l, int b) { length = l; breadth = b; } // get area of rectangle int findArea() { return (length * breadth); } } public class RectangleAreaDemo { public static void main(String[] args) { RectangleJava obj = new RectangleJava(); obj.setValue(10, 5); System.out.println("Area of rectangle: " + obj.findArea()); } }

**Output:**

Area of rectangle: 50

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**Program to find area of rectangle using inheritance in java**

class RectangleDimension { int length; int breadth; } class Rectangle extends RectangleDimension { int area; void findArea() { area = length * breadth; } } public class AreaOfRectangleUsingInheritance { public static void main(String[] args) { Rectangle obj = new Rectangle(); obj.length = 50; obj.breadth = 20; obj.findArea(); int area = obj.length * obj.breadth; System.out.println("Area of rectangle is: " + area); } }

**Output:**

Area of rectangle is: 1000

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