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