Calculate area of rectangle using class in java

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.

Also read – java program to find area of rectangle using constructor

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

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

Also read – find area of rectangle in java using method

Also read – java program to calculate area of circle using method

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