area of a rectangle code example

Example 1: Calculate area of rectangle using default constructor in java

import java.util.*;
class RectangleShape 
{
   int area, length, breadth; 
   RectangleShape() 
   { 
      length = 50; 
      breadth = 20; 
   } 
   void getArea() 
   { 
      area = length * breadth; 
      System.out.println("Area of Rectangle : " + area); 
   }  
}
public class RectangleAreaConstructor
{
   public static void main(String[] args) 
   {
      RectangleShape rs = new RectangleShape(); 
      rs.getArea();
   }
}

Example 2: Java program to calculate area of rectangle

import java.util.Scanner;
public class RectangleArea
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter length of rectangle: ");
      double length = sc.nextDouble();
      System.out.println("Please enter width of rectangle: ");
      double width = sc.nextDouble();
      double area = length * width;
      System.out.println("Area of rectangle is: " + area);
      sc.close();
   }
}

Example 3: area of square

Area of square = Length (or width, whichever) to the power of 2

Example 4: area of rectangle

Area of rectangle = Length * Width