Java program to calculate area of rectangle code example

Example 1: Java program to find area of rectangle using function

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

Example 2: Calculate area of rectangle using class in java

// 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());
   }
}

Example 3: 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();
   }
}