使用类的概念编写Java程序来计算矩形的面积和周长

class ClassName
{
   //data members
   //methods
}

class Person{
   //data members
   String name;
   int age;
   String city;
   //methods
   void read(){
      System.out.println(“Reading”);
   }
}

ClassName objectname = new ClassName();

Person person_one =new Person();

Perimeter of the rectangle 
= area covered by the sides of the rectangle
= 2(l+w)
where,  l : length of rectangle
        w : width of rectangle

Area of the rectangle 
= area covered by the rectangle
=  l*w
where , l : length of rectangle
             w : width of rectangle

// Java program to calculate  the area and perimeter of a rectangle using class concept
import java.util.*;
// Rectangle Class File
class Rectangle {
    // data members
    int length, width;
    // methods
    //constructor to create Object
    Rectangle(int length, int width) {
        this. length = length;
        this.width = width;
    }
    // prints the area of rectangle
    public void area() {
        int areaOfRectangle;
        areaOfRectangle = this.length * this.width;
        System.out.println("Area of rectangle with the given input is : " + areaOfRectangle);
    }
    // prints the perimeter of rectangle
    public void perimeter() {
        int  perimeterOfRectangle;
        perimeterOfRectangle = 2 * (this.length + this.width);
        System.out.println("Perimeter of rectangle with the given input is : " + perimeterOfRectangle);
    }
}
public class Main {
    public static void main(String args[]) {
        Rectangle rect_obj = new Rectangle(10,5);  // obect creation
        System.out.println("Length = " + rect_obj.length);
        System.out.println("Width = " + rect_obj.width);
        rect_obj.area(); // returns area of rectangle
        rect_obj.perimeter(); //returns perimeter of rectangle
    }
}

Length = 10
Width = 5
Area of rectangle with the given input is : 50
Perimeter of rectangle with the given input is : 30