Object Oriented (4) square perimeter and area

Title: writing an application, create a rectangle class, a class with a long, wide two member variables and methods find the circumference. Then create a subclass of the class of rectangular - square classes, methods defined in the class seeking area, find the circumference rewriting method. In the main class, the input side length of a square, a square object is created, the square area and perimeter requirements. (Note: all classes are in a package)

First, the source

/ ** find the area and perimeter of the square 
 * two classes four methods 
 * / 
Package W24;
 Import java.util.Scanner;
 class Rectangle { // a rectangular type 
    int length, Wide; // having a length and width two member variable 
    int girth () { // method find the circumference of the 
        return (length + Wide) * 2 ; 
    } 
} 
class square the extends rectangle { // subclass of a class of rectangular - square type 
    int Area () { // find the method area 
        return length * length; 
    } 
    int girth () { // method to find the circumference rewritable
        return length *. 4 ; 
    } 
    public  static  void main (String [] args) { 
        Scanner Reader = new new Scanner (the System.in); // input length and width 
        System.out.println ( "Please enter the side of the square" ); 
        Z square = new new square (); // Create square objects 
        z.length = reader.nextInt (); 
        System.out.println ( "square area" + z.area () + "square perimeter" + Z. girth ()); 
    } 
}

Second, the success Screenshots