java job override perimeter square method

I, entitled

Write an application, and then create a rectangle class, a class with a long, wide two member variables and methods find the circumference.

Then create a rectangular square Subclass ----- classes, methods defined in the class seeking area, perimeter override method, in the main category, enter a side of the square, the square object is created

Square area and perimeter requirements.

Second, the source

(1) Rectangle class

Package ccut;
 / ** This is potentially a rectangular length and width, as well as methods seek rectangular perimeter * / 
public  class the Rectangle {
     Double length; // length of the rectangle 
    Double width; // rectangular wide
     // definition of peripheral method long 
    Double getPer () {
         return 2 * (length + width); 
    } 

}

(2) Square class

 

Package ccut;
 / ** This class defines the main method for finding the square area, perimeter rewriting process * / 
public  class Square the extends the Rectangle { 
          
    Double the getArea () {
         return length * length; 
    } 
     
    Double getPer () {
         return length * 4 ; 
    } 

}

(3) Test Class

 

Package ccut; 

Import java.util.Scanner; 

public  class the Test { 

    / ** 
     * such tests, a square perimeter and area 
     * / 
    public  static  void main (String [] args) { 
        Scanner Reader = new new Scanner (the System.in) ; 
        System.out.println ( "Please enter the side length of the square" );
         // create objects square 
        square sq = new new square (); 
        sq.length = reader.nextDouble ();     
        System.out.println ( "square area is: "+ sq.getArea ()); 
        System.out.println ( " square perimeter "+sq.getPer());
        

    }

}

Third, the operating results map