Huang Shanshan --java eighth time job

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.

Code:

/ ** JvXing class (class rectangle): member defines three variables, length a, width B, C circumference, a public authority getzhouchang find the circumference type method.

Zheng class (class square): JvXing is a subclass of class defines two member variables edge length d, Area area, a square area demand method, a method of rewriting request perimeter.

Test the main class: create a square object, call seeking square area and perimeter and output. * /

package cn.edu.ccut.po;
import java.util.*;
class JvXing{
    double a;
    double b;
    double c;
    public double getzhouchang(double a,double b){
        c=(a+b)*2;
        return c;
    }
}

class Zheng extends  JvXing{
    double d;
    double area;
    double getarea(double d){
        area= d*d;
        return Area; 
    } 
    public  Double getzhouchang ( Double C, Double D) { 
        
        return . 4 * D; 
    } 
} 
public  class the Test { 

  public  static  void main (String [] args) { 
        Scanner R & lt = new new Scanner (the System.in); 
        the System. Out.println ( "enter a square side length:" );
         Double D = r.nextDouble (); 
        Zheng Z = new new Zheng (); 
        System.out.println ( "area of the square:" + z.getarea (D)) ;
        System.out.println ( "square perimeter:" + z.getzhouchang (D, D)); 
        

    } 

}

Run shot