小白请教怎样简化？

package com.imooc;

public abstract class Shape {

public abstract double perim();

public abstract double area();

-----------------------------------------------

public class Rectangle extends Shape {

double a=5.2;

double b=2.3;

double c=0;

double d=0;

@Override

public double perim() {

c=(a+b)*2;

System.out.println("矩形的周长："+c);

return c;

// TODO Auto-generated method stub

}

@Override

public double area() {

d=a*b;

System.out.println("矩形的面积："+d);

return d;

// TODO Auto-generated method stub

-------------------------------------------------------------

public  class Circle extends Shape {

double e=3.14;

double r=2.5;

double j=0;

double i=0;

@Override

public double perim() {

j=2*e*r;

System.out.println("圆形的周长："+j);

// TODO Auto-generated method stub

return j;

}

@Override

public double area() {

i=e*r*r;

System.out.println("圆形的面积："+i);

// TODO Auto-generated method stub

return i;

}

-----------------------------------------------------

public class man {

public static void main(String[] args) {

// TODO Auto-generated method stub

       Shape pe1 = new Rectangle();

       pe1.perim();

       pe1.area();

       Shape pe2 = new Circle();

       pe2.perim();

       pe2.area();

}

--------------------------

矩形的周长：15.0

矩形的面积：11.959999999999999

圆形的周长：15.700000000000001

圆形的面积：19.625