下面时我写的程序，本身没有问题的，请改进一下

Question

public class Demo{ public static void main(String[] args){ Rectangle re=new Rectangle(); re.seta(2.5); re.setb(2.8); re.comput(); Circle ci=new Circle(); ci.seta(2.5); ci.setb(3.5); ci.comput(); }}abstract class Shapc{ private double a; private double b; public double geta(){ return a; } public void seta(double a){ this.a=a; } public double getb(){ return b; }  public void setb(double b){ this.b=b; } public abstract void comput();}class Rectangle extends Shapc{ public void comput(){ double rectArea=geta()*getb(); double rectPerimeter=(geta()+getb())*2; System.out.println("矩形的周长:"+rectPerimeter+",矩形的面积:"+rectArea); }}class Circle extends Shapc{ public void comput(){ double cirArea=geta()*getb()*getb(); double cirPerimeter=geta()*getb()*2; System.out.println("圆形的周长:"+cirPerimeter+",圆形的面积:"+cirArea); }}

Answer 1

改进是指？代码长度？还是变量规范？