建立一个抽象类 Area类，两个抽象类的派生子类RectArea类和RoundArea类，以及一个实现类ImpleArea类。要求如下：
（1）抽象类Area类中只包含两个抽象方法double area();
和double girth();
（2）子类RoundArea通过覆盖父类中的抽象方法area()来求圆的面积和周长，另一子类RectArea()求长方形的面积和周长。
（3）圆的半径和长方形的长宽都定义为子类RoundArea和RectArea的域，为double类型。
（4）ImpleArea类接受键盘输入，输入长方形的长宽和圆的半径，求出圆的面积，并在屏幕上显示。
我写的不过不知道哪里错了，可以帮忙纠错一下吗？然后还有没有别的方法做这道题啊？
import java.util.Scanner;   
abstract class Area{   
      abstract double area();  
class RoundArea extends Area{
      private double r;            
      public double area(){         
          return (r*r*Math.PI);
      }   
      public double girth(){        
          return (2*Math.PI*r);     
      }
      public RoundArea(int r){
          this.r=(double)r;
      }
}

class RectArea extends Area{
     private double width;         
     private double height;
     public double area(){
         return (width*height);
     }   
     public double girth(){
     return (2*width+2*height);
     }
     public RectArea(int width,int height){
        this.width=(double)width;
        this.height=(double)height;
     }
}

public class ImpleArea{
    public void main(String[] args){
         String[] str=new String[]{"","",""};
         int[] ins=new int[3];
         for(int i=0;i<3;i++){
      try{
         @SuppressWarnings("resource")
        Scanner s=new Scanner(System.in);
         System.out.println(str[i]);
         ins[i]=s.nextInt();
         }
      catch(java.util.InputMismatchException e){
     System.out.print("");
         i--;  
     }
       }
         RoundArea roa=new RoundArea(ins[0]);
         RectArea rea=new RectArea(ins[1],ins[2]);
         System.out.println("'"+roa.area()+"','"+roa.girth()+"'");
     System.out.println(":'"+rea.area()+"','"+rea.girth()+"'");
      
    }
}
}

注意你的大括号的位置

import java.util.Scanner;   
abstract class Area{   
      abstract void area();  
      abstract void girth();
}
class RoundArea extends Area{ 
    
    private double r;  
    
    public double getR() {
        return r;
    }
    public void setR(double r) {
        this.r = r;
    }
              
      public void area(){         
          System.out.println("圆的的面积是： "+ (r*r*Math.PI));
      }    
      public void girth(){        
          System.out.println("圆的的周长是： "+(2*Math.PI*r));     
      }
}

class RectArea extends Area{
     private double width;         
     private double height;
     public void area(){
         System.out.println("矩形的面积是： "+(width*height));
     }    
     public void girth(){
     System.out.println(" 矩形的周长是： "+(2*width+2*height));
     }
    public double getWidth() {
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    public double getHeight() {
        return height;
    }
    public void setHeight(double height) {
        this.height = height;
    }
}

public class ImpleArea{
    RoundArea round;
    RectArea  rect;
    Scanner s;
    public ImpleArea(){
        s=new Scanner(System.in);
        round =new RoundArea();
        rect =new  RectArea();
    }
    
    public void PutInR(){
          System.out.println("请输入圆的半径");
          round.setR(s.nextDouble());
    }
    public void PutInWh(){
        System.out.println("请输入矩形的高");
        rect.setHeight(s.nextDouble());
        System.out.println("请输入矩形的宽");
        rect.setWidth(s.nextDouble());    
    }
    public static  void main(String[] args){
         ImpleArea ia=new ImpleArea();
         ia.PutInR();
         ia.round.area();
         ia.round.girth();
         ia.PutInWh();
         ia.rect.area();
         ia.rect.girth();
    }
}