由于是英语学渣。大家凑合看拼英。

//以下是父类

package com.imoocc;

public abstract class tuxing {
 public double chang=5;
 public double kuang=4;
 public double banjing=10;
public abstract void zhouchang();
public abstract void mianji();
}

//以下是子类

package com.imoocc;

public abstract class juxing extends tuxing {

 @Override
 public void zhouchang() {
  // TODO Auto-generated method stub
  
  double zhouchang=(chang+kuang)*2;
 System.out.println("矩形的周长是:"+zhouchang);
 }

 @Override
 public void mianji() {
  // TODO Auto-generated method stub
     double mianji=chang*kuang;
    System.out.println("矩形的面积是:"+mianji);
 }

}

//以下是子类

package com.imoocc;

public abstract class yuanxing extends tuxing {

 @Override
 public void zhouchang() {
  // TODO Auto-generated method stub
   double zhouchang=2*3.14*banjing;
 System.out.println("圆形的周长是:"+zhouchang);
 }

 @Override
 public void mianji() {
  // TODO Auto-generated method stub
   double mianji=3.14*(banjing*banjing);
 System.out.println("圆形的面积是:"+mianji);
 }

}

//以下是测试类

package com.imoocc;

public class ceshi {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
     tuxing a=new juxiang ();
 }

}

写到测试类的时候这句指定对象的时候eclipse报错了，报的是juxiang cannot be resolved to a type

想问一下哪里是有错误的，找了好久没找出来，谢谢