帮忙抄错误阿

class Member {
  private static int counter = 0;
  private int id = ++counter;
  public Member() {
    System.out.println(
      "Member constructor " + id);
  }
}

class Rodent3 {
  Member m = new Member();
  public Rodent3() {
    System.out.println("Rodent constructor");
  }
  public void hop() {
    System.out.println("Rodent hopping");
  }
  public void scurry() {
    System.out.println("Rodent scurrying");
  }
  public void reproduce() {
    System.out.println("Making more Rodents");
  }
  public String toString() {
    return "Rodent";
  }
}

class Mouse3 extends Rodent3 {
  Member m = new Member();
  public Mouse3() {
    System.out.println("Mouse constructor");
  }
  public void hop() {
    System.out.println("Mouse hopping");
  }
  public void scurry() {
    System.out.println("Mouse scurrying");
  }
  public void reproduce() {
    System.out.println("Making more Mice");
  }
  public String toString() {
    return "Mouse";
  }
}

class Gerbil3 extends Rodent3 {
  Member m = new Member();
  public Gerbil3() {
    System.out.println("Gerbil constructor");
  }
  public void hop() {
    System.out.println("Gerbil hopping");
  }
  public void scurry() {
    System.out.println("Gerbil scurrying");
  }
  public void reproduce() {
    System.out.println("Making more Gerbils");
  }
  public String toString() {
    return "Gerbil";
  }
}

class Hamster3 extends Rodent3 {
  Member m = new Member();
  public Hamster3() {
    System.out.println("Hamster constructor");
  }
  public void hop() {
    System.out.println("Hamster hopping");
  }
  public void scurry() {
    System.out.println("Hamster scurrying");
  }
  public void reproduce() {
    System.out.println("Making more Hamsters");
  }
  public String toString() {
    return "Hamster";
  }
}

public class E10_RodentInitialization
{
  public static void main(String args[])
  {
    new Hamster3();
  }
}