代码和问题如下，有人能帮一下吗

Question

• public class Wolf extends Carnivore{
      public Wolf(String name,int age){
          super(name,age);
      }
      public void makeNoise(){
          System.out.println("make wolf bark");
      }
  }
  
  
  public abstract class Carnivore extends Animal{
      public Carnivore(String name,int age){
          super(name,age);
      }
      public void makeNoise(){
          
      }
      public void eat(Food type) throws Exception{
          if (type instanceof Meat){
              System.out.println("right");
          }
          else{
              throw new Exception("error");
          }
      }
  }
  
  
  
  public class Main{
      public static void main(String[] args){
          Wolf wolf1 = new Wolf("wolf",10);
          Parrot parrot1 = new Parrot("parrot",10);
          Sheep sheep1 = new Sheep("sheep",10);
          Meat meat1 = new Meat("pork");
          Plant plant1 = new Plant("grass");
          wolf1.makeNoise();
          parrot1.makeNoise();
          try{
              wolf1.eat(plant1);
              sheep1.eat(meat1);
          }
          catch(Exception e){
              System.err.println("wrong");
          }
      }
  }
  
  

  create a second Animal constructor which takes no arguments.
• call the other Animal constructor from within this second constructor, providing "newborn" and 0 (zero) as the arguments.
• test this in your main method by creating a new Wolf with zero arguments.
• you will have to create constructors with no arguments in both Wolf and Carnivore that call the super constructor.

 

Answer 1

从报错信息来看 构造函数有问题，建议上传全部代码看看