缺少方法体，或声明抽象 [英] Missing Method body, or declare abstract

问题描述

我收到此错误消息：

线程main中的异常java.lang.RuntimeException：无法编译的源代码 - 错误的sym类型：Pet.saySomething
at PetTest.main（PetTest.java:18）
Java结果：1

以下是我所拥有的：对于说出类，

  public class Speak {
 public void saySomething（）; 
} 
  

以下是我在 PetTest中的内容 class：

  import java.util.ArrayList; 
 
公共类PetTest {
 
 public static void main（String [] args）
 {
 ArrayList< Pet> myPets = new ArrayList< Pet>（）; 
 
 myPets.add（新鹦鹉（老板））; 
 myPets.add（新猫（奥利奥））; 
 myPets.add（new Dog（Riley））; 
 
 for（Pet p：myPets）
 {
 p.saySomething（）; 
 System.out.println（p）; 
} 
} 
} 
  

我没有发布其他的与此计划一起使用的5个班级。我知道有一些东西需要在 Speak 类中修复，但我被卡住了。在 Speak 类中，在的行上显示public void saySomething（）; 它表示Missing Method正文，或声明这是其他课程：

抽象类Pet {

String name;

public Pet（String name）{
this.name = name;
}
}

公共类Parrot extends Bird {

public Parrot（String name）
{
super（name ）;
}

@Override
public void saySomething（）
{
System.out.println（Pauly想要一个craker？）;
}

@Override
public String toString（）
{
返回你好，我是+名字+鹦鹉。;
}

}


公共类Dog extends Pet {

public Dog（String name）
{
super（姓名）;
}

@Override
public void saySomething（）
{
System.out.println（Ruff，ruff！）;
}

@Override
public String toString（）
{
返回Hello，I'm+ name +the dog。;
}
}


公共类Cat延伸宠物{

公共猫（字符串名称）
{
super（姓名）;
}

@Override
public void saySomething（）
{
System.out.println（Meow。）;
}

@Override
public String toString（）
{
返回Hello，I'm+ name +the cat。;
}
}

公共类Bird extends Pet {

public Bird（String name）
{
super（name ）;
}

public void saySomething（）{}

}

解决方案

Speak有以下选择，请选择：

1st

  public abstract class Speak {
 
 public abstract void saySomething（）; 
 
} 
  

2nd

  public class Speak {
 
 public void saySomething（）{
 
} 
} 
  

第3次

  public interface Speak {
 
 public void saySomething（）; 
} 
  

编辑：首先，你不是在任何地方使用Speak类。其次，请在Pet类中添加以下方法：

  public abstract void saySomething（）; 
  

I am getting this error message:

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: Pet.saySomething at PetTest.main(PetTest.java:18) Java Result: 1

Here is what i have: for the Speak class,

public class Speak {
   public void saySomething();
}

Here is what i have in the PetTest class:

 import java.util.ArrayList;

 public class PetTest {

     public static void main(String[] args)
     {
         ArrayList<Pet> myPets = new ArrayList<Pet>();

         myPets.add(new Parrot("Boss"));
         myPets.add(new Cat("Oreo"));
         myPets.add(new Dog("Riley"));

         for (Pet p: myPets)
         {
             p.saySomething();
             System.out.println(p);
         }
     }
 }

I did not post the other 5 classes that go with this program. I know there is something that needs to be fixed in the Speak class, but i am stuck. In the Speak class, on the line that says public void saySomething(); it says Missing Method body, or declare abstract.

EDIT: Here are the other classes:

 public abstract class Pet {

     String name;

     public Pet(String name){
         this.name = name;
     }
 }

 public class Parrot extends Bird {

     public Parrot (String name)
     {
         super(name);
     }

     @Override
     public void saySomething()
     {
         System.out.println("Pauly want a craker?");
     }

     @Override
     public String toString()
     {
         return "Hello, I'm " + name + " the parrot.";
     }

 }


 public class Dog extends Pet {

     public Dog (String name)
     {
         super(name);
     }

     @Override
     public void saySomething()
     {
         System.out.println("Ruff, ruff!");
     }

     @Override
     public String toString()
     {
         return "Hello, I'm " + name + " the dog.";
     }
 }


 public class Cat extends Pet {

     public Cat(String name)
     {
         super(name);
     }

     @Override
     public void saySomething()
     {
    System.out.println("Meow.");
     }

     @Override
     public String toString()
     {
         return "Hello, I'm " + name + " the cat.";
     }
 }

 public class Bird extends Pet {

     public Bird(String name)
     {
         super(name);
     }

     public void saySomething(){}

 }

解决方案

You have the following options for Speak, take your pick:

1st

public abstract class Speak{

   public abstract void saySomething();

}

2nd

public class Speak{

   public void saySomething(){

   }
}

3rd

public interface Speak{

   public void saySomething();
}

Edit: First of all, you are not using Speak class anywhere. Second, please add the following method in Pet class:

 public abstract void saySomething();

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