Java Abstract Class声明throwable - 实现不会强制执行它？(Java Abstract Class declares throwable - implementation does not enforce it? [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 抛出 4个答案的 Java抽象类 
 
 
 
 
 我想知道使用抽象类和接口之间的区别，这让我感到困惑： 
 
 假设你有一个抽象类 
 
public abstract class Animal {   
//return the tail lenght of the animal
public abstract int getTailLength() throws IllegalStateException;
}
 
 承诺抽象类的实现有一个名为getTailLength（）的方法[编译器强制扩展类为@override抽象类并实现它们]，如下所示： 
 
public Snake extends Animal(){

@override
public int getTailLength(){
  return 10;
}
}
 
 当我们声明想要getTailLenght（）的实现时，编译器在抽象类中很好，我们还提到我们希望它抛出异常 - 但在上面的片段中已被省略。 
 
 我是否认为在使用接口和“实现”声明执行相同操作时不允许这样做？ 
 
 我想因为你用@override注释方法，只要你有一个在ADT中强制执行的名称的方法，编译器就不关心你做什么了？ 它会检查返回类型，为什么不强制执行异常？ 

 
 
This question already has an answer here:
 
 
 
  
 Java abstract classes which throw  4 answers  
 
 
 
 
I was wondering about the difference between using an abstract class and interface and this puzzled me a bit:
 
Suppose you have an abstract class
 
public abstract class Animal {   
//return the tail lenght of the animal
public abstract int getTailLength() throws IllegalStateException;
}
 
that promises that implementations of the abstract class have a method called getTailLength() [compiler forces extended classes to @override the abstract class and implement them] like so:
 
public Snake extends Animal(){

@override
public int getTailLength(){
  return 10;
}
}
 
The compiler is fine with this yet in the abstract class when we declare to want an implementation of getTailLenght() we also mention that we want it to throw an exception - yet in the above snippet that has been omitted.
 
Am I right in thinking that this is not allowed when doing the same with an Interface and 'implements' declaration?
 
I suppose that because you annotate the method with @override the compiler simply doesn't care what you do as long as you have a method that has the name you enforce in the ADT? It does check for the return type, why does it not enforce the exception?

原文：https://stackoverflow.com/questions/35634702