异常与 throws 子句不兼容的原因是什么?

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谁能告诉我异常可能有什么原因，与throws"子句不兼容

Can anyone tell me what reasons exceptions can have, not to be compatible with "throws" clauses

例如:

class Sub extends Super{ @Override void foo() throws Exception{ } } class Super{ void foo() throws IOException{ } }

Exception Exception 与 Super.foo() 中的 throws 子句不兼容

推荐答案

没有完整的代码示例，我只能猜测:你在子类中重写/实现了一个方法，但是子类方法的异常规范不兼容与(即不是超类/接口方法的子集)?

Without a full code sample, I can only guess: you are overriding/implementing a method in a subclass, but the exception specification of the subclass method is not compatible with (i.e. not a subset of) that of the superclass/interface method?

如果声明基方法根本不抛出异常，或者例如java.io.IOException(它是您的方法试图在这里抛出的 java.lang.Exception 的子类).基类/接口的客户端希望其实例遵守基方法声明的契约，因此从该方法的实现中抛出 Exception 会破坏契约(并且 LSP).

This can happen if the base method is declared to throw no exceptions at all, or e.g. java.io.IOException (which is a subclass of java.lang.Exception your method is trying to throw here). Clients of the base class/interface expect its instances to adhere to the contract declared by the base method, so throwing Exception from an implementation of that method would break the contract (and LSP).