用抽象方法覆盖默认接口方法 [英] Overriding default interface method with abstract method

问题描述

我觉得它很奇怪，想知道它是否是经常使用的东西.什么时候有用?

I find it weird and was wondering if it is something that is regularly used. When can it be useful?

public interface InterA { 
   Object getInfo() throws Exception1; 
}
public interface InterB {
   public default Integer getInfo(Object s) {return 67;} 
}

public interface InterC extends InterA, InterB {
   @Override public abstract Integer getInfo(Object s);
}

推荐答案

它存在于默认接口方法之前.例如，一个抽象类可以使

This exists before default interface methods. For example, an abstract class can make

    @Override
    abstract public int hashCode();

强制子类提供 hashCode 的实现，可能是因为抽象类强加了额外的要求.

forcing subclasses to provide implementations for hashCode, possibly because of additional requirements imposed by the abstract class.

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