一个接口可以在 Java 中扩展多个接口吗? [英] Can an interface extend multiple interfaces in Java?

问题描述

一个接口可以在Java中扩展多个接口吗?此代码在我的 IDE 中显示有效，并且可以编译:

Can an interface extend multiple interfaces in Java? This code appears valid in my IDE and it does compile:

interface Foo extends Runnable, Set, Comparator<String> { }

但我听说Java中不允许多重继承.为什么会出现接口异常?

but I had heard that multiple inheritance was not allowed in Java. Why does there appear to be an exception for interfaces?

推荐答案

是的，你可以做到.一个接口可以扩展多个接口，如下所示:

Yes, you can do it. An interface can extend multiple interfaces, as shown here:

interface Maininterface extends inter1, inter2, inter3 {  
  // methods
}

一个类也可以实现多个接口.如果两个接口有一个定义相同名称和签名的方法怎么办?

A single class can also implement multiple interfaces. What if two interfaces have a method defining the same name and signature?

有一个棘手的问题:

interface A {
    void test();
}

interface B {
    void test();
}

class C implements A, B {

    @Override
    public void test() {

    }     

}

然后单个实现适用于两者:)

Then single implementation works for both :).

在此处阅读我的完整帖子:

Read my complete post here:

http://codeinventions.blogspot.com/2014/07/can-interface-extend-multiple.html

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