如何从Java中继承多个基类？ [英] How to inherit from multiple base classes in Java?

问题描述

可能重复：

在Java中作弊单继承!!

为什么Java或C＃中不允许多重继承？

java中的多重继承。

我知道我们可以使用接口继承来自多个类但是是否也可以继承状态？

如何从2个类继承带有定义的方法并将它们放在Java的第三个类中？

I know that we can use interfaces to inherit from multiple classes but is it possible to inherit the state as well?
How can I inherit methods with definitions from 2 classes and have them in a third class in Java?

推荐答案

Java中不允许多重继承。请改为使用委托和接口

Multiple inheritance is not allowed in Java. Use delegates and interfaces instead

public interface AInterface {
        public void a();
}
public interface BInterface {
    public void b();
}

public class A implements AInterface {
    public void a() {}
}
public class B implements BInterface {
    public void b() {}
}

public class C implements AInterface, BInterface {
    private A a;
    private B b;

    public void a() {
        a.a();
    }
    public void b() {
        b.b();
    }
}

从Java 8开始，可以使用默认方法。

Since Java 8 it's possible to use Default Methods in Interfaces.

这篇关于如何从Java中继承多个基类？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！