在Java中只能繼承一個類，但是可以繼承多個介面。常常使用繼承單個類和整合多個介面的方式實現類的多重繼承。

如下是多重繼承示例：

interface CanFight{
    void fight();
}
interface CanSwim{
    void swim();
}
interface CanFly{
    void fly();
}
class ActionCharacter{
    public void fight(){
        System.out.println("I can fight!");
    }
}
class Hero extends
 
 ActionCharacter implements CanFight,CanSwim,CanFly{
    public void swim(){
        System.out.println("I can swim!");
    }
    public void fly(){
        System.out.println("I can fly!");
    }
}
public class Adventure {
    public static void t(CanFight x){x.fight();}
    public static void u(CanSwim x){x.swim();}
    public
 
 static void v(CanFly x){x.fly();}
    public static void w(ActionCharacter x){x.fight();}
    public static void main(String[] args){
        Hero h=new Hero();
        t(h);
        u(h);
        v(h);
        w(h);
    }
}

執行結果：

I can fight!
I can swim!
I can fly!
I can fight!