多继承其实是不好的东西，但是你有时候却要用到它，那怎么办呢？可以利用接口，下面是一个简单的例子。

interface CanFly
{
 void fly();
}

interface CanSwim
{
 void swim();
}

interface CanFight
{
 void fight();
}

class ActionCharter
{
 public void fight()
 {
  System.out.println("I can fight");
 }
}

class Hero extends ActionCharter implements CanFly,CanSwim,CanFight
{
 public void swim(){
  System.out.println("I can swim");
 }
 
 public void fly(){
  System.out.println("I can fly");
 } 
}

public class HelloWorld
{
 public static void u(CanFly i){i.fly();}
 public static void v(CanSwim i){i.swim();}
 public static void w(CanFight i){i.fight();}
 public static void x(ActionCharter i){i.fight();}
 
 public static void main(String []args)
 {
  Hero hero = new Hero();
  u(hero);
  v(hero);
  w(hero);
  x(hero);
 }
 
}