Java基础，接口
当我们实现某个接口时，必须重写其所有方法，但是一下程序么有实现 CanFight接口的void fight()方法，程序么有问题

interface CanFight {void fight();}
interface CanFly {void fly();}
interface CanSwim {void swim();}
class ActionCharacter {public void fight(){}}
class Hero extends ActionCharacter implements CanFight, CanFly, CanSwim {

@Override
public void swim() {}

@Override
public void 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);
}
} Java基础??接口
[解决办法]
interface CanFight {void fight();}
interface CanFly {void fly();}
interface CanSwim {void swim();}
class ActionCharacter {public void fight(){}}
class Hero extends ActionCharacter implements CanFight, CanFly, CanSwim {
[解决办法]
因为它的父类已经实现过了。。。
子类继承父类的时候会继承父类已有的所有方法。