public interface Human {//会说话public void talk();//会笑public void laugh();//会哭public void cry();}

然后呢定义人种，首先是黑种人

public class BlockHuman implements Human{@Overridepublic void talk() {System.out.println("黑种人会说话！");}@Overridepublic void laugh() {System.out.println("黑种人会笑！");}@Overridepublic void cry() {System.out.println("黑种人会哭！");}
}

public class WhiteHuman implements Human{@Overridepublic void talk() {System.out.println("白种人会说话！");}@Overridepublic void laugh() {System.out.println("白种人会笑！");}@Overridepublic void cry() {System.out.println("白种人会哭！");}
}

最后是黄种人

public class YellowHuman implements Human{@Overridepublic void talk() {System.out.println("黄种人会说话");}@Overridepublic void laugh() {System.out.println("黄种人会笑！");}@Overridepublic void cry() {System.out.println("黄宏人会哭！");}
}

这个时候我们需要一个太上老君的炉子，没有炉子烤不熟人嘛。

public class HumanFactory {public static Human createHuman(Class a){Human human = null;try {human = (Human)Class.forName(a.getName()).newInstance();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}return human;}
}

好了，这个时候女娲开始入场造人了。

public class NvWa {public static void main(String[] args) {//先来一堆白人System.out.println("白人来咯：");Human whiteHuman = HumanFactory.createHuman(WhiteHuman.class);whiteHuman.cry();whiteHuman.laugh();whiteHuman.talk();//再来一堆黑人System.out.println("黑人来咯：");Human blockHuman = HumanFactory.createHuman(BlockHuman.class);blockHuman.talk();blockHuman.laugh();blockHuman.cry();//最后来一批黄种人System.out.println("黄种人来咯：");Human yellowHuman = HumanFactory.createHuman(YellowHuman.class);yellowHuman.cry();yellowHuman.laugh();yellowHuman.talk();}
}