工厂模式

interface Human{
    void cry();
    void laugh();
}

class Yellw implements Human{
    @Override
    public void laugh() {

    }

    @Override
    public void cry() {

    }

}

class White implements Human{
    @Override
    public void cry() {

    }

    @Override
    public void laugh() {

    }
}

class HumanFactory{
    public static Human createMan(Class c){
        Human man = null;

        try {
            man = (Human)Class.forName(c.getName()).newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        return man;
    }
}

public class Nvwa{
    public static void main(String[] args) {
        Human wman = HumanFactory.createMan(White.class);
        wman.cry();
        wman.laugh();

        Human yman = HumanFactory.createMan(Yellw.class);
        yman.cry();
        yman.laugh();

    }
}