练习

public abstract class Person {
    protected String name;
    public String getName(){
        return this.name;
    }
    //进银行取号  等待叫号
    public abstract void callNum();
    //到窗口办理业务
    public abstract void setBusiness();
    //离开银行
    public abstract void leave();
}

public class YongMan extends Person{
    public YongMan(){}
    public YongMan(String name){
        this.name = name;
    }
    public void callNum() {
        System.out.println("年轻人来到了银行，自己拿到了小票");
    }
    public void setBusiness() {
        System.out.println("年轻人熟悉银行的业务，很快就办理完了业务");
    }
    public void leave() {
        System.out.println("年轻人办理完业务，急冲冲的离开了");
    }

public class OldMan extends Person{
    public OldMan(){}
    public OldMan(String name){
        this.name = name;
    }
    public void callNum(){
        System.out.println("老年人年纪高了，不熟悉业务，需要帮助");
    }
    public void setBusiness() {
        System.out.println("老人家慢悠悠的在窗口办理业务");
    }
    public void leave() {
        System.out.println("办理完业务后，老人慢悠悠的离开了");
    }

public class Bank {
    //等待客户来办理业务
    public void handleBusiness(Person person){
        //利用多态的特性  传递参数时只需要传递一个父类这一个对象
        //就算再多一个类  只需要这个类也继承父类的方法  银行这边的参数也不需要修改
        System.out.println("欢迎"+person.getName()+"来我们银行办理业务");
        person.callNum();
        person.setBusiness();
        person.leave();
    }
}

public class RunMain {
    public static void main(String[] args){
        Bank bank = new Bank();
        Person p = new OldMan("老人家");
        bank.handleBusiness(p);
        Person p1 = new YongMan("年轻人");
        bank.handleBusiness(p1);
    }
}