23种设计模式之代理模式（静态代理）

真实对象和代理对象要实现同一个接口代理对象要代理真实角色

优点：

代理对象可以做很多真实对象做不了的事情真实对象专注做自己的事情

例：买票

public class TicketBuyer implements ITicketPurchase{

    @Override
    public void buyTicket() {
        System.out.println("已经买到票了！");
    }

    public static void main(String[] args) {
        BuyTicket buyTicket = new BuyTicket(new TicketBuyer());
        buyTicket.buyTicket();
    }
}

//购票
interface ITicketPurchase{
    void buyTicket();
}

//购票站
class BuyTicket implements ITicketPurchase{

    private TicketBuyer ticketBuyer;

    public BuyTicket(TicketBuyer ticketBuyer) {
        this.ticketBuyer = ticketBuyer;
    }

    //真实的代理对象
    @Override
    public void buyTicket() {
        before();
        this.ticketBuyer.buyTicket();
        after();
    }

    //购票之前
    private void before() {
        System.out.println("查询是否有票...");
        System.out.println("提交购票申请...");
        System.out.println("付钱...");
        System.out.println("出票...");
    }

    //完成购票之后
    private void after() {
        System.out.println("打印发票，提供给购票者！");
    }
}