public interface OrderResult {
 /**
 * 訂購貨物的狀態(tài)
 *
 * @param state
 * @return
 */
 //參數(shù)可以不用, 用不用按照自己的實(shí)際需求決定
 public String getOrderResult(String state);
}

public class Store {
 @Getter
 @Setter
 private String name;

 Store(String name) {
 this.name = name;
 }

 /*回調(diào)函數(shù), 將結(jié)構(gòu)傳給那個(gè)我們不能直接調(diào)用的方法, 然后獲取結(jié)果*/
 public String returnOrderGoodsInfo(OrderResult order) {
 String[] s = {"訂購中...", "訂購失敗", "即將發(fā)貨!", "運(yùn)輸途中...", "已在投遞"};
 Random random = new Random();
 int temp = random.nextInt(5);
 String s1 = s[temp];
 return order.getOrderResult(s1);
 }
}

/*同步, 顧客在商店預(yù)訂商品, 商店通知顧客預(yù)訂情況*/
public class SyncBuyer implements OrderResult {
 @Getter
 @Setter
 private Store store;//商店
 @Getter
 @Setter
 private String buyerName;//購物者名
 @Getter
 @Setter
 private String goodsName;//所購商品名

 SyncBuyer(Store store, String buyerName, String goodsName) {
 this.store = store;
 this.buyerName = buyerName;
 this.goodsName = goodsName;
 }

 /*調(diào)用從商店返回訂購物品的信息*/
 public String orderGoods() {
 String goodsState = store.returnOrderGoodsInfo(this);
 System.out.println(goodsState);
 myFeeling();// 測(cè)試同步還是異步, 同步需要等待, 異步無需等待
 return goodsState;

 }

 public void myFeeling() {
 String[] s = {"有點(diǎn)小激動(dòng)", "很期待!", "希望是個(gè)好貨!"};
 Random random = new Random();
 int temp = random.nextInt(3);
 System.out.println("我是" + this.getBuyerName() + ", 我現(xiàn)在的感覺: " + s[temp]);
 }

 /*被回調(diào)的方法, 我們自己不去調(diào)用, 這個(gè)方法給出的結(jié)果, 是其他接口或者程序給我們的, 我們自己無法產(chǎn)生*/
 @Override
 public String getOrderResult(String state) {
 return "在" + this.getStore().getName() + "商店訂購的" + this.getGoodsName() + "玩具, 目前的預(yù)訂狀態(tài)是: " + state;
 }
}

public class Test2Callback {
 public static void main(String[] args) {
 Store wallMart = new Store("沙中路沃爾瑪");
 SyncBuyer syncBuyer = new SyncBuyer(wallMart, "小明", "超能鐵扇公主");
 System.out.println(syncBuyer.orderGoods());
 }
}

public interface OrderResult {
 /**
 * 訂購貨物的狀態(tài)
 *
 * @param state
 * @return
 */
 //參數(shù)可以不用, 用不用按照自己的實(shí)際需求決定
 public String getOrderResult(String state);
}

public class Store {
 @Getter
 @Setter
 private String name;

 Store(String name) {
 this.name = name;
 }

 /*回調(diào)函數(shù), 將結(jié)構(gòu)傳給那個(gè)我們不能直接調(diào)用的方法, 然后獲取結(jié)果*/
 public String returnOrderGoodsInfo(OrderResult order) {
 String[] s = {"訂購中...", "訂購失敗", "即將發(fā)貨!", "運(yùn)輸途中...", "已在投遞"};
 Random random = new Random();
 int temp = random.nextInt(5);
 String s1 = s[temp];
 return order.getOrderResult(s1);
 }
}

/*異步*/
@Slf4j
public class NoSyncBuyer implements OrderResult {
 @Getter
 @Setter
 private Store store;//商店
 @Getter
 @Setter
 private String buyerName;//購物者名
 @Getter
 @Setter
 private String goodsName;//所購商品名

 NoSyncBuyer(Store store, String buyerName, String goodsName) {
 this.store = store;
 this.buyerName = buyerName;
 this.goodsName = goodsName;
 }

 /*調(diào)用從商店返回訂購物品的信息*/
 public String orderGoods() {
 String goodsState = "--";
 MyRunnable mr = new MyRunnable();
 Thread t = new Thread(mr);
 t.start();
 System.out.println(goodsState);
 goodsState = mr.getResult();// 得到返回值
 myFeeling();// 用來測(cè)試異步是不是還是按順序的執(zhí)行
 return goodsState;
 }

 public void myFeeling() {
 String[] s = {"有點(diǎn)小激動(dòng)", "很期待!", "希望是個(gè)好貨!"};
 Random random = new Random();
 int temp = random.nextInt(3);
 System.out.println("我是" + this.getBuyerName() + ", 我現(xiàn)在的感覺: " + s[temp]);
 }

 /*被回調(diào)的方法, 我們自己不去調(diào)用, 這個(gè)方法給出的結(jié)果, 是其他接口或者程序給我們的, 我們自己無法產(chǎn)生*/
 @Override
 public String getOrderResult(String state) {
 return "在" + this.getStore().getName() + "商店訂購的" + this.getGoodsName() + "玩具, 目前的預(yù)訂狀態(tài)是: " + state;
 }

 // 開啟另一個(gè)線程, 但是沒有返回值, 怎么回事
 // 調(diào)試的時(shí)候, 等待一會(huì)兒, 還是可以取到值, 但不是立即取到, 在print顯示的時(shí)候, 卻是null, 需要注意?
 private class MyRunnable implements Runnable {
 @Getter
 @Setter
 private String result;

 @Override
 public void run() {
  try {
  Thread.sleep(10000);
  result = store.returnOrderGoodsInfo(NoSyncBuyer.this);// 匿名函數(shù)的時(shí)候, 無法return 返回值
  } catch (InterruptedException e) {
  log.error("出大事了, 異步回調(diào)有問題了", e);
  }
 }
 }
}

public class Test2Callback {
 public static void main(String[] args) {
 Store wallMart = new Store("沙中路沃爾瑪");
 SyncBuyer syncBuyer = new SyncBuyer(wallMart, "小明", "超能鐵扇公主");
 System.out.println(syncBuyer.orderGoods());


 System.out.println("\n");
 Store lawson = new Store("沙中路羅森便利店");
 NoSyncBuyer noSyncBuyer = new NoSyncBuyer(lawson, "cherry", "變形金剛");
 System.out.println(noSyncBuyer.orderGoods());
 }
}