/**

  * @author: Tang Jiujia

  * @version: 2017/9/18 0018 15:22

  */

 public interface Data {

     String getResult();

 }

 /**

  * @author: Tang Jiujia

  * @version: 2017/9/18 0018 15:23

  */

 public class RealData implements Data{

     protected final String result;

     public RealData(String para){

         StringBuffer bf=new StringBuffer();

         for (int i=0;i<10;i++){

             bf.append(para);

             try{

                    Thread.sleep(100);

                 }catch (Exception e){

                     e.printStackTrace();

                 }

         }

         result=bf.toString();

     }

     @Override

     public String getResult() {

         return result;

     }

 }

 public class FutureData implements Data{

     protected RealData realData=null;

     protected boolean isReady=false;

     public synchronized void setRealData(RealData realData){

         if(isReady){

            return;

         }

         this.realData=realData;

         isReady=true;

         notifyAll();

     }

     @Override

     public synchronized String getResult() {

         while (!isReady){

             try{

                  wait();

                 }catch (Exception e){

                     e.printStackTrace();

                 }

         }

         return realData.result;

     }

 }

 public class Client {

     public Data request(final String queryStr){

         final FutureData futureData=new FutureData();

         new Thread(){

             @Override

             public void run(){

                 RealData realData=new RealData(queryStr);

                 futureData.setRealData(realData);

             }

         }.start();

         return futureData; //立即返回了futureData

     }

 }

 public class MainClass {

     public static void main(String[] args){

         Client client=new Client();

         Data data=client.request("name");

         System.out.println("请求完毕");

         try{

              Thread.sleep(2000);

             }catch (Exception e){

                 e.printStackTrace();

             }

             System.out.println("数据="+data.getResult());

     }

 }