java線程的run()沒有返回值怎麼辦？

作者：Eve Cole 更新時間：2025-08-25 07:00:03

用線程Thread執行一些方法後，需要判斷執行是否成功。

public void run() {}

run( ) 方法返回值是空, 怎麼辦?

解決方法：

Note
使用call() 方法
Callable接口是jdk 5 後新增的接口

代碼：

 package com.example.thread;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.concurrent.Callable;import android.util.Log;import com.example.StreamTool.StreamTool;public class MyThread1 implements Callable<String> { private static final String tag = "xxxyyy"; private String phone; private String name; public MyThread1(String name, String phone) { this.name = name; this.phone = phone; } // public MyThread1(String name, String phone) {// super(name);// this.phone = phone;// } // public void run() {// Log.i(tag, Thread.currentThread().getName() + "......start");// String newpath = "http://www.dianping.com/ajax/json/account/reg/mobile/send?m=" + phone + "&flow=t&callback=DP._JSONPRequest._5";// StringBuilder strBui = new StringBuilder(newpath);//// try {// URL url = new URL(strBui.toString());// HttpURLConnection con = (HttpURLConnection) url.openConnection();// con.addRequestProperty("Content-Type", "text/html; charset=UTF-8");// con.addRequestProperty(// "User-Agent",// "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36");// con.addRequestProperty("Cookie", "_hc.v=/"///"0ffcdf91-a4d6-4b08-8800-3d59d2e2fe45.1413899372///"/"; abtest=/"48,124//|52,133//|47,122//|44,106//|45,115/"; __utma=1.29319792.1412090870.1413609669.1413645970.5; __utmz=1.1413645970.5.2.utmcsr=t.dianping.com|utmccn=(referral)|utmcmd=referral|utmcct=/xian; _tr.u=7dhY0yFhd9rY065F; tc=17; cy=17; cye=xian; t_rct=2172824|2171729|6457678; PHOENIX_ID=0a01743f-1492e1321c8-46e6a; 13.t=17deda7d2a7d8e46d84bf12a74627b72; 13.ts=cd3bd6495620e2a204912c4bdfd43220; thirdtoken=891671FC6B450418DD6E0611A3E4CF48; _hc.v=/"///"1bdad871-405e-46e3-97d6-46571ad48e14.1413897928///"/"; _tr.s=Zy1Ca2OAe1ptv06o; JSESSIONID=891671FC6B450418DD6E0611A3E4CF48");// con.addRequestProperty("Referer", "http://t.dianping.com/register");// con.setConnectTimeout(5000);// con.setRequestMethod("GET");// // if (con.getResponseCode() == 200){// InputStream inputStr = con.getInputStream();// String info = new String(StreamTool.read(inputStr), "UTF-8");// Log.i(tag, Thread.currentThread().getName() + info);// }// } catch (MalformedURLException e) {// // TODO Auto-generated catch block// e.printStackTrace();// } catch (IOException e) {// // TODO Auto-generated catch block// e.printStackTrace();// } catch (Exception e) {// // TODO Auto-generated catch block// e.printStackTrace();// }// // // } @Override public String call() throws Exception { Log.i(tag, Thread.currentThread().getName() + "......start"); String newpath = "http://www.dianping.com/ajax/json/account/reg/mobile/send?m=" + phone + "&flow=t&callback=DP._JSONPRequest._5"; StringBuilder strBui = new StringBuilder(newpath); try { URL url = new URL(strBui.toString()); HttpURLConnection con = (HttpURLConnection) url.openConnection(); con.addRequestProperty("Content-Type", "text/html; charset=UTF-8"); con.addRequestProperty( "User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36"); con.addRequestProperty("Cookie", "_hc.v=/"///"0ffcdf91-a4d6-4b08-8800-3d59d2e2fe45.1413899372///"/"; abtest=/"48,124//|52,133//|47,122//|44,106//|45,115/"; __utma=1.29319792.1412090870.1413609669.1413645970.5; __utmz=1.1413645970.5.2.utmcsr=t.dianping.com|utmccn=(referral)|utmcmd=referral|utmcct=/xian; _tr.u=7dhY0yFhd9rY065F; tc=17; cy=17; cye=xian; t_rct=2172824|2171729|6457678; PHOENIX_ID=0a01743f-1492e1321c8-46e6a; 13.t=17deda7d2a7d8e46d84bf12a74627b72; 13.ts=cd3bd6495620e2a204912c4bdfd43220; thirdtoken=891671FC6B450418DD6E0611A3E4CF48; _hc.v=/"///"1bdad871-405e-46e3-97d6-46571ad48e14.1413897928///"/"; _tr.s=Zy1Ca2OAe1ptv06o; JSESSIONID=891671FC6B450418DD6E0611A3E4CF48"); con.addRequestProperty("Referer", "http://t.dianping.com/register"); con.setConnectTimeout(5000); con.setRequestMethod("GET"); float x = 3.4f; if (con.getResponseCode() == 200){ InputStream inputStr = con.getInputStream(); String info = new String(StreamTool.read(inputStr), "UTF-8"); Log.i(tag, Thread.currentThread().getName() + info); if(info.contains("200")) return "200"; } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } // TODO Auto-generated method stub return "404"; } }

處理返回值

ExecutorService exec = Executors.newCachedThreadPool(); ArrayList<Future<String>> results = new ArrayList<Future<String>>(); for(int i = 0; i < num; i++) results.add(exec.submit(selectThread(telnumber))); for (Future<String> fs:results) try { if (fs.get().equals("200")) success++; } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ExecutionException e) { // TODO Auto-generated catch block e.printStackTrace(); } return success;

以上就是本文的全部內容，希望對大家的學習有所幫助。