java线程的run()没有返回值怎么办？

用线程thread执行一些方法后，需要判断执行是否成功。

public void run() {}

run( ) 方法返回值是空, 怎么办?

解决方法：

• note
• 使用 call() 方法
• callable接口是 jdk 5 后新增的接口
  

代码：

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";
  } 


}

处理返回值

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内容，希望对大家的学习有所帮助。