这个HttpThread为什么不能.start（）；

Question

package com.example.httpurlconnection;


import android.os.Handler;
import android.webkit.WebView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

/**
* Created by Cal-Lightman on 2017/4/13.
*/

public class HttpThread {

   private String url;
   private WebView webView;
   private Handler handler;

   public HttpThread(String url, WebView webView, Handler handler) {
       this.url = url;
       this.webView = webView;
       this.handler = handler;
   }

   public void run() {
       try {
           URL httpUrl = new URL(url);
           HttpsURLConnection connection = (HttpsURLConnection) httpUrl.openConnection();
           connection.setReadTimeout(5000);
           connection.setRequestMethod("GET");
           final StringBuffer stringBuffer = new StringBuffer();
           BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
           String string;
           while ((string = bufferedReader.readLine()) != null) {
               stringBuffer.append(string);
           }
           handler.post(new Runnable() {
               @Override
               public void run() {
                   webView.loadData(stringBuffer.toString(), "text/html;charset=utf-8", null);
               }
           });
       } catch (MalformedURLException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }
}

package com.example.httpurlconnection;


import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.ImageView;

import static android.provider.ContactsContract.CommonDataKinds.Website.URL;

public class MainActivity extends AppCompatActivity {

   private WebView webView;
   private Handler handler = new Handler();
   private ImageView imageView;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       webView = (WebView) findViewById(R.id.webView);
       imageView = (ImageView) findViewById(R.id.imageView);
       new HttpThread("http://www.baidu.com/", webView, handler).start;
   }

}

Answer 1

这里采取继承Thread类

Answer 2

这是Java基础，要继承Thread类或者实现Runnable接口。

Answer 3

你没继承Thread，哪来的start方法