java怎么写一个计时器，再一段时间内执行某个任务，，到了时间或者任务完成终止

Question

java计时

Answer 1

import java.io.FilterInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
public class CountNet { 
    public static void main(String[] args) {
            int time = 0;
            while (true) {
               if (getCon() == 0) {
                   time++;
               }
                try {    
                Thread.sleep(1000);
                } catch (InterruptedException e) {
                      e.printStackTrace(); 
                } 
                System.out.println("已经连接上了" + time + "秒");
            } 
    } 
    public static int getCon() { 
          URL url = null;  // 构造一个下载的URL路径 
          try {   
              url = new URL("http://www.baidu.com");   // 一个输入流  
              FilterInputStream in;   
              in = (FilterInputStream) url.openStream();   // 关闭流对象   
              in.close();  
          } catch (MalformedURLException e) {   
              return -1;  
          } catch (IOException e) {   
              e.printStackTrace();  
          }  return 0; 
    }
}