Java基础 -- 线程

 

JAVA线程 基础一

 

PS:今天突然想看看关于线程的资料，就快速浏览了一下下面这本书，（高级话题没有看）

看了些基本概念，觉得书里小卡片形式的话写的非常不错，就摘录了一些（截图了）。

这本书很不错，又薄又容易懂（而且书中的例子非常有用）。推荐想看线程的朋友看看。

 

 

PS:因为对上面一段话不是很理解，所以写了个小程序验证了一下。

/*  *author: snail  *date: 06-11-09  */ public class IsThreadActive {          public static void main(String[] args)        {               OnlySleepThread t1 = new OnlySleepThread("sleepPig");               OnlySleepThread t2 = new OnlySleepThread("sleepDog");               printThreadsInfo("only main thread in current thread group.two SleepThread haven't slept yet");               t1.start();               t2.start();               try{                      Thread.sleep(3000);                      }catch(InterruptedException e){               }               printThreadsInfo("two SleepThreads are sleeping now ,but they are alive!");               try{                      Thread.sleep(3000);                      }catch(InterruptedException e){               }               printThreadsInfo("two SleepThreads are wakeup and finished!");        }          private static  void printThreadsInfo(String message){               System.out.println("/n"+ message);               Thread[] threads = new Thread[Thread.activeCount()];               int count = Thread.enumerate(threads);         for (int i=0; i<count; i++) {             try {                 //threads[i].join();                             System.out.println(threads[i]+"isAlive?"+threads[i].isAlive());             }             catch (Exception ex) { }         }        }          private static class OnlySleepThread extends Thread        {               private boolean sleeping = true;               public OnlySleepThread(String name){                      super(name);               }                 public void run(){                      while(sleeping)                      {                             try{                                    sleep(5000);                                    sleeping = false;                             }catch(InterruptedException e){                             }                      }               }        }; }