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895天前/** |
* Daemon(守护)线程 Daemon线程区别一般线程之处是： |
* 只有虚拟机中的用户线程（非Daimon线程）全部结束，Daemon线程就会立即结束,并且也不会调用finally里的语句。 |
* daemon线程所产生的所有线程都是daemon的 |
*/ |
public class Daemon { |
static class MainThread extends Thread { |
public void run() { |
System.out.println("MainThread is daemon? " + this.isDaemon()); |
System.out.println("MainThread begin!"); |
// 启动子线程 |
Thread sub1 = new SubThread(); |
// sub1线程为守护线程 |
sub1.setDaemon(true); |
sub1.start(); |
try { |
Thread.sleep(1000); |
} catch (InterruptedException e) { |
e.printStackTrace(); |
} finally { |
System.out.println("MainThread" + " finally"); |
} |
System.out.println("MainThread end!"); |
} |
} |
static class SubThread extends Thread { |
public void run() { |
System.out.println("SubThread is daemon? " + this.isDaemon()); |
System.out.println("SubThread begin!"); |
int i = 0; |
try { |
while (i < 10) { |
System.out.println("SubThread " + i++); |
Thread.sleep(200); |
} |
} catch (InterruptedException e) { |
e.printStackTrace(); |
} finally { |
System.out.println("SubThread finally"); |
} |
System.out.println("SubThread end!"); |
} |
} |
public static void main(String[] args) { |
System.out.println("Main begin!"); |
// 默认情况下mainThread是普通线程 |
Thread mainThread = new MainThread(); |
// 启动mainThread线程 |
mainThread.start(); |
try { |
Thread.sleep(500); |
} catch (InterruptedException e1) { |
e1.printStackTrace(); |
} |
System.out.println("Main end!"); |
} |
} |
