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2010-05-31T17:44:26Z

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== A daemon thread. ==



<source lang="java">
class MyDaemon implements Runnable {
Thread thrd;
MyDaemon() {
thrd = new Thread(this);
thrd.setDaemon(true);
thrd.start();
}
public boolean isDaemon(){
return thrd.isDaemon();
}
public void run() {
try {
while(true) {
System.out.print(".");
Thread.sleep(100);
}
}
catch(Exception exc) {
System.out.println("MyDaemon interrupted.");
}
}
}
public class Main {
public static void main(String args[]) throws Exception{
MyDaemon dt = new MyDaemon();
if(dt.isDaemon())
System.out.println("dt is a daemon thread.");
Thread.sleep(10000);
System.out.println("\nMain thread ending.");
}
}</source>



== A live daemon thread does not prevent an application from exiting. ==



<source lang="java">
class MyThread extends Thread {
MyThread() {
setDaemon(true);
}
public void run() {
boolean isDaemon = isDaemon();
System.out.println("isDaemon:" + isDaemon);
}
}
public class Main {
public static void main(String[] argv) throws Exception {
Thread thread = new MyThread();
thread.setDaemon(true);
thread.start();
}
}</source>



== An application exits when there are no non-daemon threads running. ==



<source lang="java">
class MyThread extends Thread {
MyThread() {
setDaemon(true);
}
public void run() {
boolean isDaemon = isDaemon();
System.out.println("isDaemon:" + isDaemon);
}
}
public class Main {
public static void main(String[] argv) throws Exception {
Thread thread = new MyThread();
thread.setDaemon(true);
thread.start();
}
}</source>



== A thread must be marked as a daemon thread before it is started. ==



<source lang="java">
class MyThread extends Thread {
MyThread() {
setDaemon(true);
}
public void run() {
boolean isDaemon = isDaemon();
System.out.println("isDaemon:" + isDaemon);
}
}
public class Main {
public static void main(String[] argv) throws Exception {
Thread thread = new MyThread();
thread.setDaemon(true);
thread.start();
}
}</source>



== Daemon and User Threads ==

<OL><LI>A daemon thread is a background thread.</LI><LI>It is subordinate to the thread that creates it.</LI><LI>When the thread that created the daemon thread ends, the daemon thread dies with it.</LI></OL>

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в 17:44, 31 мая 2010

Admin: 1 версия