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Difference Between Daemon Threads and User Threads in Java
As we know java is a language that supports multi threading and on the basis of nature threads in java are classified into two types Daemon thread and User thread.
The following are the important differences between Daemon Threads and User Threads.
| Sr. No. | Key | Daemon Threads | User Threads |
|---|---|---|---|
| 1 | Nature | Daemon thread is low in priority i.e JVM does not care much about these types of threads. | User threads are recognized as high priority thread i.e. JVM will wait for any active user thread to get completed. |
| 2 | CPU availability | It is not guaranteed that Daemon thread always gets CPU usage whenever it requires due to its low priority. | User thread always gets preference in getting CPU usage because of its higher priority. |
| 3 | Creation | Daemon threads are executed in the background state so generally named as background threads. | While user thread is usually created by the application for executing some tasks concurrently. |
| 4 | Execution Ground | Daemon threads are executed in the background state so generally named as background threads. | User threads are called foreground threads on another hand. |
| 5 | LifeCycle | Daemon thread has no set lifecycle however they are totally dependent on user threads. | User threads have a specific lifecycle as any other general thread does and its life is independent of any other thread. |
Example of Daemon thread vs User threads
JavaTester.java
class JavaTester extends Thread {
@Override
public void run(){
System.out.println("User Thread or Non-Daemon Thread");
}
}
public class MainThread {
public static void main(String[] args){
JavaTester mt = new JavaTester();
mt.start();
System.out.println("Main Thread");
System.out.println("Is " + mt.getName() + " a Daemon Thread: "+ mt.isDaemon());
System.out.println("Is " + Thread.currentThread().getName() + " a Daemon Thread: " + Thread.currentThread().isDaemon());
}
}
Output
Main Thread Is Thread-0 a Daemon Thread: false Is main a Daemon Thread: false User Thread or Non-Daemon Thread
Updated on: 2019-09-18T12:10:14+05:30
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