> ("Hello from daemon!")) Ĭuriously, if you run this as a part of the main() method, the message might not get printed. To start a thread as a daemon, you should use the setDaemon() method before calling start(): Thread daemon = new Thread(() Daemon threads are usually used to carry out some supportive or service tasks for other threads, but you should take into account that they may be abandoned at any time. When all non-daemon threads are terminated, the JVM simply abandons all remaining daemon threads. What Is the Difference Between the Runnable and Callable Interfaces? How Are They Used?Ī daemon thread is a thread that does not prevent JVM from exiting. TERMINATED - a thread has completed the execution of its n() method and terminated.TIMED_WAITING - same as the above, but a thread enters this state after calling timed versions of Thread.sleep(), Object.wait(), Thread.join() and some other methods.For instance, a thread enters this state upon calling the Object.wait() method on a monitor it holds, or the Thread.join() method on another thread WAITING - a thread enters this state if it waits for another thread to perform a particular action.BLOCKED - a running thread becomes blocked if it needs to enter a synchronized section but cannot do that due to another thread holding the monitor of this section. A NEW thread enters the RUNNABLE state when you call Thread.start() on it It is called runnable because at any given time it could be either running or waiting for the next quantum of time from the thread scheduler. NEW - a new Thread instance that was not yet started via Thread.start().Different states of a Thread are described in the Thread.State enum. The state of a Thread can be checked using the Thread.getState() method.
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