Difference between revisions of "Threads"
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* Think of Thread as the "worker" and Runnable as the job. | * Think of Thread as the "worker" and Runnable as the job. | ||
* Define work to be done in a class that implements Runnable. | * Define work to be done in a class that implements Runnable. | ||
| − | * Instantiate the thread using the runnable object | + | * Instantiate the thread using the runnable object. (Thread is in the new state) |
| + | * Then start() it. (Thread moves to the runnable state, eligible to run, perhaps waiting for the scheduler to run it) | ||
<syntaxhighlight lang="java5"> | <syntaxhighlight lang="java5"> | ||
| Line 12: | Line 13: | ||
Job j = new Job(); | Job j = new Job(); | ||
Thread t = new Thread(j); | Thread t = new Thread(j); | ||
| − | |||
t.start(); | t.start(); | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| + | |||
| + | * When thread actually runs it is in the running state. | ||
| + | * The thread can also go into waiting/blocked/sleeping state. e.g. waiting for an IO Resource such as a packet to arrive. In other words it is NOT ''runnable''. | ||
| + | * Once run() completes the Thread goes to the dead state. You cannot call start() again on it. Of course, the thread object itself can still be used. | ||
Revision as of 23:21, 8 June 2011
- Think of Thread as the "worker" and Runnable as the job.
- Define work to be done in a class that implements Runnable.
- Instantiate the thread using the runnable object. (Thread is in the new state)
- Then start() it. (Thread moves to the runnable state, eligible to run, perhaps waiting for the scheduler to run it)
class Job implements Runnable {
public void run() {
//work to be performed in a separate thread.
}
}
Job j = new Job();
Thread t = new Thread(j);
t.start();
- When thread actually runs it is in the running state.
- The thread can also go into waiting/blocked/sleeping state. e.g. waiting for an IO Resource such as a packet to arrive. In other words it is NOT runnable.
- Once run() completes the Thread goes to the dead state. You cannot call start() again on it. Of course, the thread object itself can still be used.
