What is Threadgroup?
A thread group represents a set of threads. The thread groups form a tree in which every thread group except the initial thread group has a parent. A thread is allowed to access information about its own thread group, but not to access information about its thread group’s parent thread group or any other thread groups.
What is Threadgroup in Java with example?
Every Java thread is a member of a thread group. Thread groups provide a mechanism for collecting multiple threads into a single object and manipulating those threads all at once, rather than individually. For example, you can start or suspend all the threads within a group with a single method call.
What is daemon thread in Java?
Daemon thread in Java is a low-priority thread that runs in the background to perform tasks such as garbage collection. Daemon thread in Java is also a service provider thread that provides services to the user thread. It has no role in life other than to serve user threads.
Which method is used to modify the permission of thread group?
Thread Class Methods
| Method | Description |
|---|---|
| checkAccess() | Determines if the currently running thread has permission to modify this thread. |
| currentThread() | Returns a reference to the currently executing thread object. |
| dumpStack() | Prints a stack trace of the current thread to the standard error stream. |
Is REST API thread safe?
REST APIs are naturally multi-thread, once they can execute multiple requests at the same time. Therefore, every time you put a thread to wait for something synchronously you are wasting CPU time because that thread could be being used to handle another request.
Can you start a thread twice?
No. After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.
What is a ThreadGroup and why is it necessary?
ThreadGroup creates a group of threads. It offers a convenient way to manage groups of threads as a unit. This is particularly valuable in situation in which you want to suspend and resume a number of related threads. The thread group form a tree in which every thread group except the initial thread group has a parent.
What is thread setDaemon?
The setDaemon() method of thread class is used to mark the thread either daemon thread or a user thread. Its life depends on the user threads i.e. when all user threads die, JVM terminates this thread automatically. It must be invoked before the thread is started.
Why do we need daemon thread?
Daemon threads are used for background supporting tasks and are only needed while normal threads are executing. If normal threads are not running and remaining threads are daemon threads then the interpreter exits. When a new thread is created it inherits the daemon status of its parent.
What is the use of ThreadGroup class?
ThreadGroup class in Java. ThreadGroup creates a group of threads. It offers a convenient way to manage groups of threads as a unit. This is particularly valuable in situation in which you want to suspend and resume a number of related threads.
0