Which of the following will directly stop the execution of a Thread? Explanation: Option A is correct. wait() causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object.

Which event will cause a thread to die?

A thread can die in two ways: either from natural causes, or by being killed (stopped). A thread dies naturally when its run() method exits normally.

Why thread stop is deprecated?

This method was deprecated in API level 15. This method was originally designed to force a thread to stop and throw a ThreadDeath as an exception. It was inherently unsafe. If the target thread waits for long periods (on a condition variable, for example), the interrupt method should be used to interrupt the wait.

Also, how do you stop a thread execution in Java?

In today’s Java version, You can stop a thread by using a boolean volatile variable. If you remember, threads in Java start execution from run() method and stop, when it comes out of run() method, either normally or due to any exception. You can leverage this property to stop the thread.

What are the two methods by which we may stop threads?

There are two ways through which you can stop a thread in java. One is using boolean variable and second one is using interrupt() method.

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Where is the notify () method defined?

Many developers are keen to know why wait, notify and notifyAll methods are defined in object class in java rather than in Thread class. notify() – Wakes up the single thread that is waiting on this object’s monitor. notifyAll() – It wakes up all the threads that called wait() on the same object.

What is synchronization in reference to a thread?

Thread synchronization is the concurrent execution of two or more threads that share critical resources. Threads should be synchronized to avoid critical resource use conflicts. Otherwise, conflicts may arise when parallel-running threads attempt to modify a common variable at the same time.

Which method is used to start a thread execution?

Explanation: run() method is used to define the code that constitutes the new thread, it contains the code to be executed. start() method is used to begin execution of the thread that is execution of run(). run() itself is never used for starting execution of the thread.

How do you kill a thread?

There is no way to gracefully kill a thread. Generally you don’t kill, stop, or interrupt a thread (or check wheter it is interrupted()), but let it terminate naturally. It is simple. You can use any loop together with (volatile) boolean variable inside run() method to control thread’s activity.

How will you make sure that main thread is the last one to exit?

join() waits for the thread to finish before it continues. So the sub-thread will wait for each of the threads that it spawned to finish and then it will finish. The main thread will wait for the sub-thread to finish and will then finish last.

Likewise, people ask, which method directly stop the execution of a thread?

Explanation: Option A is correct. wait() causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object.

Can we overload run method of thread?

Overloading of run() method is possible. But Thread class start() method can invoke no-argument method. The other overloaded method we have to call explicitly like a normal method call. It will be in the same call stack like any other method (if you call from run() method).

Also to know is, does not stop execution of thread?

The output above shows that the inside thread is never stopped. This happens because the change made to ‘exit’ variable in the main thread is not visible to the inside thread. This is so because the inside thread locally caches the value of exit. To prevent this from happening we can use a volatile variable.

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Which method is called internally by thread start () method?

The start() method internally calls the run() method of Runnable interface to execute the code specified in the run() method in a separate thread. The start thread performs the following tasks: It stats a new thread. The thread moves from New State to Runnable state.

What is the difference between suspending and stopping a thread?

Suspending a thread in java puts thread to sleep indefinitely and it can also be resumed, while on the other hand stop threading terminates the thread and it can not be resumed. Once suspended it is also a simple matter to restart the thread.

Does System Exit kill all threads?

Yes, if you System. exit(), then all threads (even native ones) will stop, because System. exit() blows away the process (in the JVMs that I know, anyway). However, your Java program generally should not System.

Which method contains thread body?

–> The run() method contain the body of thread because the run() method to a thread is like the main() method to an application. Starting the thread causes the object’s run method to be called in that separately executing thread.

What should not be done to avoid deadlock?

12 Answers

  1. don’t use multiple threads (like Swing does, for example, by mandating that everything is done in the EDT)
  2. don’t hold several locks at once. If you do, always acquire the locks in the same order.
  3. don’t execute foreign code while holding a lock.
  4. use interruptible locks.

Which state is entered once a thread is created?

runnable state

What is a daemon thread?

Daemon thread is a low priority thread (in context of JVM) that runs in background to perform tasks such as garbage collection (gc) etc., they do not prevent the JVM from exiting (even if the daemon thread itself is running) when all the user threads (non-daemon threads) finish their execution.

Which two can be used to create a new thread?

There are two ways of creating a thread; extend (sub-class) the Thread class and implement the Runnable interface. For both of these ways you must implement (override and not overload) the public void run() method.