Quick Answer: WHY JOIN is used in Java?

Join method in Java allows one thread to wait until another thread completes its execution. In simpler words, it means it waits for the other thread to die.

Why do we use join in Java?

lang. Thread class provides the join() method which allows one thread to wait until another thread completes its execution. If t is a Thread object whose thread is currently executing, then t. join() will make sure that t is terminated before the next instruction is executed by the program.

WHY JOIN is used in threads?

Joining a thread means that one waits for the other to end, so that you can safely access its result or continue after both have finished their jobs.

What does the join () do?

The join() method creates and returns a new string by concatenating all of the elements in an array (or an array-like object), separated by commas or a specified separator string. If the array has only one item, then that item will be returned without using the separator.

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What is the importance of Alive () and join () methods in Java?

In java, isAlive() and join() are two different methods that are used to check whether a thread has finished its execution or not. The isAlive() method returns true if the thread upon which it is called is still running otherwise it returns false. But, join() method is used more commonly than isAlive().

What is the difference between join and synchronized in Java?

The difference is pretty trivial. Yes, you are right about synchronization : it ensures(if used properly of course) that only one thread access the code. But join doesn’t do this. Instead, join method waits till the thread dies.

What will happen if we dont join threads?

If you don’t join these threads, you might end up using more resources than there are concurrent tasks, making it harder to measure the load. To be clear, if you don’t call join , the thread will complete at some point anyway, it won’t leak or anything. But this some point is non-deterministic.

Is join a blocking call?

Join is a synchronization method that blocks the calling thread (that is, the thread that calls the method) until the thread whose Join method is called has completed. Use this method to ensure that a thread has been terminated. The caller will block indefinitely if the thread does not terminate.

Do I need to join thread?

Not necessarily – depends on your design and OS. Join() is actively hazardous in GUI apps – tend If you don’t need to know, or don’t care, about knowing if one thread has terminated from another thread, you don’t need to join it.

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What is notify () in Java?

The notify() method is defined in the Object class, which is Java’s top-level class. It’s used to wake up only one thread that’s waiting for an object, and that thread then begins execution. The thread class notify() method is used to wake up a single thread. … This method does not return any value.

What does join mean in Java thread?

The join method allows one thread to wait for the completion of another. If t is a Thread object whose thread is currently executing, t. join(); causes the current thread to pause execution until t ‘s thread terminates.

What is string join in Java?

join() method concatenates the given elements with the delimiter and returns the concatenated string. Note that if an element is null, then null is added. The join() method is included in java string since JDK 1.8. There are two types of join() methods in java string.

What is wait () in Java?

Simply put, wait() is an instance method that’s used for thread synchronization. It can be called on any object, as it’s defined right on java. lang. Object, but it can only be called from a synchronized block. It releases the lock on the object so that another thread can jump in and acquire a lock.

What is the joining of data term in Java called?

Java join() method. The join() method in Java is provided by the java. lang. Thread class that permits one thread to wait until the other thread to finish its execution. … join(); statement ensures that th is finished before the program does the execution of the next statement.

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Is Alive () is used for?

This method is used to find out if a thread has actually been started and has yet not terminated.

Is Alive method in thread?

So yes, a thread is “alive” when its run() method is still ongoing, but it is also “alive” in the time window between the invocation of start() and the implicit invocation of the run() method by the JVM.