Скачать или смотреть java thread join method example

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certainly! the `join()` method in java is part of the `thread` class, and it's used to pause the execution of the current thread until the thread on which `join()` is called has completed its execution. this is useful when you want to ensure that a particular thread has finished its task before proceeding with the execution of another thread.

understanding the `join()` method

**syntax**:


**parameters**:
the first method (`join()`) waits indefinitely until the thread dies.
the second method (`join(long millis)`) waits for the specified number of milliseconds for the thread to die.
the third method (`join(long millis, int nanos)`) waits for the specified number of milliseconds and nanoseconds.

**exceptions**: the method throws `interruptedexception` if any thread interrupts the current thread while it's waiting.

example code

here's a simple example demonstrating the use of the `join()` method in java.



explanation of the code

1. **thread class**: `mythread` extends the `thread` class. it has a constructor that takes a string (the name of the thread) and overrides the `run()` method to simulate some work by sleeping for 2 seconds.

2. **starting threads**: in the `main` method, two instances of `mythread` are created and started.

3. **using `join()`**: after starting both threads, the main thread calls `thread1.join()` to wait for `thread1` to finish execution before proceeding. after `thread1` finishes, it prints a message and then calls `thread2.join()` to wait for `thread2` to complete.

4. **completion message**: finally, it prints a message indicating that all threads have completed.

output

when you run this program, you can expect an output similar to:



conclusion

the `join()` method is a powerful tool for thread synchronization in java, allowing you to ensure that one thread completes before another continues its execution. this is particularly useful in scenarios where thread execution order is importan ...

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