Program for inter thread communication in java

At the end of this article, you will understand how multiple threads communicate with each other in java with examples. It is a mechanism of communication between two threads or multiple threads that acts on the common object owner. To perform the multiple actions at a time we need Inter-thread communication. For example online video player, audio player, etc. In both types of players generally, there are two types of threads: Buffer Thread and Playing Thread.

Buffer Thread is responsible to download content from the server into a buffer memory and whereas playing thread is responsible to play content and these actions will be done based on thread communication only. Java Abstract Class. Abstract Method In Java. Interfaces, Packages and Access Control.

Java Interface. Java Package. How To Compile Classes in Package. Access Modifiers In Java. Static Keyword In Java. Singleton Design Pattern In Java. Object Oriented Concepts - Revisited. Abstraction in Java. Polymorphism In Java. Encapsulation In Java. Inheritance In Java.

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Collections Framework. Java Collections Overview. Collection Interface. Java List Interface. Set Interface In Java. Java SortedSet Interface. This time, each of the three threads A, B, and C need to prepare separately, and then they start to run simultaneously after all of them three are ready. How should we achieve that? The CountDownLatch above can be used to count down, but when the count is completed, only one of the threads' await method will get a response, so multiple threads cannot be triggered at the same time.

In order to achieve the effect of threads' waiting for each other, we can use the CyclicBarrier data structure, and its basic usage is:. The implementation code is as follows. Imagine that there are three runners who need to start to run simultaneously, so they need to wait for others until all of them are ready. In actual development, often we need to create child threads to do some time-consuming tasks, and then pass the execution results back to the main thread.

So how to implement this in Java? So generally, when creating the thread, we'll pass the Runnable object to Thread for execution. The definition for Runnable is as follows:. You can see that run method does not return any results after execution.

Then what if you want to return the results? Here you can use another similar interface class Callable :. It can be seen that the biggest difference for Callable is that it returns the generics.

Cooperation Inter-thread communication is a mechanism in which a thread is paused running in its critical section and another thread is allowed to enter or lock in the same critical section to be executed. It is implemented by following methods of Object class :. The wait method causes current thread to release the lock and wait until either another thread invokes the notify method or the notifyAll method for this object, or a specified amount of time has elapsed.

The current thread must own this object's monitor, so it must be called from the synchronized method only otherwise it will throw exception. The notify method wakes up a single thread that is waiting on this object's monitor.

If any threads are waiting on this object, one of them is chosen to be awakened. The choice is arbitrary and occurs at the discretion of the implementation. JavaTpoint offers too many high quality services.

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