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This article will study what threads are and how we can perform a thread program in JAVA. We will look at what threads are, and how they give an advantage over the normal processing technique, the life cycle or stages of a thread, and creating or running a thread program in JAVA using various techniques.<\/p>\n
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Threads can be assumed as subprocesses created to execute processes separately. Threads access shared memory with other threads but do not affect the working of other threads hence, they are independent in working states.<\/p>\n
Advantages of using thread:-<\/strong><\/p>\n Thread can be classified into different stages it can lie in. The states are as follows:- <\/p>\n New State<\/strong> Active State<\/strong> Waiting State<\/strong> Dead \/ Terminated State<\/strong> There are two methods for the creation of threads in java:-<\/p>\n One of the ways to create a thread is by extending the thread class to include the required methods and operations performed on a Thread. The thread supports a runnable interface and has the following constructors in place for creation.<\/p>\n\n
Thread Life Cycle<\/h3>\n
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\nThis state is the default for a thread indicating that the execution is yet to be done.<\/p>\n<\/li>\n
\nAs the start() function is called, the thread gets switched into the active state. There are two sub-states within the active state that can be classified as:- <\/p>\n\n
\nThe thread is in a blocked or waiting state while it is inactive on a temporary basis.
\nFor. If P and Q are two threads with P having the access to resource A and Q waiting to get access to the same resource once P is done. Here, Q is in a blocked or waiting state and remains to be so until the task scheduler reactivates it.
\nIn a condition, where both the threads have an equal slice of interval and both get to be in the blocked or waiting state then the task scheduler clears to process the queue. Thereby, rejecting any unnecessary threads and allocating processors on priority.
\nIn case long waiting time, the risk of starvation is possible, where the threads waiting for the CPU keep on waiting for an undetermined amount of time. To avoid this, timed waiting is put into place every thread has a time period for the sleep() method called, and once the time period is over, the thread starts executing its task.<\/p>\n<\/li>\n
\nThe thread is terminated or dead when it completely performed its task or when it incompetently faces any errors, segmentation faults or exceptions etc.
\nNow that we know about threads and the life cycle of threads, we will be looking forward to how to do thread program in java in the further stages of this article.<\/p>\n<\/li>\n<\/ol>\nCreation of Threads<\/h2>\n
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Create Thread Program in Java (Extend Class)<\/h2>\n\t\t\t\t\t\t