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We will see in this tutorial how to perform multiple tasks at the same time and also learn more about threads and synchronization between threads. A single thread in Java is basically a lightweight and the smallest unit of processing.
There are two types of thread — user thread and daemon thread daemon threads are used when we want to clean the application and are used in the background. When an application first begins, user thread is created. Post that, we can create many user threads and daemon threads.
Multithreading in Java is a process of executing two or more threads simultaneously to maximum utilization of CPU. Multithreaded applications execute two or more threads run concurrently. Hence, it is also known as Concurrency in Java. Each thread runs parallel to each other.
Also, context switching between threads takes less time. Some of the commonly used methods for threads are:. Example: In this multithreading program in Java example, we are going to create a thread and explore built-in methods available for threads. In multithreading, there is the asynchronous behavior of the programs.
This is also called a born thread. The thread is in the new state if you create an instance of Thread class but before the invocation of the start method. A thread becomes runnable after a newly born thread is started. In this state, a thread would be executing its task.
The Java Thread class provides methods and constructors to create and perform operations on a thread. The Java thread class extends the Object class and implements the Runnable interface. It starts the execution of the thread and then calls the run on this Thread object. This thread is used to do an action for a thread. The run method is instantiated if the thread was constructed using a separate Runnable object. It causes the current thread to block until the second thread terminates or the specified amount of milliseconds passes.
It is used to check the priority of the thread. When a thread is created, some priority is assigned to it. This priority is assigned either by the JVM or by the programmer explicitly while creating the thread. This method is used to change the priority of the thread. The priority of every thread is represented by the integer number from 1 to The default priority of a thread is 5. This method of thread class is used to return the name of the thread.
We cannot override this method in our program, as this method is final. It returns the identifier of the thread. The thread ID is a number generated when the thread was created. This ID cannot be changed during its lifetime. But when the thread is terminated, the ID can be reused. This method checks if the thread is alive. A thread is in the alive state if the start method of thread class has been called and the thread has not yet died. This method is used to suspend the currently running thread temporarily.
Using the resume method, you can resume the suspended thread. As the name suggests, this method is used to stop the currently running thread. Remember, once the thread execution is stopped, it cannot be restarted.
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