Multithreading Concept In JAVA

June 05, 2022

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Multithreading is a Java option that enables two or more parts of a program to run at the same time in order to maximize CPU performance. A thread is one of the program's components. As a result, threads are light-weight processes within processes.

Threads can be created using two mechanisms.

1. Thread class extension

2. Runnable Interface implementation

Thread Class vs Runnable Interface :-

1. Multiple inheritances are not supported in Java, so you can't extend the "Thread class" to extend other classes. Other base classes can be extended from the class by implementing the interface "Runnable."

2. The basic functionality of a thread can be expanded by extending the Thread class, which has inherent methods like interrupt() and yield().

3. If you use runnable, you'll get an object that may be shared by multiple threads.

Multitasking :-

Multitasking is the process of performing several tasks at the same time. We use multitasking to utilize the CPU. There are two methods for multitasking:

Process-based Multitasking (Multiprocessing)
Thread-based Multitasking (Multithreading)

(A) Process-based Multitasking (Multiprocessing)

Each process has its own memory address. To put it another way, each process has its own memory space. A procedure is a heavy undertaking. Communication between processes has a significant cost. Switching from one process to another takes time to save and load registers, memory mappings, and update lists, among other things.

(B) Thread-based Multitasking (Multithreading)

The address space for all threads is the same. A thread is a very light material. The cost of communication between threads is minimal.

HOW TO CREATE MULTIPLE THREADS IN JAVA :-

In the Java language package, there is a runnable interface and a class thread that may be accessed. In Java, there are two approaches to create multithreading :-

By Creating a Runnable Interface and overriding a run() method:

It is the process to utilize when a thread needs to be generated, and it is the most recommended method to use.

By creating a thread interface and overriding a start() method:

A thread interface is implemented when your process demands more functionality for a thread.

CYCLE OF THREAD IN VARIOUS PHASES :-

(a) New: A thread's life cycle begins in the new state. It will stay in this condition until you run the start() method on it.

(b) Runnable: When the start() method is called on a new thread, it becomes runnable. In a Java multithreading program, each thread is given a set amount of time. Each thread runs for a short period of time before pausing and providing a new thread to the CPU so that other threads can run. All threads are ready to run, waiting for the CPU, and the currently executing thread is in a runnable state once this is accomplished.

(c) Running : The stage is switched to the "running" stage after the thread execution has begun. The scheduler chooses one thread from the group of threads to begin the application's execution.

(d) Waiting : A thread is said to be waiting if it is waiting for another thread to complete a task. The thread is still alive at this point. For example, a thread gets blocked as it waits for I/O to complete. The Thread Scheduler is in charge of reactivating and scheduling a blocked or waiting thread. A thread in this state can't move forward unless it's moved to a working state. In these conditions, no CPU cycle is utilized by any thread.

(e) Terminated/Dead: The "dead" stage refers to the point at which the thread is terminated. When a thread is switched from running to finished processing, it is terminated and is considered "dead."

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BENEFITS OF MULTITHREADING IN JAVA :-

In Java, a multithreading program allows many components of a program to run at the same time. Threads are lightweight processes that are readily available throughout the procedure. As a result, a Java multithreading program maximizes CPU utilization through multitasking. The following are some of the benefits of multithreading in Java :-

Multithreading applications in Java make it easier to conduct numerous computing activities at the same time.

Multithreading applications improve the program's responsiveness. When many threads are active, separate threads are executed, causing the program to freeze. It maintains the application going by running other pending tasks at the same time.

Multithreading program improve the speed with which a server responds. It ensures that huge and complex requests are not frozen, and that generating numerous threads in Java does not prevent other requests from being processed. It improves the server's total output.

Multithreading in Java reduces system usage by making threads easier to maintain, manage, and create with less overhead.

In Java, multithreading enhances the program structure by making it simpler and more accessible. These reduced threads can be utilized in high-server-class media applications to easily adjust or improve the structure of these intricate structures.

In Java, multithreading allows for synchronization. It allows for faster data sharing. All of this is made feasible by sharing space with someone who has a similar data address.

CONCLUSION :-

Multithreading in Java is an important feature that every Java developer should be familiar with. It aids in the efficiency of the program and decreases the use of storage resources. It allows the CPUs to be used to their full potential, regardless of their complexity. If you want to learn more about threads, you'll need to know about the Thread class and the Runnable interface, as both provide a path and make threads popular among programmers

REFERENCES :-

https://www.jigsawacademy.com/blogs/java/multithreading-in-java

https://www.geeksforgeeks.org/multithreading-in-java

https://www.javatpoint.com/multithreading-in-jav

https://blog.knoldus.com/multithreading-in-java/

https://medium.com/swlh/java-multithreading-b8dd4771a902