Introduction to Multithreading in Java
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The document provides an overview of multithreading in Java, covering concepts such as multiprogramming, multitasking, and thread management. It explains the advantages of multithreading, including independent thread execution and memory efficiency, along with the life cycle of threads in Java and relevant built-in methods. Practical applications of multithreading are illustrated through examples like ATM transactions and server requests.
Introduction to Multithreading in Java
- 2. Multithreading in Java You will Learn : Multiprogramming Multitasking Multithreading & Thread Diff between Multiprogramming & Multithreading Practical use of Multithreading Advantages Implementation of Multithreading in Java Built-in Library for Multithreading in Java Important methods to implement Multithreading in Java Program of Multithreading in Eclipse 2rkm
- 3. Multiprogramming Multiprogramming is the ability of an operating system to execute multiple programs at the same time on single processor machine. If the currently executing process performs i/o operation or waiting for i/o then the Operating System may interrupt that process and gives the control to other process residing in main memory. Process 1 Process 2 i/o of P1 3rkm
- 4. The process of having a computer perform multiple tasks simultaneously. For example : Listening of music in background while browsing internet or typing in MS-Word in foreground. Multitasking 4rkm
- 5. Multithreading It is the ability of a CPU which execute multiple thread concurrently, supported by the operating system Thread : A Thread is the smallest sequence of programmed instructions that can be managed independently. Threads are independent because they all have separate path of execution that’s the reason if an exception occurs in one thread, it doesn’t affect the execution of other threads. 5rkm
- 6. Objective of Multithreading: •To increase utilization of a single core by using Thread-level parallelism, as well as Instruction-level parallelism. Difference between Process and Thread : •Process means any program is in execution while thread is a segment of the process. •Every process uses separate memory while all the threads use shared memory. Multithreading 6rkm
- 7. While you are typing on Ms-Word spell check checking spelling and informed to user about the spelling mistake. Spell check working as a Thread. Practical use of Thread 7rkm
- 8. User •When you insert ATM card into ATM Machine it start a new thread to perform your request. There are multiple account holders on the same server requesting the server simultaneously. Server software create a new thread for every user. •Railway reservation system where multiple users accessing the same server. Practical use of Thread Server 8rkm
- 9. •When you request to Amazon server from your mobile through Amazon App, that request become a thread and your Mobile Application doing another task when request is forward in the form of thread. Practical use of Thread 9rkm
- 10. In multimedia games you can use multiple objects like human, gun etc. These objects are nothing but the threads. Practical use of Thread 10rkm
- 11. Advantages of Multithreading •Threads are independent so users are not blocked and we can perform multiple operations at times. •The other threads won't get affected if one thread meets an exception. •Multiple threads don't allocate separate memory area, hence they save memory. •In Multithreading context switching between threads takes less time. 11rkm
- 12. Implementation of Threads in Java Thread Life Cycle in Java 12rkm
- 13. •New: The thread is created using class "Thread class". It remains in this state till the program starts the thread. It is also known as born thread. •Runnable: The instance of the thread is invoked with a start method. The thread control is given to scheduler to finish the execution. It depends on the scheduler, whether to run the thread. •Running: The scheduler selects one thread from the thread pool, and it starts executing in the application. •Waiting: This is the state when a thread has to wait. As there multiple threads are running in the application, there is a need for synchronization between threads. Hence, one thread has to wait, till the other thread gets executed. Therefore, this state is referred as waiting state. •Dead: This is the state when the thread is terminated. The thread is in running state and as soon as it completed processing it is in "dead state". Thread Life Cycle in Java (Stages) 13rkm
- 14. Built-in Library of Java for Thread Built-in Class : Thread Built-in Interface : Runnable Package for both : java.lang (java.lang is default package of Java so it is no need to import explicitly. ) 14rkm
- 15. Important Methods of Java Thread Class void start() : It use to start the execution of thread. It call the run() method defined to do some action in thread. void run() : It used to define an action for thread. static void sleep() : It sleeps a thread for specified time or a thread enter in wait state for a specified time. void stop(): It used to stop a thread. void destroy() : It used to destroy the thread. void suspend() : It used to suspend the thread. void resume() : It resume the suspended thread. static yield(): It pause the currently executing thread and allow other thread to execute temporarily. 15rkm
- 16. Practical Program on Eclipse 16rkm