Multithreading in Java.pdf
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About This Presentation
Multithreading in Java - Everything You MUST Know
Slide Content
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 1/19
// Tutorial //
Multithreading in Java - Everything You MUST Know
Published on August 3, 2022CONTENTS
What is Multithreading?
Multithreading vs Multiprocessing
How does Java Support Multithreading?
What are the different types of threads?
What is Thread Priority?
How Do we Create Thread in Java?
Conclusion
BlogDocsGet SupportContact Sales
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// Tutorial //
Multithreading in Java - Everything You MUST Know
Published on August 3, 2022CONTENTS
What is Multithreading?
Multithreading vs Multiprocessing
How does Java Support Multithreading?
What are the different types of threads?
What is Thread Priority?
How Do we Create Thread in Java?
Conclusion
BlogDocsGet SupportContact Sales
TutorialsQuestionsLearning PathsFor BusinessesProduct DocsSocial Impact
Join the many businesses saving up to 50% or more with DigitalOcean->
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 2/19
Java
ByPankaj
While we believe that this content benefits our community, we have not yet thoroughly reviewed it.If you have
any suggestions for improvements, please let us know by clicking the“report an issue“ button at the bottom of
the tutorial.
https://www.digitalocean.com/community/tutorials/multithreading-in-java 2/19
Java
ByPankaj
While we believe that this content benefits our community, we have not yet thoroughly reviewed it.If you have
any suggestions for improvements, please let us know by clicking the“report an issue“ button at the bottom of
the tutorial.
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 3/19
When we run a real-world application, we use good processors for faster execution. But, only processor
speed can’t make your application run fast. One of the great ways to create a performance efficient
application is use utilize multithreading.
What is Multithreading?
Multithreading is a programming concept in which the application can create a small unit of tasks to
execute in parallel. If you are working on a computer, it runs multiple applications and allocates
processing power to them. A simple program runs in sequence and the code statements execute one by
one. This is a single-threaded application. But, if the programming language supports creating multiple
threads and passes them to the operating system to run in parallel, it’s called multithreading.
Multithreading vs Multiprocessing
When we talk about multithreading, we don’t care if the machine has a 2-core processor or a 16-core
processor. Our work is to create a multithreaded application and let the OS handle the allocation and
execution part. In short, multithreading has nothing to do with multiprocessing.
How does Java Support Multithreading?
Java has great support for multithreaded applications. Java supports multithreading through Thread
class. Java Thread allows us to create a lightweight process that executes some tasks. We can create
multiple threads in our program and start them. Java runtime will take care of creating machine-level
instructions and work with OS to execute them in parallel.
What are the different types of threads?
https://www.digitalocean.com/community/tutorials/multithreading-in-java 3/19
When we run a real-world application, we use good processors for faster execution. But, only processor
speed can’t make your application run fast. One of the great ways to create a performance efficient
application is use utilize multithreading.
What is Multithreading?
Multithreading is a programming concept in which the application can create a small unit of tasks to
execute in parallel. If you are working on a computer, it runs multiple applications and allocates
processing power to them. A simple program runs in sequence and the code statements execute one by
one. This is a single-threaded application. But, if the programming language supports creating multiple
threads and passes them to the operating system to run in parallel, it’s called multithreading.
Multithreading vs Multiprocessing
When we talk about multithreading, we don’t care if the machine has a 2-core processor or a 16-core
processor. Our work is to create a multithreaded application and let the OS handle the allocation and
execution part. In short, multithreading has nothing to do with multiprocessing.
How does Java Support Multithreading?
Java has great support for multithreaded applications. Java supports multithreading through Thread
class. Java Thread allows us to create a lightweight process that executes some tasks. We can create
multiple threads in our program and start them. Java runtime will take care of creating machine-level
instructions and work with OS to execute them in parallel.
What are the different types of threads?
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 4/19
There are two types of threads in an application - user thread and daemon thread. When we start an
application, the main is the first user thread created. We can create multiple user threads as well as
daemon threads. When all the user threads are executed, JVM terminates the program.
What is Thread Priority?
When we create a thread, we can assign its priority. We can set different priorities to different Threads
but it doesn’t guarantee that a higher priority thread will execute first than a lower priority thread. The
thread scheduler is the part of Operating System implementation and when a Thread is started, its
execution is controlled by Thread Scheduler and JVM doesn’t have any control over its execution.
How Do we Create Thread in Java?
We can create Threads by either implementing Runnable interface or by extending Thread Class.
Above is a one-line statement to create a new Thread. Here we are creating a Runnable as an anonymous
class. If you are familiar with lambda expressions, we can create a Thread with much shorter code.
Thread t = new Thread(new Runnable(){
@Override
public void run() {
}
});
Copy
Runnable runnable = () -> System.out.println("Hello");
Copy
https://www.digitalocean.com/community/tutorials/multithreading-in-java 4/19
There are two types of threads in an application - user thread and daemon thread. When we start an
application, the main is the first user thread created. We can create multiple user threads as well as
daemon threads. When all the user threads are executed, JVM terminates the program.
What is Thread Priority?
When we create a thread, we can assign its priority. We can set different priorities to different Threads
but it doesn’t guarantee that a higher priority thread will execute first than a lower priority thread. The
thread scheduler is the part of Operating System implementation and when a Thread is started, its
execution is controlled by Thread Scheduler and JVM doesn’t have any control over its execution.
How Do we Create Thread in Java?
We can create Threads by either implementing Runnable interface or by extending Thread Class.
Above is a one-line statement to create a new Thread. Here we are creating a Runnable as an anonymous
class. If you are familiar with lambda expressions, we can create a Thread with much shorter code.
Thread t = new Thread(new Runnable(){
@Override
public void run() {
}
});
Copy
Runnable runnable = () -> System.out.println("Hello");
Copy
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 5/19
Once we have created a Thread, we have to start its execution by calling the start() method.
I have written a lot of posts explaining the concepts of multithreading in Java. You can go through these
in sequence to learn everything about multithreading, its real-life usage, thread lifecycle, thread pool, etc.
1. Java Thread and Runnable
This is the first post about the Thread class and Runnable interface. You will also learn about Process and
Thread. What is the difference between Thread and Process? Benefits of using Threads and how we can
create Threads using Runnable interface and Thread class. This post also compares the Runnable
interface with the Thread class.
2. Java Thread Sleep
Java Thread sleep is used to pause the execution of the current thread. We will use Thread sleep
extensively in future posts, so it’s good to know how it works and is it accurate or not?
3. Java Thread Join
Sometimes we need to wait for other threads to finish their execution before we can proceed. We can
achieve this using the Thread join method, learn how it works and when we should use it.
4. Java Thread States
Understanding different states of thread are important. Learn how a thread changes its state and how
the operating system thread scheduler changes the state of a thread.
5. Java Thread wait, notify and notifyAll
runnable.start();
Copy
https://www.digitalocean.com/community/tutorials/multithreading-in-java 5/19
Once we have created a Thread, we have to start its execution by calling the start() method.
I have written a lot of posts explaining the concepts of multithreading in Java. You can go through these
in sequence to learn everything about multithreading, its real-life usage, thread lifecycle, thread pool, etc.
1. Java Thread and Runnable
This is the first post about the Thread class and Runnable interface. You will also learn about Process and
Thread. What is the difference between Thread and Process? Benefits of using Threads and how we can
create Threads using Runnable interface and Thread class. This post also compares the Runnable
interface with the Thread class.
2. Java Thread Sleep
Java Thread sleep is used to pause the execution of the current thread. We will use Thread sleep
extensively in future posts, so it’s good to know how it works and is it accurate or not?
3. Java Thread Join
Sometimes we need to wait for other threads to finish their execution before we can proceed. We can
achieve this using the Thread join method, learn how it works and when we should use it.
4. Java Thread States
Understanding different states of thread are important. Learn how a thread changes its state and how
the operating system thread scheduler changes the state of a thread.
5. Java Thread wait, notify and notifyAll
runnable.start();
Copy
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 6/19
Java Object class contains three methods to communicate the lock status of a resource. Learn with
example usage of these Object class methods in a simple Wait-Notify implementation.
6. Thread Safety and Synchronization
We know that Threads share Object resources, which can lead to data corruption because these
operations are not atomic. Learn how we can achieve thread-safety in java using different methods. Read
this post to learn about the correct usage of synchronization, synchronized methods, and synchronized
blocks.
7. Java Exception in thread main
JVM creates the first thread using the main method. This post explains some common exceptions we see
in daily life and what is the root cause of them and how to fix them.
8. Thread Safety in Singleton Class
In this article, you will learn basic concepts of creating a Singleton class. What are thread safety issues
with different implementations? How we can achieve thread-safety in Singleton class.
9. Daemon Thread in Java
A simple article explaining daemon threads and how we can create daemon threads in java.
10. Java Thread Local
We know that threads share Object’s variables but what if we want to have thread-local variables created
at the class level. Java provides the ThreadLocal utility class to create thread-local variables. Read more
to learn about how we can create ThreadLocal variables in the java program.
11. Java Thread Dump
https://www.digitalocean.com/community/tutorials/multithreading-in-java 6/19
Java Object class contains three methods to communicate the lock status of a resource. Learn with
example usage of these Object class methods in a simple Wait-Notify implementation.
6. Thread Safety and Synchronization
We know that Threads share Object resources, which can lead to data corruption because these
operations are not atomic. Learn how we can achieve thread-safety in java using different methods. Read
this post to learn about the correct usage of synchronization, synchronized methods, and synchronized
blocks.
7. Java Exception in thread main
JVM creates the first thread using the main method. This post explains some common exceptions we see
in daily life and what is the root cause of them and how to fix them.
8. Thread Safety in Singleton Class
In this article, you will learn basic concepts of creating a Singleton class. What are thread safety issues
with different implementations? How we can achieve thread-safety in Singleton class.
9. Daemon Thread in Java
A simple article explaining daemon threads and how we can create daemon threads in java.
10. Java Thread Local
We know that threads share Object’s variables but what if we want to have thread-local variables created
at the class level. Java provides the ThreadLocal utility class to create thread-local variables. Read more
to learn about how we can create ThreadLocal variables in the java program.
11. Java Thread Dump
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 7/19
Java Thread dump provides the information of the current thread. A thread dump is useful to analyze
performance issues with the application. You can use thread dump to find and fix deadlock situations.
This post explains different methods that can be used to generate thread dumps in java.
12. How to Analyze Deadlock in Java
Deadlock is a situation where multiple threads are waiting for each other to release resources causing
cyclic dependency. This article discusses the situation in which we can get deadlock in a java program.
How we can use Thread dump to find the deadlock and best practices to avoid deadlock in java program.
13. Java Timer Thread
This post explains how we can use Java Timer and TimerTask classes to create jobs to run at a
scheduled interval, an example program showing its usage, and how we can cancel the timer.
14. Java Producer Consumer Problem
Before Java 5, the producer-consumer problem can be solved using wait() and notify() methods but the
introduction of BlockingQueue has made it very easy. Learn how we can use BlockingQueue to solve the
producer-consumer problem in java.
15. Java Thread Pool
Java Thread Pool is a collection of worker threads waiting to process jobs. Java 5 introduction of the
Executor framework has made it very easy to create a thread pool in java. We can use Executors and
ThreadPoolExecutor classes to create and manage a thread pool.
16. Java Callable Future
Sometimes we want our Thread to return some values that we can use. Java 5 Callable can be used in
that case, which is similar to the Runnable interface. We can use the Executor framework to execute
https://www.digitalocean.com/community/tutorials/multithreading-in-java 7/19
Java Thread dump provides the information of the current thread. A thread dump is useful to analyze
performance issues with the application. You can use thread dump to find and fix deadlock situations.
This post explains different methods that can be used to generate thread dumps in java.
12. How to Analyze Deadlock in Java
Deadlock is a situation where multiple threads are waiting for each other to release resources causing
cyclic dependency. This article discusses the situation in which we can get deadlock in a java program.
How we can use Thread dump to find the deadlock and best practices to avoid deadlock in java program.
13. Java Timer Thread
This post explains how we can use Java Timer and TimerTask classes to create jobs to run at a
scheduled interval, an example program showing its usage, and how we can cancel the timer.
14. Java Producer Consumer Problem
Before Java 5, the producer-consumer problem can be solved using wait() and notify() methods but the
introduction of BlockingQueue has made it very easy. Learn how we can use BlockingQueue to solve the
producer-consumer problem in java.
15. Java Thread Pool
Java Thread Pool is a collection of worker threads waiting to process jobs. Java 5 introduction of the
Executor framework has made it very easy to create a thread pool in java. We can use Executors and
ThreadPoolExecutor classes to create and manage a thread pool.
16. Java Callable Future
Sometimes we want our Thread to return some values that we can use. Java 5 Callable can be used in
that case, which is similar to the Runnable interface. We can use the Executor framework to execute
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 8/19
Callable tasks.
17. Java FutureTask Example
FutureTask class is the base concrete class that implements the Future interface. We use it with Callable
implementation and Executors for asynchronous processing. The FutureTask class provides
implementation methods to check the state of the task and return the value to the calling program once
its processing is finished. It comes in handy when you want to override some of the implementation
methods of the Future interface.
Conclusion
Multithreading is a very broad topic and writing everything about it in a single post wouldn’t have been
possible. If you go through the above posts in sequence, you will learn everything about multithreading in
Java.
Thanks for learning with the DigitalOcean Community. Check out our offerings for compute,
storage, networking, and managed databases.
Learn more about us->
https://www.digitalocean.com/community/tutorials/multithreading-in-java 8/19
Callable tasks.
17. Java FutureTask Example
FutureTask class is the base concrete class that implements the Future interface. We use it with Callable
implementation and Executors for asynchronous processing. The FutureTask class provides
implementation methods to check the state of the task and return the value to the calling program once
its processing is finished. It comes in handy when you want to override some of the implementation
methods of the Future interface.
Conclusion
Multithreading is a very broad topic and writing everything about it in a single post wouldn’t have been
possible. If you go through the above posts in sequence, you will learn everything about multithreading in
Java.
Thanks for learning with the DigitalOcean Community. Check out our offerings for compute,
storage, networking, and managed databases.
Learn more about us->
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 9/19
Still looking for an answer? Ask a question Search for more help
Was this helpful? Yes No
About the authors
PankajAuthor
Comments
JournalDev •August 29, 2020
Hi Pankaj Is your multithreading Tutorials updated for the recent Java version ? Which version of
jdk it supports ? Do reply.
https://www.digitalocean.com/community/tutorials/multithreading-in-java 9/19
Still looking for an answer? Ask a question Search for more help
Was this helpful? Yes No
About the authors
PankajAuthor
Comments
JournalDev •August 29, 2020
Hi Pankaj Is your multithreading Tutorials updated for the recent Java version ? Which version of
jdk it supports ? Do reply.
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 10/19
/ Deepak
JournalDev •February 6, 2019
Thanks for all examples
/ Lacarte
JournalDev •October 15, 2018
Can u help me with the code for database query optimisation using threads??
/ Vaibhav Gupta
JournalDev •July 27, 2018
Is this sentence is correct from your tutorial, We can set different priorities to different Threads
but it doesn’t guarantee that higher priority thread will execute first than lower priority thread? I
think, Priority threads are executed first. If I am wrong, could you please explain in which case
higher priority thread is not executed before lesser priority.
/ Shyam Patil
https://www.digitalocean.com/community/tutorials/multithreading-in-java 10/19
/ Deepak
JournalDev •February 6, 2019
Thanks for all examples
/ Lacarte
JournalDev •October 15, 2018
Can u help me with the code for database query optimisation using threads??
/ Vaibhav Gupta
JournalDev •July 27, 2018
Is this sentence is correct from your tutorial, We can set different priorities to different Threads
but it doesn’t guarantee that higher priority thread will execute first than lower priority thread? I
think, Priority threads are executed first. If I am wrong, could you please explain in which case
higher priority thread is not executed before lesser priority.
/ Shyam Patil
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 11/19
Show replies
JournalDev •May 12, 2018
Here body contains single statement, so curly braces is Optional Right ? Thread t = new
Thread(() /> {System.out.println(“My Runnable”);}); Can be written as Thread t = new Thread(() -
> System.out.println(“My Runnable”));
/ Jramapurath
JournalDev •February 15, 2018
This is quiet helpful , good stuff and easy to understand good stuff is available at below link as
well https://www.programinjava.com/2018/02/basics-multithreading-in-java.html
- programinjava
JournalDev •August 28, 2017
hey thanks for this great information on multi threading in java. I have found this really helpful.
Here you covered all the things regarding multi-threading and i was going through the same . It
will be helpful if you post on thread priorities.
https://www.digitalocean.com/community/tutorials/multithreading-in-java 11/19
Show replies
JournalDev •May 12, 2018
Here body contains single statement, so curly braces is Optional Right ? Thread t = new
Thread(() /> {System.out.println(“My Runnable”);}); Can be written as Thread t = new Thread(() -
> System.out.println(“My Runnable”));
/ Jramapurath
JournalDev •February 15, 2018
This is quiet helpful , good stuff and easy to understand good stuff is available at below link as
well https://www.programinjava.com/2018/02/basics-multithreading-in-java.html
- programinjava
JournalDev •August 28, 2017
hey thanks for this great information on multi threading in java. I have found this really helpful.
Here you covered all the things regarding multi-threading and i was going through the same . It
will be helpful if you post on thread priorities.
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 12/19
/ Mayur kohli
JournalDev •June 18, 2017
please explain about locking mechanism of thread , what type of lock in java. how to implement
it
/ Neeraj
JournalDev •April 25, 2017
how to print states of thread.
- shahebaz
JournalDev •April 20, 2017
Hi Pankaj, I have a doubt. How can we manage performance while 500 threads accessing a
thread safe object? And each thread takes 1 min to complete its task.
/ Aliva
https://www.digitalocean.com/community/tutorials/multithreading-in-java 12/19
/ Mayur kohli
JournalDev •June 18, 2017
please explain about locking mechanism of thread , what type of lock in java. how to implement
it
/ Neeraj
JournalDev •April 25, 2017
how to print states of thread.
- shahebaz
JournalDev •April 20, 2017
Hi Pankaj, I have a doubt. How can we manage performance while 500 threads accessing a
thread safe object? And each thread takes 1 min to complete its task.
/ Aliva
25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
https://www.digitalocean.com/community/tutorials/multithreading-in-java 13/19
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25/12/2023, 00:00 Multithreading in Java - Everything You MUST Know | DigitalOcean
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