implements Runnable vs extends Thread in Java

Question

From what time I ve spent with threads in Java  I ve found these two ways to write threads   With implements Runnable   public class MyRunnable implements Runnable       public void run               Code           Started with a  new Thread new MyRunnable    start    call   Or  with extends Thread   public class MyThread extends Thread       public MyThread             super  MyThread              public void run               Code           Started with a  new MyThread   start    call   Is there any significant difference in these two blocks of code

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Difference between Thread and runnable  If  we are creating Thread using Thread class then Number of thread equal to number of object we created    If we are creating thread  by implementing the runnable interface then we can use single object for creating multiple thread So single object is shared by multiple Thread So it will take less memory  So depending upon the requirement if our data is not senstive  So It can be shared between multiple Thread we can used Runnable interface

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I m not an expert  but I can think of one reason to implement Runnable instead of extend Thread  Java only supports single inheritance  so you can only extend one class   Edit  This originally said  Implementing an interface requires less resources   as well  but you need to create a new Thread instance either way  so this was wrong

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Yes  If you call ThreadA call   then  not need to call the start method and run method is call after call the ThreadA class only  But If use the ThreadB call then need to necessary the start thread for call run method  If you have any more help  reply me

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The main difference between Thread and Runnable is  - Thread is like  Worker  execute Runnable  - Runnable is like  Job  to be executed by Thread

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Since this is a very popular topic and the good answers are spread all over and dealt with in great depth  I felt it is justifiable to compile the good answers from the others into a more concise form  so newcomers have an easy overview upfront    You usually extend a class to add or modify functionality  So  if you don t want to overwrite any Thread behavior  then use Runnable  In the same light  if you don t need to inherit thread methods  you can do without that overhead by using Runnable  Single inheritance  If you extend Thread you cannot extend from any other class  so if that is what you need to do  you have to use Runnable  It is good design to separate domain logic from technical means  in that sense it is better to have a Runnable task isolating your task from your runner  You can execute the same Runnable object multiple times  a Thread object  however  can only be started once   Maybe the reason  why Executors do accept Runnables  but not Threads   If you develop your task as Runnable  you have all flexibility how to use it now and in the future  You can have it run concurrently via Executors but also via Thread  And you still could also use call it non-concurrently within the same thread just as any other ordinary type object   This makes it also easier to separate task-logic and concurrency aspects in your unit tests  If you are interested in this question  you might be also interested in the difference between Callable and Runnable

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Runnable because     Leaves more flexibility for the Runnable implementation to extend another class  Separates the code from execution Allows you to run your runnable from a Thread Pool  the event thread  or in any other way in the future    Even if you don t need any of this now  you may in the future  Since there is no benefit to overriding Thread  Runnable is a better solution

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If I am not wrong  it s more or less similar to   What is the difference between an interface and abstract class   extends establishes  Is A  relation  amp  interface provides  Has a  capability   Prefer implements Runnable     If you don t have to extend Thread class and modify Thread API default implementation If you are executing a fire and forget command If You are already extending another class   Prefer  extends Thread      If you have to override any of these Thread methods as listed in oracle documentation page   Generally you don t need to override Thread behaviour  So implements Runnable is preferred for most of the times    On a different note  using advanced ExecutorService or ThreadPoolExecutorService API provides more flexibility and control   Have a look at this SE Question   ExecutorService vs Casual Thread Spawner

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tl dr  implements Runnable is better   However  the caveat is important  In general  I would recommend using something like Runnable rather than Thread because it allows you to keep your work only loosely coupled with your choice of concurrency   For example  if you use a Runnable and decide later on that this doesn t in fact require it s own Thread  you can just call threadA run     Caveat  Around here  I strongly discourage the use of raw Threads   I much prefer the use of Callables and FutureTasks  From the javadoc   A cancellable asynchronous computation     The integration of timeouts  proper cancelling and the thread pooling of the modern concurrency support are all much more useful to me than piles of raw Threads   Follow-up  there is a FutureTask constructor that allows you to use Runnables  if that s what you are most comfortable with  and still get the benefit of the modern concurrency tools   To quote the javadoc   If you don t need a particular result  consider using constructions of the form    Future lt   gt  f   new FutureTask lt Object gt  runnable  null    So  if we replace their runnable with your threadA  we get the following   new FutureTask lt Object gt  threadA  null    Another option that allows you to stay closer to Runnables is a ThreadPoolExecutor   You can use the execute method to pass in a Runnable to execute  the given task sometime in the future    If you d like to try using a thread pool  the code fragment above would become something like the following  using the Executors newCachedThreadPool   factory method    ExecutorService es   Executors newCachedThreadPool    es execute new ThreadA

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Actually  It is not wise to compare Runnable and Thread with each other     This two have a dependency and relationship in multi-threading just like Wheel and Engine relationship of motor vehicle   I would say  there is only one way for multi-threading with two steps  Let me make my point   Runnable  When implementing interface Runnable it means you are creating something which is run able in a different thread  Now creating something which can run inside a thread  runnable inside a thread   doesn t mean to creating a Thread  So the class MyRunnable is nothing but a ordinary class with a void run method  And it s objects will be some ordinary objects with only a method run which will execute normally when called    unless we pass the object in a thread    Thread  class Thread  I would say A very special class with the capability of starting a new Thread which actually enables multi-threading through its start   method   Why not wise to compare  Because we need both of them for multi-threading      For Multi-threading we need two things      Something that can run inside a Thread  Runnable      Something That can start a new Thread  Thread     So technically and theoretically  both of them is necessary to start a thread  one will run and one will make it run  Like Wheel and Engine of motor vehicle    That s why you can not start a thread with MyRunnable you need to pass it to a instance of Thread   But it is possible to create and run a thread only using class Thread because Class Thread implements Runnable so we all know Thread also is a Runnable inside   Finally Thread and Runnable are complement to each other for multithreading  not competitor or replacement

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Thread holds behaviour which is not intended to be accessed    it s synchronized lock is used for join etc  it has methods you can access by accident    however if you sub-class Thread have to consider more Thread is implemented   public class ThreadMain       public int getId             return 12345678             public String getName             return  Hello World              public String getState             return  testing              public void example             new Thread                  Override             public void run                     System out println  id    getId      name    getName      state    getState                             start               public static void main String   args            new ThreadMain   example              If you run this you might expect  id  12345678  name  Hello World  state  testing   however  you are not calling the methods you think you are because you are using the method in Thread not ThreadMain and instead you see something like  id  11  name  Thread-0  state  RUNNABLE

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The best way for most worker threads is to have the threading completely encapsuled in the worker class so that nothing can interfere from the outside and cause unwanted and invalid thread class states   I ve just posted an example  so I ll also share this with you          This worker can only run once     author JayC667     public class ProperThreading        private final Thread        mThread           new Thread    - gt  runWorkingLoop          if you want worker to be able to run multiple times  move initialisation into startThread       private volatile boolean    mThreadStarted    false      private volatile boolean    mStopRequested    false       private final long          mLoopSleepTime       public ProperThreading final long pLoopSleepTime    pass more arguments here  store in members                mLoopSleepTime   pLoopSleepTime             public synchronized void startThread             if  mThreadStarted  throw new IllegalStateException  Worker Thread may only be started once and is already running             mThreadStarted   true          mThread start               private void runWorkingLoop             while   mStopRequested     amp  amp  other checks                    try                      do the magic work here                 Thread sleep mLoopSleepTime                  catch  final InterruptedException e                    break                catch  final Exception e                       do at least some basic handling here  you should NEVER ignore exception unless you know exactly what you re doing  and then it should be commented                                     public synchronized void stopThread             if   mThreadStarted  throw new IllegalStateException  Worker Thread is not even running yet             mStopRequested   true          mThread interrupt

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Separating the Thread class from the Runnable implementation also avoids potential synchronization problems between the thread and the run   method  A separate Runnable generally gives greater flexibility in the way that runnable code is referenced and executed

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This is discussed in Oracle s Defining and Starting a Thread tutorial      Which of these idioms should you use  The first idiom  which employs a   Runnable object  is more general  because the Runnable object can   subclass a class other than Thread  The second idiom is easier to use   in simple applications  but is limited by the fact that your task   class must be a descendant of Thread  This lesson focuses on the first   approach  which separates the Runnable task from the Thread object   that executes the task  Not only is this approach more flexible  but   it is applicable to the high-level thread management APIs covered   later    In other words  implementing Runnable will work in scenarios where your class extends a class other than Thread  Java does not support multiple inheritance  Also  extending Thread will not be possible when using some of the high-level thread management APIs  The only scenario where extending Thread is preferable is in a small application that won t be subject to updates in future  It is almost always better to implement Runnable as it is more flexible as your project grows  A design change won t have a major impact as you can implement many interfaces in java  but only extend one class

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Runnable is an interface  while Thread is a class which implements this interface  From a design point of view  there should be a clean separation between how a task is defined and between how it is executed  The former is the responsibility of a Runnalbe implementation  and the latter is job of the Thread class  In most of the cases implementing Runnable is the right way to follow

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If you want to implements or extends any other class then Runnable interface is most preferable  otherwise  if you do not want any other class to extend or implement then Thread class is preferable    The most common difference is    When you extends Thread class  after that you can   t extend any other class which you required   As you know  Java does not allow inheriting more than one class    When you implements Runnable  you can save space for your class to extend any other class in the future or now    Java doesn t support multiple inheritances  which means you can only extend one class in Java so once you extended Thread class you lost your chance and cannot extend or inherit another class in Java  In Object-oriented programming  extending a class generally means  adding new functionality  and modifying or improving behaviors  If we are not making any modification on Thread then use Runnable interface instead  Runnable interface represents a Task which can be executed by either plain Thread or Executors or any other means  so logical separation of Task as Runnable than Thread is a good design decision  Separating task as Runnable means we can reuse the task and also has the liberty to execute it from different means  since you can not restart a Thread once it completes  again Runnable vs Thread for task  Runnable is winner  Java designer recognizes this and that s why Executors accept Runnable as Task and they have worker thread which executes those task  Inheriting all Thread methods are additional overhead just for representing a Task which can be done easily with Runnable    Courtesy from javarevisited blogspot com  These were some of the notable differences between Thread and Runnable in Java  If you know any other differences on Thread vs Runnable than please share it via comments  I personally use Runnable over Thread for this scenario and recommends to use Runnable or Callable interface based on your requirement   However  the significant difference is   When you extends Thread class  each of your thread creates a unique object and associate with it  When you implements Runnable  it shares the same object to multiple threads

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Yes  implements Runnable is the preferred way to do it  IMO  You re not really specialising the thread s behaviour   You re just giving it something to run  That means composition is the philosophically  quot purer quot  way to go  In practical terms  it means you can implement Runnable and extend from another class as well    and you can also implement Runnable via a lambda expression as of Java 8

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I would say actual task is decoupled from the thread  We can pass around the task to Thread  Executor framework etc in case of Runnable  whereas with extending Thread task is coupled with thread object itself  The task isolation cannot be done in case of extending Thread  It s like we burn the task to Thread object just something like IC chip  and more specifically will not get any handle to task

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Moral of the story   Inherit only if you want to override some behavior   Or rather it should be read as   Inherit less  interface more

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Difference between Extending Thread and Implementing Runnable are

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You can use them jointly  Example    public class A implements Runnable        Override     public void run               while true                System out println  Class A is running            try               Thread sleep 3000             catch  InterruptedException e                   TODO Auto-generated catch block             e printStackTrace                            public class Test        public static void main String   args             Thread myThread  new Thread new A       1         myThread start            System out println   executed after thread A     will never be reached

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By extending the thread class   the derived class can not extend any other base class because java only allow single inheritance  on the contrary  By implementing the runnable interface the class still extend other base class      The most significant difference between implementing Runnable and extending Thread is given below      By extending Thread  derived class itself is a thread object  whereas Implementing Runnable interface it shares the same object to multiple Threads

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Well so many good Answers  I want to add more on this  This will help to understand Extending v s Implementing Thread Extends binds two class files very closely and can cause some pretty hard to deal with code  Both approaches do the same job but there have been some differences  The most common difference is  When you extend Thread class  after that you can   t extend any other class which you required   As you know  Java does not allow inheriting more than one class   When you implement Runnable  you can save space for your class to extend any other class in the future or now   However  one significant difference between implementing Runnable and extending Thread is that by extending Thread  each of your threads has a unique object associated with it  whereas implementing Runnable  many threads can share the same object instance  The following example will help you to understand more clearly   Implement Runnable Interface    class ImplementsRunnable implements Runnable        private int counter   0       public void run             counter            System out println  quot ImplementsRunnable   Counter    quot    counter              Extend Thread class    class ExtendsThread extends Thread        private int counter   0       public void run             counter            System out println  quot ExtendsThread   Counter    quot    counter                  Use the above classes here in main to understand the differences more clearly    public class ThreadVsRunnable        public static void main String args    throws Exception              Multiple threads share the same object          ImplementsRunnable rc   new ImplementsRunnable            Thread t1   new Thread rc           t1 start            Thread sleep 1000      Waiting for 1 second before starting next thread         Thread t2   new Thread rc           t2 start            Thread sleep 1000      Waiting for 1 second before starting next thread         Thread t3   new Thread rc           t3 start                Creating new instance for every thread access          ExtendsThread tc1   new ExtendsThread            tc1 start            Thread sleep 1000      Waiting for 1 second before starting next thread         ExtendsThread tc2   new ExtendsThread            tc2 start            Thread sleep 1000      Waiting for 1 second before starting next thread         ExtendsThread tc3   new ExtendsThread            tc3 start             Output of the above program  ImplementsRunnable   Counter   1 ImplementsRunnable   Counter   2 ImplementsRunnable   Counter   3 ExtendsThread   Counter   1 ExtendsThread   Counter   1 ExtendsThread   Counter   1  In the Runnable interface approach  only one instance of a class is being created and it has been shared by different threads  So the value of counter is incremented for each and every thread access  Whereas  Thread class approach  you must have to create separate instance for every thread access  Hence different memory is allocated for every class instances and each has separate counter  the value remains same  which means no increment will happen because none of the object reference is same  When to use Runnable  Use Runnable interface when you want to access the same resources from the group of threads  Avoid using Thread class here  because multiple objects creation consumes more memory and it becomes a big performance overhead  A class that implements Runnable is not a thread and just a class  For a Runnable to become a Thread  You need to create an instance of Thread and passing itself in as the target  In most cases  the Runnable interface should be used if you are only planning to override the run   method and no other Thread methods  This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class  When there is a need to extend a superclass  implementing the Runnable interface is more appropriate than using the Thread class  Because we can extend another class while implementing Runnable interface to make a thread  I hope this will help

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The simplest explanation would be by implementing Runnable we can assign the same object to multiple threads and each Thread shares the same object states and behavior    For example  suppose there are two threads  thread1 puts an integer in an array and thread2 takes integers from the array when the array is filled up  Notice that in order for thread2 to work it needs to know the state of array  whether thread1 has filled it up or not    Implementing Runnable lets you to have this flexibility to share the object whereas extends Thread makes you to create new objects for each threads therefore any update that is done by thread1 is lost to thread2

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With the release of Java 8  there is now a third option   Runnable is a functional interface  which means that instances of it can be created with lambda expressions or method references   Your example can be replaced with   new Thread    - gt       Code here       start     or if you want to use an ExecutorService and a method reference   executor execute runner  run    These are not only much shorter than your examples  but also come with many of the advantages stated in other answers of using Runnable over Thread  such as single responsibility and using composition because you re not specializing the thread s behaviour  This way also avoids creating an extra class if all you need is a Runnable as you do in your examples

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One reason you d want to implement an interface rather than extend a base class is that you are already extending some other class  You can only extend one class  but you can implement any number of interfaces   If you extend Thread  you re basically preventing your logic to be executed by any other thread than  this   If you only want some thread to execute your logic  it s better to just implement Runnable

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if you use runnable you can save the space to extend to any of your other class

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You should implement Runnable  but if you are running on Java 5 or higher  you should not start it with new Thread but use an ExecutorService instead  For details see  How to implement simple threading in Java

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Can we re-visit the basic reason we wanted our class to behave as a Thread  There is no reason at all  we just wanted to execute a task  most likely in an asynchronous mode  which precisely means that the execution of the task must branch from our main thread and the main thread if finishes early  may or may not wait for the branched path task    If this is the whole purpose  then where do I see the need of a specialized Thread  This can be accomplished by picking up a RAW Thread from the System s Thread Pool and assigning it our task  may be an instance of our class  and that is it   So let us obey the OOPs concept and write a class of the type we need  There are many ways to do things  doing it in the right way matters    We need a task  so write a task definition which can be run on a Thread  So use Runnable   Always remember implements is specially used to impart a behaviour and extends is used to impart a feature property   We do not want the thread s property  instead we want our class to behave as a task which can be run

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Java does not support multiple inheritence so if you extends Thread class then no other class will be extended    For Example  If you create an applet then it must extends Applet class so here the only way to create thread is by implementing Runnable interface

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Simple way to say is  If you implement interface that means you are implementing all methods of it and if you extending the class you are inheriting method of your choice     In this case there is only a one method named Run   so better to implement Runnable interface

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This maybe isn t an answer but anyway  there is one more way to create threads   Thread t   new Thread         public void run                Code here

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Adding my two cents here - Always whenever possible use implements Runnable   Below are two caveats on why you should not use  extends Threads   Ideally you should never extend the Thread class  the Thread class should be made final  At least its methods like thread getId     See this discussion for a bug related to extending Threads   Those who like to solve puzzles can see another side effect of extending Thread  The below code  will print unreachable code when nobody is notifying them    Please see  http   pastebin com BjKNNs2G    public class WaitPuzzle        public static void main String   args  throws InterruptedException           DoNothing doNothing   new DoNothing            new WaitForever doNothing  start            new WaitForever doNothing  start            new WaitForever doNothing  start            Thread sleep 100           doNothing start            while true                Thread sleep 10                         static class WaitForever extends  Thread            private DoNothing doNothing           public WaitForever DoNothing doNothing                this doNothing    doNothing                      Override         public void run                 synchronized  doNothing                    try                       doNothing wait       will wait forever here as nobody notifies here                   catch  InterruptedException e                        e printStackTrace                                      System out println  Unreachable Code                                       static class DoNothing extends Thread             Override         public void run                 System out println  Do Nothing

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I would say there is a third way   public class Something        public void justAnotherMethod               new Thread new Runnable        public void run         instanceOfSomething justAnotherMethod            start      Maybe this is influenced a bit by my recent heavy usage of Javascript and Actionscript 3  but this way your class doesn t need to implement a pretty vague interface like Runnable

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One difference between implementing Runnable and extending Thread is that by extending Thread  each of your threads has a unique object associated with it  whereas implementing Runnable  many threads can share the same object instance   A class that implements Runnable is not a thread and just a class  For a Runnable to be executed by a Thread  you need to create an instance of Thread and pass the Runnable instance in as the target   In most cases  the Runnable interface should be used if you are only planning to override the run   method and no other Thread methods  This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class   When there is a need to extend a superclass  implementing the Runnable interface is more appropriate than using the Thread class  Because we can extend another class while implementing Runnable interface to make a thread  But if we just extend the Thread class we can t inherit from any other class

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Thread class defines several methods that can be overriden by the the extending class  But to create a thread we must override the run   method  Same applies to Runnable as well   However Runnable is a preferred method of creating a thread  The primary reasons are    Since Runnable is an interface  you can extend other classes  But if you extend Thread then that option is gone   If you are not modifying or enhancing a whole lot of Thread functionalities and extending the Thread class is not a preferred way

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Instantiating an interface gives a cleaner separation between your code and the implementation of threads  so I d prefer to implement Runnable in this case

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I find it is most useful to use Runnable for all the reasons mentioned  but sometimes I like to extend Thread so I can create my own thread stopping method and call it directly on the thread I have created

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That s the S of SOLID  Single responsibility    A thread embodies the running context  as in execution context  stack frame  thread id  etc   of the asynchronous execution of a piece of code  That piece of code ideally should be the same implementation  whether synchronous or asynchronous   If you bundle them together in one implementation  you give the resulting object two unrelated causes of change    thread handling in your application  ie  querying and modifying the execution context  algorithm implemented by the piece of code  the runnable part    If the language you use supports partial classes or multiple inheritance  then you can segregate each cause in its own super class  but it boils down to the same as composing the two objects  since their feature sets don t overlap  That s for the theory    In practice  generally speaking  a programme does not need to carry more complexity than necessary  If you have one thread working on a specific task  without ever changing that task  there is probably no point in making the tasks separate classes  and your code remains simpler     In the context of Java  since the facility is already there  it is probably easier to start directly with stand alone Runnable classes  and pass their instances to Thread  or Executor  instances  Once used to that pattern  it is not harder to use  or even read  than the simple runnable thread case

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In the rare case you only run it once  you should extend Thread because of DRY  If you call it multiple times  you should implement Runnable because the same thread should not be restarted

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One thing that I m surprised hasn t been mentioned yet is that implementing Runnable makes your class more flexible   If you extend thread then the action you re doing is always going to be in a thread   However  if you implement Runnable it doesn t have to be   You can run it in a thread  or pass it to some kind of executor service  or just pass it around as a task within a single threaded application  maybe to be run at a later time  but within the same thread    The options are a lot more open if you just use Runnable than if you bind yourself to Thread

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Everyone here seems to think that implementing Runnable is the way to go and I don t really disagree with them but there is also a case for extending Thread in my opinion  in fact you have sort of demonstrated it in your code   If you implement Runnable then the class that implements Runnable has no control over the thread name  it is the calling code that can set the thread name  like so   new Thread myRunnable  WhateverNameiFeelLike      but if you extend Thread then you get to manage this within the class itself  just like in your example you name the thread  ThreadB     In this case you   A  might give it a more useful name for debugging purposes   B  are forcing that that name be used for all instances of that class  unless you ignore the fact that it is a thread and do the above with it as if it is a Runnable but we are talking about convention here in any case so can ignore that possibility I feel    You might even for example take a stack trace of its creation and use that as the thread name   This might seem odd but depending on how your code is structured it can be very useful for debugging purposes   This might seem like a small thing but where you have a very complex application with a lot of threads and all of a sudden things  have stopped   either for reasons of deadlock or possibly because of a flaw in a network protocol which would be less obvious - or other endless reasons  then getting a stack dump from Java where all the threads are called  Thread-1   Thread-2   Thread-3  is not always very useful  it depends on how your threads are structured and whether you can usefully tell which is which just by their stack trace - not always possible if you are using groups of multiple threads all running the same code    Having said that you could of course also do the above in a generic way by creating an extension of the thread class which sets its name to a stack trace of its creation call and then use that with your Runnable implementations instead of the standard java Thread class  see below  but in addition to the stack trace there might be more context specific information that would be useful in the thread name for debugging  a reference to one of many queues or sockets it could processing for example in which case you might prefer to extend Thread specifically for that case so that you can have the compiler force you  or others using your libraries  to pass in certain info  e g  the queue socket in question  for use in the name    Here s an example of the generic thread with the calling stack trace as its name   public class DebuggableThread extends Thread       private static String getStackTrace String name            Throwable t  new Throwable  DebuggableThread-  name           ByteArrayOutputStream os   new ByteArrayOutputStream            PrintStream ps   new PrintStream os           t printStackTrace ps           return os toString               public DebuggableThread String name            super getStackTrace name               public static void main String   args  throws Exception           System out println new Thread             System out println new DebuggableThread  MainTest               and here s a sample of the output comparing the two names   Thread Thread-1 5 main  Thread java lang Throwable  DebuggableThread-MainTest     at DebuggableThread getStackTrace DebuggableThread java 6      at DebuggableThread  lt init gt  DebuggableThread java 14      at DebuggableThread main DebuggableThread java 19   5 main

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1  Extending the thread interface  is like you are making your class to behave as a thread only  Your new class will be like a enhanced thread   jshell gt  public class Test extends Thread         gt  public Test String name          gt  super name          gt           gt  public void run           gt  System out println Thread currentThread   getName            gt           gt       created class Test  jshell gt  Test t1 new Test  MyThread    t1    gt  Thread MyThread 5 main    It creates a thread  not the Test object  So it s going to act like a single thread  You can not share the instance of Test class between threads   2  Implementing the runnable interface   jshell gt  public class Test1 implements Runnable         gt  public void run           gt  System out println Thread currentThread   getName            gt           gt  public String getName           gt  return  testing           gt       created class Test1  jshell gt  Test1 t1 new Test1    t1    gt  Test1 396a51ab  -- gt  this creates Test1 object    This object can be shared across threads by   jshell gt  Thread t1 new Thread t1  Hai    t    gt  Thread Hai 5 main   jshell gt  Thread t new Thread t1  Hai    t    gt  Thread Hai 5 main    I think there s already been a lot that s been discussed on this topic  thought this might be helpful around the basics

[java] "implements Runnable" vs "extends Thread" in Java

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