通过传递Runnable的相同实例来创建两个线程

Question

Thread runnableInst = new Runnable(){  public void run(){}};

Thread thread1 = new Thread(runnableInst);
Thread thread2 = new Thread(runnableInst);

thread1.start();
thread2.start();

Is it fine to start two thread on the same Object runnableInst ?

Is it good to make this kind of design?

Answer 1

Yes, you can do this but one thing to watch is that both threads will be accessing the instance data of the runnableInst . So you will have to make sure that access is synchronised where necessary.

Answer 2

There's no problem with doing that. However, if you plan on dispatching a lot of parallel tasks, you might want to start using the ExecutorService API.

Answer 3

It is indeed possible. I don't think it is fine or good design in most situations. I like to consider a Runnable instance to be an isolated piece of code that only shares data with other threads through well-defined, safe ways.

Answer 4

Is it fine to start two thread on the same Object runnableInst ?

Yes, it is fine to start two threads on the same Object runnableInst.

Is it good to make this kind of design -- it depends on the use case. For example, if there is nothing related to a read/write on a shared resource, then this is a good design.