Java：如何在另一个扩展Thread的类中调用方法，并且该方法是我的主类中的Thread Array的一部分？

Question

I have a simple main class which listens on a socket, and adds (networked) clients to an array of Threads as they join in ( like a server listening for new chat clients , and adding each client as a thread , and maintaining the list of threads as an array).

Other things are working, these are the code lines where the server listens and adds a new client to an array of threads called thdRunningClientsPool[]

//add a new ClientHandler type object( ClientHandler class extends Thread) to my Thread Array
public void run() {
............
 thdRunningClientsPool[intRunningClients]= new 
                   Thread( new ClientHandler(clientSocket));
 thdRunningClientsPool[intRunningClients].start();

Now, The ClientHandler class has a method void SendMessage(string Message)

How do I send a message using this SendMessage method after a new client is added? When I use this

thdRunningClientsPool[intRunningClients].SendMessage("hi");

The SendMessage method is not found. Java is treating thdRunningClientsPool(intRunningClients) as a thread, not as a object of ClientHandler class and so I can't acces my SendMessage method.

How can I fix this? Any advice greatly appreciated :) THxxx

Answer 1

First, general advice: use implements Runnable instead of extends Thread . Will save you a lot of headaches down the road.

As for your question, you can't call sendMessage on the Thread instance that was passed your instance as an argument. You must change the code to hold references to your ClientHandler s; you don't really need the array of outer Thread instances. Just start them and let go of them.

You should also reconsider your choice to start all those threads on your own, this is usually a bad idea because it wastes system resources. However, redesigning that aspect of your code is beyond the scope of your question.