java - Can this reference in run() refer to Thread object when implementing Runnable? -

sorry if question unclear

i making simple multithread program has linked list store thread created except main thread. want send signal terminate main thread when other threads have closed , intend making when thread close, remove linked list main thread check if list size == null or not

here code

public class mainprogram {     //some global static variable     static list<thread> threadlist = new linkedlist<thread>();     public void main() throws ioexception {         serversocket serversocket;         serversocket = new serversocket(1234);         while(true){             if(shutdown_handler.shutdown==true){                 //wait other thread close/terminate                 return             }             socket s = serversocket.accept();             clientthread x = new clientthread(s);             thread y = new thread(x);             threadlist.add(y);             y.start();          }     } } 

when shutdown_handler.shutdown==true main check threadlist if null. problem don't know how make thread remove list. have searched, normal object, can create method this

public class someobject {     public static void delete(){         if(list.size = null) return;         list.remove(this);     } } 

however, in case of thread, class implement runnable this reference object not thread stored in list

i recommend using hashmap instead of list. keys can thread name (e.g. thread.getname()) , values threads.

map<string, thread> threadmap = new hashmap<string, thread>(); 

you should create map synchronizedmap (using collections.synchronizedmap(...))

map<string, thread> synchronizedmap = collections.synchronizedmap(threadmap); 

now, whenever construct thread, pass hashmap constructor , thread can hold reference it. therefore, when thread terminate can remove hashmap using own thread name key remove.