Question, in a client server implemention

Question

Question, in a client server implemention using only basic sockets and datagrams, what happens if a method is being called at the server side while the same method is already being called/running for another client?
Example:
Client 1 calls Method 1 at Server Side. Method 1 runs.
Client 2 calls Method 1 at Server Side. Method 1 is still running for Client 1. Does it create another Thread and runs for Client 2? Or do I have to implement a seperate Thread for each Client myself?

Answer 1

Thanks!
Don't want to start a new thread so might as well ask this here,
Is there a way to pass or at least update the value of a variable from the outside into a Thread that is running? And this value needs to be seen and be the same for all Threads.
I am thinking of creating new a class that to hold the value I want to update, and passing an object of the class in to the Threads before they runs. Since objects hold reference to the location of the actual object or something like that; people always get worked up over this if I phrase this incorrectly, but I think I got the point across, so that's okay. If I change the value of the object at runtime in the main method, like assign it with a new value according to user input. All the Threads will get the new value right?
Something like that.
public class valueToUpdate {
String value;
public valueToUpdate(String value) {
this.value = value;
public String getValue() {  
return value;  
public class Main {  
public static void main(String[] args) {  
String str = "abc";  
valueToUpdate vTU = new valueToUpdate(str);  
ThreadClass tc1 = new ThreadClass(vTU);  
Thread thread1 = new Thread(tc1).start();  
ThreadClass tc2 = new ThreadClass(vTU);  
Thread thread2 = new Thread(tc2).start();   
public class ThreadClass implements Runnable {  
valueToUpdate vTU;  
public ThreadClass(valueToUpdate vTU) {  
this.valueToUpdate = valueToUpdate;  
public void run() {  
System.out.println(valueToUpdate.getValue());  
}Okay, something like that. I know I need to add in a TimerTask for ThreadClass too for it to run for a certain period. But if I were to ask for user input at the main method while the TimerTask in running, and I change the value of vTU, will the output for both Threads be changed to the value of the user input?
Or is there a better way to do it?