Server.java

import java.io.*;
import java.net.*;
import java.util.*;

public class Server2 extends Thread{
	Scanner scan;
	Socket socket;
	PrintWriter pWriter;

	Server2(Socket socket){
		this.socket = socket;
	}

	public void run(){
		int num;
		String message;
		try{
			System.out.println("Waiting for the client to message: ");
			scan = new Scanner(socket.getInputStream());
			pWriter = new PrintWriter(socket.getOutputStream(),true);
		do{
			num = 0;
			message = scan.nextLine();
			for(int i=0; i<message.length(); i++){
				if(Character.isDigit(message.charAt(i))){
					num++;
				}
			}
			pWriter.println("The number of digit occured in a string is: " + num);
		}while(!message.equalsIgnoreCase("bye"));
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

	 class Thread{
		static Thread t;
		static Socket socket;

	public static void main(String []args){
			try{
				ServerSocket sSocket = new ServerSocket(1111);
				while(true){
					socket = sSocket.accept();
					t = new Thread();
				}
			}catch(Exception e){
				e.printStackTrace();
			}
		}
	}