Can you write a simple threaded server program which accepts multiple clients and find factorial of a number or capitalize a string in java?

try {  
                Socket clientSocket = new Socket("localhost",port);  
                System.out.println("Client Started");  
                InputStreamReader isr = new InputStreamReader(System.in);  
                BufferedReader br = new BufferedReader(isr);  
                PrintStream toServer = new PrintStream(clientSocket.getOutputStream());  
                BufferedReader fromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));  
                String menu = "1. Factorial\n2. Capitalize String\n3. Exit\nEnter your choice: ";  
                int choice = 0;
                do  
                {  
                     toServer.flush();  
                     System.out.println(menu);  
                     choice=Integer.parseInt(br.readLine());  
                     toServer.println(choice);  
                     toServer.flush();  
                     switch(choice)  
                     {  
                     case 1:  
                          System.out.println("Enter a number: ");  
                          int no=Integer.parseInt(br.readLine());  
                          toServer.println(no);  
                          int result=Integer.parseInt(fromServer.readLine());  
                          System.out.println("Factorial of "+ no + ": " +result);  
                          break;
                     case 2:  
                          System.out.println("Enter a string: ");  
                          String word = br.readLine();  
                          toServer.println(word);  
                          String result1 = fromServer.readLine();  
                          System.out.println(word +" in capital: " + result1);  
                          break;
                     case 3:  
                          break;  
                     default:  
                          System.out.println("Invalid Choice!");  
                     }  
                }while(choice!=3);  
           } catch (Exception e) {  
           }  
      }