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Tribhuvan university > CSIT - 2074 Syllabus > Advanced Java Programming > Old Questions > 2075

Advanced Java Programming - Old Questions

Syllabus Notes Old Questions Unit Wise Questions Question Bank

12. What is a socket? Write client and server programs in which a server program accepts a radius of a circle from the client program. Computes area, sends the computed area to the client program, and displays it by client program.[1+4]

5 marks | Asked in 2075

A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent.


Program

// Server Program

import java.io.*;

import java.net.*;

class Server

{

   public static void main(String args[]) throws IOException

   {

         ServerSocket ss=new ServerSocket(1064);

         System.out.println("Waiting for Client Request");

         Socket s=ss.accept();

         String str;

         BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));

         str=br.readLine();

         System.out.println("Received radius");

         double r=Double.valueOf(str);

         double area=3.14*r*r;

         PrintStream ps=new PrintStream(s.getOutputStream());

         ps.println(String.valueOf(area));

         br.close();

         ps.close();

         s.close();

         ss.close();

    }

}

//Client Program
import java.io.*;
import java.net.*;
class Client
{
   public static void main(String args[]) throws IOException
    {
       Socket s = new Socket(“localhost”,1064);
       String str;
       System.out.println("Enter Radius  :");
       BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
       str = br.readLine();
       PrintStream ps=new PrintStream(s.getOutputStream());
       ps.println(str);
       BufferedReader fs=new BufferedReader(new InputStreamReader(s.getInputStream()));
       String result = fs.readLine();
       System.out.println("Area of the circle is : "+ result);
       br.close();
       fs.close();
       ps.close();
       s.close();
     }
}