TCP Protocol | Data Communication and Networking | Example

 Client

import java.net.* ;

import java.io.* ;

import java.util.*;

public class Q1_Client{

    public static void main(String [] args)

    {

        try {

            Scanner scan=new Scanner(System.in);

            Socket skt= new Socket("localhost",0722);

            InputStream in = skt.getInputStream();

            OutputStream out = skt.getOutputStream();

            byte[] sdata=new byte[1024];

            byte[] rdata=new byte[1024];

            System.out.println("\nEnter Number: ");

            int st=scan.nextInt();

            String s=String.valueOf(st);

            sdata=s.getBytes();

            out.write(sdata);

            in.read(rdata);

            String msg=new String(rdata);

            System.out.println("\nSquare of "+st+" is: "+msg);

            out.close();

            skt.close();

            scan.close();

        } catch (Exception e) {

            System.out.println("Didn't get any Data....");

        }

    }

}

Server

import java.net.* ;

import java.io.* ;

import java.util.*;

public class Q1_Server{

    public static void main(String[] args)throws Exception {

        ServerSocket srvr=new ServerSocket(0722);

        Socket skt=srvr.accept();

        System.out.println("\nServer is connected!!");

        OutputStream out = skt.getOutputStream();

        InputStream in = skt.getInputStream();

        byte buf[]=new byte[50];

        in.read(buf);

        String msg=new String(buf);

        int m=Integer.parseInt(msg.trim());

        m=m*m;

        System.out.println("\nSending Data: "+m);

        msg=String.valueOf(m);

        out.write(msg.getBytes());

        in.close();

        //srvr.close();

    }

}

Output

String operations in Java

UDP Protocol

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