مساعدة مستعجلة

Client side

/**
 *
 * @author Mahmoud Kelany
 */
import java.io.*;
import java.net.*;
import java.util.Scanner;

public class clientSide {

	public static void main(String[] args) {

//declare ouputToServer object from DateOuputSream to send data to socket "server"
    	DataOutputStream outputToServer = null;

    	try {
//declare a string to store serverName "or we can use IP address instead of".
        	String serverName = "localhost";

//declare an integer to store port #
        	int port = 3000;

//create client socket
        	Socket socket = new Socket(serverName, port);

// Create an output stream to send data to the server
        	outputToServer = new DataOutputStream(socket.getOutputStream());
    	} //exception handling
    	catch (IOException ex) {
        	System.out.println("error ... no connection with server \n");
    	}
//declare a string to store message from client to be sent to server
    	String clientMessage = "Hello Server";

    	try {
        	Scanner input = new Scanner(System.in);
        	System.out.println("start connection with server\n");
        	outputToServer.writeUTF("client says : " + clientMessage);

        	System.out.println("Enter first number");
        	int num1 = input.nextInt();
        	outputToServer.writeInt(num1);
        	///
        	System.out.println("Enter second number");
        	int num2 = input.nextInt();
        	outputToServer.writeInt(num2);
        	///
        	System.out.println("Enter operation");
        	String op = input.next();
        	outputToServer.writeUTF(op);
        	//write clientMessage to socket
        	outputToServer.flush();

    	} //exception handling
    	catch (IOException e) {
        	System.out.println("Error ... no connection with server ");
    	}
    	try {
//close output sream
        	outputToServer.close();
        	System.out.println("connection terminated\n");
    	} //exception handling
    	catch (IOException e) {
        	System.out.println("Error tearing down socket connection: ");
    	}
	}
}

Server side

/**
 *
 * @author Mahmoud Kelany
 */
import java.io.*;

import java.net.*;

public class serverSide {

	public static void main(String[] args) {
//declare inputFromClient object from DateInuputSream to get data from socket "client"
    	DataInputStream inputFromClient = null;
//initialize port number
    	int port = 3000;
    	try {
//create serverSocket to recive client request
        	ServerSocket server = new ServerSocket(port);

//print a message tell about listening to the port
        	System.out.println("listening to port : " + port);

//declare a string to store message coming from client
        	String clientMessage = null;

//create a new socket to connect with client and accept the connection
        	Socket socket = server.accept();


//create input stream to read data from socket comming from client
        	inputFromClient = new DataInputStream(socket.getInputStream());

// Create an output stream to send data to the client
        	clientMessage = inputFromClient.readUTF();
        	//print serverMessage to server screen
        	System.out.println("\n" + clientMessage + "\n");
        	int num1 = inputFromClient.readInt();
        	int num2 = inputFromClient.readInt();
        	String op = inputFromClient.readUTF();
        	char operation = op.charAt(0);
        	switch (operation) {
            	case '+':
                	System.out.println(num1 + "+" + num2 + "=" + (num1 + num2));
                	break;
            	case '-':
                	System.out.println(num1 + "-" + num2 + "=" + (num1 - num2));
                	break;
            	case '*':
                	System.out.println(num1 + "*" + num2 + "=" + (num1 * num2));
                	break;
            	case '/':
                	System.out.println(num1 + "/" + num2 + "=" + (num1 / num2));
                	break;
            	default:
                	System.out.println("Error opertaion");
        	}

    	} //exception handlingopertation
    	catch (IOException ex) {
        	System.out.println("error ... no connection with client\n");
    	}
    	try {
//close input stream
        	inputFromClient.close();

        	System.out.println("connection terminated\n");
    	} //exception handling
    	catch (IOException e) {
        	System.out.println("Error tearing down socket connection: ");
    	}
	}
}

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