Client.java

import java.io.*;
import java.net.*;
public class Client2 {
    public static void main(String[] args) {
String hostname = "localhost";
int port = 6789;

        Socket clientSocket = null; 
        DataOutputStream os = null;
        BufferedReader is = null;
        try {
            clientSocket = new Socket(hostname, port);
            os = new DataOutputStream(clientSocket.getOutputStream());
            is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: " + hostname);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: " + hostname);
        }
if (clientSocket == null || os == null || is == null) {
    System.err.println( "Something is wrong. One variable is null." );
    return;
}

try {
    while ( true ) {
System.out.print( "Enter an integer (0 to stop connection, -1 to stop server): " );
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String keyboardInput = br.readLine();
os.writeBytes( keyboardInput + "\n" );

int n = Integer.parseInt( keyboardInput );
if ( n == 0 || n == -1 ) {
    break;
}
String responseLine = is.readLine();
System.out.println("Server returns its square as: " + responseLine);
    }
    os.close();
    is.close();
    clientSocket.close(); 
} catch (UnknownHostException e) {
    System.err.println("Trying to connect to unknown host: " + e);
} catch (IOException e) {
    System.err.println("IOException:  " + e);
}
    }          
}

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