//file: Client.java import java.net.*; import java.io.*; public class Client { public static void main( String argv[] ) { try { Socket server = new Socket( argv[0], Integer.parseInt(argv[1]) ); ObjectOutputStream out = new ObjectOutputStream( server.getOutputStream( ) ); ObjectInputStream in = new ObjectInputStream( server.getInputStream( ) ); out.writeObject( new DateRequest( ) ); out.flush( ); System.out.println( in.readObject( ) ); out.writeObject( new MyCalculation( 2 ) ); out.flush( ); System.out.println( in.readObject( ) ); server.close( ); } catch ( IOException e ) { System.out.println( "I/O error " + e ); // I/O error } catch ( ClassNotFoundException e2 ) { System.out.println( e2 ); // unknown type of response object } } }