This document presents a simple example of a TCP/IP client-server application using Java with two programs: server.java and client.java. The server program converts input messages from the client to uppercase and sends them back, while the client program reads a sentence from the user, sends it to the server, and displays the modified response. Both programs have some missing instructions and need additional implementation details to function correctly.

1. TCP/IP Client Server program example
Here is a simple example of client-server operation using two simple Java programs. There are
two programs, Server.java and Client.java.
The server returns the input message with all lowercase letters converted to uppercase.
These programs are missing some instructions.
The server program:
// import packages
classTCPServer {
publicstaticvoidmain(String argv[]) throwsException {
String clientSentence;
String capitalizedSentence;
//create Socket
..
while (true) {
//Connection
BufferedReaderinFromClient =
newBufferedReader(newInputStreamReader(connectionSocket.getInputStream()));
DataOutputStreamoutToClient = newDataOutputStream(connectionSocket.getOutputStream());
clientSentence = inFromClient.readLine(); //read what the client sent
System.out.println("Received: " + clientSentence);
capitalizedSentence = clientSentence.toUpperCase() + 'n';
outToClient.(capitalizedSentence); //writing to client

2. }
}
}
The client program
// Import packages
classTCPClient {
publicstaticvoidmain(String argv[]) throws Exception {
String sentence;
String modifiedSentence;
BufferedReaderinFromUser = newBufferedReader(newInputStreamReader(System.in));
//Connection
.
//Writing in the socket
.
BufferedReaderinFromServer =
newBufferedReader(newInputStreamReader(clientSocket.getInputStream()));
System.out.print("Enter a sentence: ");
sentence = inFromUser.readLine(); //reads a sentancefrom the user
.//send to server
modifiedSentence = inFromServer.readLine(); //recievefrom server
System.out.println("FROM SERVER: " + modifiedSentence);
//Close the socket
.
}

3. }