Lecture 3 Flashcards
What is client-server communication?
Client-server communication refers to the exchange of data between two entities: a client and a server. The client initiates requests, and the server processes these requests and returns responses.
Why is structuring messages in client-server communication important?
Structuring messages ensures that the server has the necessary information to handle and respond to the client’s requests appropriately.
What is the purpose of the String Tokenizer class in Java?
The String Tokenizer class, within the java.util package, breaks down strings into smaller units called tokens based on specified delimiters.
How does String Tokenizer operate?
String Tokenizer scans through the input string, identifies occurrences of specified delimiters, marks the end of a token, and continues this process until the entire string is tokenized.
What is the advantage of using String Tokenizer for client-server communication in a chat application?
String Tokenizer allows efficient parsing of incoming messages, enabling the extraction of relevant information such as the sender, recipient, and message content.
Name the three constructors of the StringTokenizer class.
StringTokenizer(String str)
StringTokenizer(String str, String delim)
StringTokenizer(String str, String delim, boolean returnValue)
What does the StringTokenizer(String str) constructor do?
It creates a StringTokenizer with the specified string.
What does the StringTokenizer(String str, String delim, boolean returnValue) constructor do?
t creates a StringTokenizer with the specified string, delimiter, and returnValue. If returnValue is true, delimiter characters are considered tokens; if false, they serve to separate tokens.
What does the StringTokenizer(String str, String delim) constructor do?
t creates a StringTokenizer with the specified string and delimiter.
What does the hasMoreTokens() method do?
it checks if there are more tokens available.
List some methods of the StringTokenizer class.
boolean hasMoreTokens()
String nextToken()
String nextToken(String delim)
boolean hasMoreElements()
Object nextElement()
int countTokens()
What does the nextToken() method do?
It returns the next token from the StringTokenizer object.
What does the nextToken(String delim) method do?
It returns the next token based on the specified delimiter.
What does the countTokens() method do?
It returns the total number of tokens
Why is string tokenization beneficial in client-server communication?
it ensures uniform message formatting, simplifies parsing, provides flexibility with custom delimiters, offers efficiency, and promotes code maintainability.
What components might a message from a client to a server contain in a chat application?
A message may contain components such as command, sender ID, recipient ID, and message content.
How does String Tokenizer promote efficiency in client-server communication?
By offering optimized performance for parsing complex or large messages, enhancing the responsiveness and scalability of the communication.
Why string tokenizer
It is standard: ensures uniform formatting
Simplified parsing
Flexible: can define custom delimeters and tokenization rules
Efficient
It is maintainable
