This document describes how to create a multi-client chatting application using Java as the programming language. It involves creating a client-server model with one server and multiple clients that can communicate in real-time. The key aspects covered include:
- Setting up the server code (ChatServer.java) to accept client connections and broadcast messages to all connected clients.
- Developing the client code (ChatClient.java) to connect to the server, send and receive messages, and display a list of connected clients.
- Implementing graphical interfaces on the client using Swing components to display chat logs, send messages, and see online users.
Detailed code listings and explanations are provided for both the server
The document describes a program for creating a multi-client chatting application using Java Swing. It involves creating a chat server class with methods for accepting client connections, handling message passing between clients, and maintaining a list of connected clients. It also involves creating a chat client class with methods for connecting to the server, sending and receiving messages, and displaying messages and a list of connected clients. The program listing includes the code for the ChatServer and ChatClient classes to implement the client-server architecture for a graphical multi-user chat application.
Laporan multiclient chatting berbasis grafis (gambar)Rara Ariesta
The document describes a program for a multi-client chatting application using Java as the programming language. It involves creating a client-server model with one server and multiple clients that can communicate in real-time. The listing includes the code for the ChatServer class which handles connections from multiple ClientThread objects and broadcasts messages. It also includes the code for the ChatClient class which allows a client to connect to the server, send and receive messages.
This document describes a Java-based chat client-server application that allows users to communicate in real-time. It includes the code for the ChatServer class which handles connections from multiple clients and broadcasts messages. It also includes the code for the ChatClient class which provides a graphical user interface for clients to send and receive messages. The document explains how to set up the application by configuring IP addresses and ensuring firewalls allow connections. It then provides listings of the ChatServer and ChatClient Java code files that implement the core server and client functionality.
This document describes a multi-client chat client-server application created using Java socket programming. It includes the code for the ChatServer.java and ChatClient.java classes. The ChatServer class handles multiple client connections and broadcasts messages to all connected clients. The ChatClient class represents the graphical client interface that connects to the server and allows users to send and receive chat messages. The application allows for multiple clients to simultaneously chat by connecting to a central chat server.
The document discusses socket programming and remote method invocation (RMI). It provides details on socket programming concepts like server sockets, client sockets, and examples of a simple echo server and client. It then covers RMI concepts such as locating and invoking remote objects, writing RMI programs, and using serialization to pass objects between clients and servers.
This document discusses socket programming in Java. It begins by explaining the key classes for socket programming - InetAddress, Socket, ServerSocket, DatagramSocket, DatagramPacket, and MulticastSocket. It then provides examples of TCP client-server applications using Sockets and ServerSockets, UDP client-server applications using DatagramSockets and DatagramPackets, and multicast applications using MulticastSockets. The examples demonstrate how to send and receive data over sockets in both text and binary formats.
This document discusses a program for multi-threaded chatting between multiple PCs/laptops in Java. It provides the code for a MultiThreadChatServer class that can accept up to 10 simultaneous client connections. Each client connection runs in its own thread. It also provides the code for a MultiThreadChatClient class that connects to the chat server and allows the user to read messages from and write messages to the chatroom until exiting. The client and server communicate over a socket connection to allow public and private messaging between multiple connected devices.
The Ring programming language version 1.7 book - Part 7 of 196Mahmoud Samir Fayed
The Ring 1.7 release includes several new features and improvements:
1. A new "Load Package" command allows loading Ring libraries into separate namespaces to avoid conflicts.
2. New ringvm_see() and ringvm_give() functions allow redefining the behavior of the See and Give commands.
3. New ring_state_new() and ring_state_mainfile() functions enable running Ring programs from other Ring programs while controlling state deletion.
4. The Trace library debugger now includes a "callstack" command, and Ring Notepad, RingQt, and other tools received updates and enhancements.
The document describes a program for creating a multi-client chatting application using Java Swing. It involves creating a chat server class with methods for accepting client connections, handling message passing between clients, and maintaining a list of connected clients. It also involves creating a chat client class with methods for connecting to the server, sending and receiving messages, and displaying messages and a list of connected clients. The program listing includes the code for the ChatServer and ChatClient classes to implement the client-server architecture for a graphical multi-user chat application.
Laporan multiclient chatting berbasis grafis (gambar)Rara Ariesta
The document describes a program for a multi-client chatting application using Java as the programming language. It involves creating a client-server model with one server and multiple clients that can communicate in real-time. The listing includes the code for the ChatServer class which handles connections from multiple ClientThread objects and broadcasts messages. It also includes the code for the ChatClient class which allows a client to connect to the server, send and receive messages.
This document describes a Java-based chat client-server application that allows users to communicate in real-time. It includes the code for the ChatServer class which handles connections from multiple clients and broadcasts messages. It also includes the code for the ChatClient class which provides a graphical user interface for clients to send and receive messages. The document explains how to set up the application by configuring IP addresses and ensuring firewalls allow connections. It then provides listings of the ChatServer and ChatClient Java code files that implement the core server and client functionality.
This document describes a multi-client chat client-server application created using Java socket programming. It includes the code for the ChatServer.java and ChatClient.java classes. The ChatServer class handles multiple client connections and broadcasts messages to all connected clients. The ChatClient class represents the graphical client interface that connects to the server and allows users to send and receive chat messages. The application allows for multiple clients to simultaneously chat by connecting to a central chat server.
The document discusses socket programming and remote method invocation (RMI). It provides details on socket programming concepts like server sockets, client sockets, and examples of a simple echo server and client. It then covers RMI concepts such as locating and invoking remote objects, writing RMI programs, and using serialization to pass objects between clients and servers.
This document discusses socket programming in Java. It begins by explaining the key classes for socket programming - InetAddress, Socket, ServerSocket, DatagramSocket, DatagramPacket, and MulticastSocket. It then provides examples of TCP client-server applications using Sockets and ServerSockets, UDP client-server applications using DatagramSockets and DatagramPackets, and multicast applications using MulticastSockets. The examples demonstrate how to send and receive data over sockets in both text and binary formats.
This document discusses a program for multi-threaded chatting between multiple PCs/laptops in Java. It provides the code for a MultiThreadChatServer class that can accept up to 10 simultaneous client connections. Each client connection runs in its own thread. It also provides the code for a MultiThreadChatClient class that connects to the chat server and allows the user to read messages from and write messages to the chatroom until exiting. The client and server communicate over a socket connection to allow public and private messaging between multiple connected devices.
The Ring programming language version 1.7 book - Part 7 of 196Mahmoud Samir Fayed
The Ring 1.7 release includes several new features and improvements:
1. A new "Load Package" command allows loading Ring libraries into separate namespaces to avoid conflicts.
2. New ringvm_see() and ringvm_give() functions allow redefining the behavior of the See and Give commands.
3. New ring_state_new() and ring_state_mainfile() functions enable running Ring programs from other Ring programs while controlling state deletion.
4. The Trace library debugger now includes a "callstack" command, and Ring Notepad, RingQt, and other tools received updates and enhancements.
The document discusses implementing CQRS and event sourcing patterns using RavenDB for persistence. It begins with an example employee management prototype and identifies issues with the initial approach. It then explores improving the model by defining commands, events, and having entities generate events in response to commands. Events are stored in RavenDB to rebuild entity state and allow queries to be answered from the event stream. The document provides examples of handling commands, generating and applying events, and saving events to documents in RavenDB.
1. The code sample provided defines a simple Java class called HelloWorld with a main method that prints "Epic Fail".
2. The class contains a single public static void main method that takes an array of String arguments.
3. Within the main method it prints the text "Epic Fail" without any other processing or output.
The document discusses networking concepts like client-server communication and provides code examples of an echo server and client. It explains how a client and server can communicate by creating sockets to connect to each other on a specified port, then reading from and writing to each other's input and output streams. The document also provides an example of a multi-threaded echo server that handles multiple clients concurrently by creating a new thread for each client. Finally, it discusses a quote server that uses UDP to send a random quote to clients in response to receiving an empty datagram packet from them.
Here are the steps to move the frontend out of the Main class and into its own thread:
1. Create a Frontend class that extends AbstractHandler and implements Runnable
2. Move the frontend handling logic from Main into the run() method of Frontend
3. Add a handleCount field to Frontend of type AtomicInteger
4. In the run() method, periodically log the value of handleCount every 5 seconds
5. In the handle() method, increment handleCount using getAndIncrement() after generating the page
6. From Main, instantiate a Frontend object and call start() on its thread to run asynchronously
This will separate the frontend into its own thread of execution. The handleCount field
MQTT and Java - Client and Broker ExamplesMicha Kops
This document discusses using the Moquette broker and Eclipse Paho client library to implement MQTT messaging in Java. It provides code examples for setting up a Moquette broker configured to run on port 1883, creating an MQTT client in Java using Eclipse Paho to publish messages to a broker, and using a message interceptor class to log published messages on the broker side. The full code example runs a Moquette broker instance and demonstrates an MQTT client publishing and receiving a message through the broker.
The document discusses PHP traits and how they can be used to create reusable XML conversion functionality. A XmlConversion trait is defined that contains a toXml() method to convert a class to XML. This trait uses the abstract getXmlAttributes() method to retrieve attribute data. The trait is used in Person and Log classes, which both gain the toXml() conversion method. Objects of these classes can then be converted to XML.
The document discusses function templates and class templates in C++. It provides examples of defining function templates that can handle arguments and return values of different data types. It also demonstrates how to define class templates where the class can work with variables of different types. The key points are:
1. Function templates allow functions to handle arguments and return values of different data types. Class templates make a class work for variables of any type instead of a single data type.
2. Examples show how to define template functions that can accept and return values of int, float and other types. Class templates are also defined that can work with objects of int and float types.
3. The document explains how to define member functions for
The document describes how to create an Android project in Eclipse to call a JSON web service. It includes:
1. Creating a new Android project called "TestJSONWebService" targeting Android 2.2 with an activity called "TestWebServiceActivity" and package name "parallelminds.webservice.com".
2. The main activity, TestWebServiceActivity, makes a call to the web service using the callWebService() method and parses the JSON response to populate a list view.
3. A second class, CallWebService, implements the call to the web service and returns the JSON response.
This document discusses lexical environments and execution contexts in ECMAScript according to ECMA-262 Edition 5. It explains how lexical environments contain environment records that bind identifiers to values and reference outer environments. Execution contexts contain a lexical environment, variable environment, and this binding. The document provides examples of identifier resolution, function closures, and how the with statement affects lexical and variable environments.
The Ring programming language version 1.5.4 book - Part 44 of 185Mahmoud Samir Fayed
This document contains code for classes that provide functionality for database operations and model-view-controller (MVC) patterns in Ring.
The Database class handles database connections and queries. The ModelBase class extends Database and provides methods for CRUD operations on a database table based on the class name. The ControllerBase class sets up an associated view and model based on its class name and provides routing functionality. Together these classes provide a framework for building MVC-based applications with Ring that interact with a database.
This document discusses input/output (I/O) and file system access in Java. It covers the java.io.File and java.nio.file.Path classes for representing files and directories, and how to use them to check file/directory attributes, resolve paths, and manipulate files and directories by creating, deleting, copying, moving, etc. It also covers the java.io streams for byte and character I/O including InputStream, OutputStream, Reader, and Writer. Common stream operations like copying from input to output streams are demonstrated.
The document discusses Node.js and provides instructions for installing Node.js via different methods:
1) Homebrew can be used to install Node.js on OSX by running "brew install node.js".
2) nDistro allows creating and installing Node.js distributions within seconds by specifying module and Node binary version dependencies in a .ndistro file.
3) Node.js can be compiled from source by cloning the Node.js repository via git or downloading the source, running configuration, make, and make install commands.
The document discusses using asynchronous SQL queries in Flex applications to avoid freezing the user interface. It proposes using a StatementList class to encapsulate executing multiple SQL statements as a transaction in an asynchronous manner. The key points are:
1) Synchronous SQL queries can freeze the UI, so asynchronous queries are preferable.
2) A StatementList class is created to execute multiple SQL statements as a transaction asynchronously without locking the UI.
3) An ExecutionQueue class is introduced to schedule StatementList objects to ensure proper execution order without locking.
The document discusses Groovy, a dynamic language for the Java Virtual Machine. It has features from Python, Ruby, and Smalltalk, but uses Java-like syntax. Examples show Hello World programs in Java and Groovy. Later sections discuss Grails, a web framework for Groovy, and G*Magazine, a publication about Groovy. The document contains code samples for defining a Book domain class in Grails, implementing services with Spring Security annotations, writing Spock specifications, and Geb tests using the Page Object pattern.
This document compares and contrasts Clojure and Elixir programming languages. It provides an overview of their origins, syntax, concurrency models, macro systems, and further reading recommendations. Key points include Clojure running on the JVM while Elixir runs on the BEAM VM, both having Lisp-like syntax with differences in collection types, and both supporting metaprogramming through macros while having different macro expansion approaches.
Chat application in java using swing and socket programming.Kuldeep Jain
The document provides code for a chat application with client and server functionality. The server runs on port 1004 and handles socket connections from multiple clients. It maintains lists of connected clients and logged in user names. When a new client connects, threads are started to handle message receiving/sending and updating other clients on user name changes. The client GUI allows users to view online users, sent messages and send new messages which are broadcast to all connected clients by the server.
The document describes a program for a multi-client chat client-server application using Java graphical programming. It includes the code for the ChatServer class that handles connections from multiple clients and broadcasts messages. It also includes the code for the ChatClient class that allows a client to connect to the server, send and receive messages, and view an online users list. The program allows for real-time text communication between multiple clients connected to a central server.
Hi, I need some one to help me with Design a client-server Chat so.pdffashiongallery1
Given the statement:
For every integer n > 2, n^2 – 6n + 1 > 0.
Is the text below a correct proof of the statement? (YES or NO? Explains your choice.)
Proof: By induction
Let S[n] be the statement that n^2 – 6n + 1 > 0
We show that if S[k] is true for some integer k > 2 then S[k + 1] is also true.
Suppose that k^2 – 6k + 1 > 0 (Induction Hypothesis)
Then (k + 1)^2 – 6(k + 1) + 1 = k^2 + 2k + 1 – 6k – 6 + 1 = (k^2 – 6k + 1) + (2k – 5)
Both bracketed expressions are positive: the first by the Induction Hypothesis, and the second
because k > 2. So S[k + 1] is true.
By PMI, S[n] is true for all n > 2.
Solution
There is nothing wrong in your proof.
BUT given statement is for every integer n > 2, n^2 - 6n +1 > 0
This is False.
Reason: for n = 3
3^2 - 6*3 + 1 = -8
-8 is not greater than zero.
So Given statement is wrong.
It would have been true if the statement is
for every integer n > 5, n^2 - 6n + 1 > 0
Let me know in the comments, if you have any doubt..
The document discusses implementing CQRS and event sourcing patterns using RavenDB for persistence. It begins with an example employee management prototype and identifies issues with the initial approach. It then explores improving the model by defining commands, events, and having entities generate events in response to commands. Events are stored in RavenDB to rebuild entity state and allow queries to be answered from the event stream. The document provides examples of handling commands, generating and applying events, and saving events to documents in RavenDB.
1. The code sample provided defines a simple Java class called HelloWorld with a main method that prints "Epic Fail".
2. The class contains a single public static void main method that takes an array of String arguments.
3. Within the main method it prints the text "Epic Fail" without any other processing or output.
The document discusses networking concepts like client-server communication and provides code examples of an echo server and client. It explains how a client and server can communicate by creating sockets to connect to each other on a specified port, then reading from and writing to each other's input and output streams. The document also provides an example of a multi-threaded echo server that handles multiple clients concurrently by creating a new thread for each client. Finally, it discusses a quote server that uses UDP to send a random quote to clients in response to receiving an empty datagram packet from them.
Here are the steps to move the frontend out of the Main class and into its own thread:
1. Create a Frontend class that extends AbstractHandler and implements Runnable
2. Move the frontend handling logic from Main into the run() method of Frontend
3. Add a handleCount field to Frontend of type AtomicInteger
4. In the run() method, periodically log the value of handleCount every 5 seconds
5. In the handle() method, increment handleCount using getAndIncrement() after generating the page
6. From Main, instantiate a Frontend object and call start() on its thread to run asynchronously
This will separate the frontend into its own thread of execution. The handleCount field
MQTT and Java - Client and Broker ExamplesMicha Kops
This document discusses using the Moquette broker and Eclipse Paho client library to implement MQTT messaging in Java. It provides code examples for setting up a Moquette broker configured to run on port 1883, creating an MQTT client in Java using Eclipse Paho to publish messages to a broker, and using a message interceptor class to log published messages on the broker side. The full code example runs a Moquette broker instance and demonstrates an MQTT client publishing and receiving a message through the broker.
The document discusses PHP traits and how they can be used to create reusable XML conversion functionality. A XmlConversion trait is defined that contains a toXml() method to convert a class to XML. This trait uses the abstract getXmlAttributes() method to retrieve attribute data. The trait is used in Person and Log classes, which both gain the toXml() conversion method. Objects of these classes can then be converted to XML.
The document discusses function templates and class templates in C++. It provides examples of defining function templates that can handle arguments and return values of different data types. It also demonstrates how to define class templates where the class can work with variables of different types. The key points are:
1. Function templates allow functions to handle arguments and return values of different data types. Class templates make a class work for variables of any type instead of a single data type.
2. Examples show how to define template functions that can accept and return values of int, float and other types. Class templates are also defined that can work with objects of int and float types.
3. The document explains how to define member functions for
The document describes how to create an Android project in Eclipse to call a JSON web service. It includes:
1. Creating a new Android project called "TestJSONWebService" targeting Android 2.2 with an activity called "TestWebServiceActivity" and package name "parallelminds.webservice.com".
2. The main activity, TestWebServiceActivity, makes a call to the web service using the callWebService() method and parses the JSON response to populate a list view.
3. A second class, CallWebService, implements the call to the web service and returns the JSON response.
This document discusses lexical environments and execution contexts in ECMAScript according to ECMA-262 Edition 5. It explains how lexical environments contain environment records that bind identifiers to values and reference outer environments. Execution contexts contain a lexical environment, variable environment, and this binding. The document provides examples of identifier resolution, function closures, and how the with statement affects lexical and variable environments.
The Ring programming language version 1.5.4 book - Part 44 of 185Mahmoud Samir Fayed
This document contains code for classes that provide functionality for database operations and model-view-controller (MVC) patterns in Ring.
The Database class handles database connections and queries. The ModelBase class extends Database and provides methods for CRUD operations on a database table based on the class name. The ControllerBase class sets up an associated view and model based on its class name and provides routing functionality. Together these classes provide a framework for building MVC-based applications with Ring that interact with a database.
This document discusses input/output (I/O) and file system access in Java. It covers the java.io.File and java.nio.file.Path classes for representing files and directories, and how to use them to check file/directory attributes, resolve paths, and manipulate files and directories by creating, deleting, copying, moving, etc. It also covers the java.io streams for byte and character I/O including InputStream, OutputStream, Reader, and Writer. Common stream operations like copying from input to output streams are demonstrated.
The document discusses Node.js and provides instructions for installing Node.js via different methods:
1) Homebrew can be used to install Node.js on OSX by running "brew install node.js".
2) nDistro allows creating and installing Node.js distributions within seconds by specifying module and Node binary version dependencies in a .ndistro file.
3) Node.js can be compiled from source by cloning the Node.js repository via git or downloading the source, running configuration, make, and make install commands.
The document discusses using asynchronous SQL queries in Flex applications to avoid freezing the user interface. It proposes using a StatementList class to encapsulate executing multiple SQL statements as a transaction in an asynchronous manner. The key points are:
1) Synchronous SQL queries can freeze the UI, so asynchronous queries are preferable.
2) A StatementList class is created to execute multiple SQL statements as a transaction asynchronously without locking the UI.
3) An ExecutionQueue class is introduced to schedule StatementList objects to ensure proper execution order without locking.
The document discusses Groovy, a dynamic language for the Java Virtual Machine. It has features from Python, Ruby, and Smalltalk, but uses Java-like syntax. Examples show Hello World programs in Java and Groovy. Later sections discuss Grails, a web framework for Groovy, and G*Magazine, a publication about Groovy. The document contains code samples for defining a Book domain class in Grails, implementing services with Spring Security annotations, writing Spock specifications, and Geb tests using the Page Object pattern.
This document compares and contrasts Clojure and Elixir programming languages. It provides an overview of their origins, syntax, concurrency models, macro systems, and further reading recommendations. Key points include Clojure running on the JVM while Elixir runs on the BEAM VM, both having Lisp-like syntax with differences in collection types, and both supporting metaprogramming through macros while having different macro expansion approaches.
Chat application in java using swing and socket programming.Kuldeep Jain
The document provides code for a chat application with client and server functionality. The server runs on port 1004 and handles socket connections from multiple clients. It maintains lists of connected clients and logged in user names. When a new client connects, threads are started to handle message receiving/sending and updating other clients on user name changes. The client GUI allows users to view online users, sent messages and send new messages which are broadcast to all connected clients by the server.
The document describes a program for a multi-client chat client-server application using Java graphical programming. It includes the code for the ChatServer class that handles connections from multiple clients and broadcasts messages. It also includes the code for the ChatClient class that allows a client to connect to the server, send and receive messages, and view an online users list. The program allows for real-time text communication between multiple clients connected to a central server.
Hi, I need some one to help me with Design a client-server Chat so.pdffashiongallery1
Given the statement:
For every integer n > 2, n^2 – 6n + 1 > 0.
Is the text below a correct proof of the statement? (YES or NO? Explains your choice.)
Proof: By induction
Let S[n] be the statement that n^2 – 6n + 1 > 0
We show that if S[k] is true for some integer k > 2 then S[k + 1] is also true.
Suppose that k^2 – 6k + 1 > 0 (Induction Hypothesis)
Then (k + 1)^2 – 6(k + 1) + 1 = k^2 + 2k + 1 – 6k – 6 + 1 = (k^2 – 6k + 1) + (2k – 5)
Both bracketed expressions are positive: the first by the Induction Hypothesis, and the second
because k > 2. So S[k + 1] is true.
By PMI, S[n] is true for all n > 2.
Solution
There is nothing wrong in your proof.
BUT given statement is for every integer n > 2, n^2 - 6n +1 > 0
This is False.
Reason: for n = 3
3^2 - 6*3 + 1 = -8
-8 is not greater than zero.
So Given statement is wrong.
It would have been true if the statement is
for every integer n > 5, n^2 - 6n + 1 > 0
Let me know in the comments, if you have any doubt..
The document discusses socket programming in Java. It covers key concepts like layers of protocols, ports, the client-server model, and socket classes. Example code is provided to demonstrate how to create simple client and server applications using sockets to connect two processes and exchange data between them. The examples show how to bind sockets, send/receive data over input/output streams, and handle multiple concurrent connections by spawning new threads.
Note Use Java Write a web server that is capable of processing only.pdffatoryoutlets
Many mathematical problems require the addition, subtraction, and multiplication of two
matrices. Write an ADT Matrix. You may use the following class definition. const int
MAX_ROWS = 10; const int MAX_COLS = 10; class MatrixType { public: MatrixType(); void
MakeEmpty(); void SetSize(int rowsSize, int colSize); void StoreItem(int item, int row, int col);
void Add(MatrixType otherOperand, MatrixType& result); void Sub(MatrixType otherOperand,
MatrixType& result); void Mult(MatrixType otherOperand, MatrixType& result); void
Print(ofstream& outfile); bool AddSubCompatible(MatrixType otherOperand); bool
MultCompatible(MatrixType otherOperand); private: int values[MAX_ROWS][MAX_COLS];
int numRows; int numCols; }; Before you start looking at how to implement this class, you must
determine and document the appropriate preconditions and postconditions for each operation.
Note that the class provides the member functions to allow the client to determine if the binary
matrix operations are possible. Before this class can become a permanent part of your program
library, it must be thoroughly tested. Write a menu driven testing program to test your
MatrixType. Test Driver The test driver should handle the following options. (See processing
notes for definition of ). GetNewMatrix Number of rows and number of columns are on the next
line. Values for each row and column AddMatrices Add first and second, leaving the result in the
third SubMatrices Subtract second from first, leaving the result in the third MultiplyMatrices
Multiply first and second, leaving the result in the third PrintMatrix Print the matrix one row per
line on DataOut Quit Processing Notes 1. is a number between 0 and 9. This value is used as an
index into an array of MatrixType. 2. The main function must include a Switch statement where
the case expression is a user-defined enumeration type. This means that the command is
recognized and its enumeration equivalent is sent back to be used in the case statement. 3. The
driver must ensure the preconditions of the member functions of MatrixType. Throw an
exception if an error occurs and continue processing.
Solution
#include
#include
using namespace std;
struct matrixType{
int matDimension;
int matValues[10][10];
};
class MatrixADT{
private:
matrixType resultMatrix;
public:
void intializeResultMatrix(int);
matrixType add(matrixType, matrixType);
matrixType subtract(matrixType,matrixType);
matrixType multiply(matrixType,matrixType);
void printResult();
};
matrixType MatrixADT::add(matrixType M1, matrixType M2){
}
matrixType MatrixADT::subtract(matrixType M1, matrixType M2){
}
matrixType MatrixADT::multiply(matrixType M1, matrixType M2){
}
void MatrixADT::intializeResultMatrix(int dim){
}
int main(){
MatrixADT maX;
matrixType M1, M2;
char op;
int dim;
maX.printResult();
}
void MatrixADT::printResult(){
int i,j;
for (i=0;i
for (j=0; j
cout<.
The document discusses Java network programming and communication between applications. It covers topics like Java source code compilation, client-server models, sockets, ports, TCP and UDP clients and servers in Java code. It provides examples of Java code for TCP client, TCP server, UDP client and UDP server. It also discusses Remote Procedure Calls (RPC) and gives an example of implementing average calculation using RPC.
This document discusses using Arduino boards for real-time web interactions. It provides an overview of networking Arduino boards, examples of web servers and clients using Arduino, and an example of streaming live sensor temperature data from Arduino boards to a web display. Resources for web sockets and real-time architectures are also presented. The document argues that real-time web interactions are important for applications like sensor networks, web-controlled installations, and machine-to-machine communication.
This document discusses using Codable types in Kitura to build RESTful APIs with routing in Swift. It introduces JSON encoding and decoding using Codable, shows examples of defining Codable model types and implementing GET, POST, and query parameter handlers, and discusses benefits like type safety, code sharing between backend and clients.
This document discusses socket programming concepts in Java including server-client communication using sockets, the InetAddress class and its methods like getLocalHost(), getByName(), and getAllByName(), and the Socket and ServerSocket classes. It provides code examples to demonstrate how to use these classes and methods to establish connections between a client and server and exchange data over the network.
Interprocess communication (IPC) allows processes to communicate through message passing. There are two main forms of IPC - synchronous which blocks sending and receiving processes, and asynchronous which is non-blocking for sending. IPC uses protocols like TCP and UDP, with TCP providing reliable, ordered streams and UDP providing unreliable datagram delivery. For communication, data must be serialized into a byte sequence and deserialized on the receiving end.
Socket programming allows applications on networked computers to communicate reliably using TCP or unreliably using UDP. A socket represents an open connection between two endpoints and has methods to get input/output streams, the remote host/port, and local port. A client socket connects to a server, while a server socket listens on a port and accepts connections from clients.
The document discusses different types of sockets in Java network programming:
- TCP/IP client socket and TCP/IP server socket are used for reliable, bidirectional stream-based connections between hosts using TCP/IP. The client socket connects to the server socket.
- A Java DatagramSocket class represents a connectionless socket for sending and receiving datagram packets without reliability or sequencing. Commonly used DatagramSocket constructors are described.
- An example program is provided to demonstrate passing a message from a server to a client using sockets, showing the client and server code.
The document discusses security vulnerabilities in a simple Java web server code example. It shows how an attacker could cause a denial of service attack by sending a malformed HTTP request. To prevent this, the code needs to handle exceptions carefully by disconnecting from any client that sends a malformed request. The document also emphasizes the importance of careful exception handling in building security into applications from the start.
- JavaMail API provides a way to send and receive emails in Java through core classes like Session, Message, InternetAddress, and Transport. It supports SMTP, POP3, and IMAP protocols.
- To send an email, create a Message, set the from/to addresses, and use Transport to send it through an SMTP server. To receive emails, use a POP3 or IMAP store to access messages in a mailbox folder.
- Attachments, HTML content, authentication, and searching emails are also supported through the API classes. Other providers extend JavaMail for features like NNTP and S/MIME encryption.
The document discusses different ways to implement threading in Java programs. It provides code examples to demonstrate creating threads by extending the Thread class and implementing the Runnable interface. The code examples show printing output from both the main thread and child threads to illustrate threading concepts. Socket programming and RMI examples are also provided with code to implement client-server applications using threads.
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06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Data and AI
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https://www.meetup.com/unstructured-data-meetup-new-york/
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End-to-end pipeline agility - Berlin Buzzwords 2024Lars Albertsson
We describe how we achieve high change agility in data engineering by eliminating the fear of breaking downstream data pipelines through end-to-end pipeline testing, and by using schema metaprogramming to safely eliminate boilerplate involved in changes that affect whole pipelines.
A quick poll on agility in changing pipelines from end to end indicated a huge span in capabilities. For the question "How long time does it take for all downstream pipelines to be adapted to an upstream change," the median response was 6 months, but some respondents could do it in less than a day. When quantitative data engineering differences between the best and worst are measured, the span is often 100x-1000x, sometimes even more.
A long time ago, we suffered at Spotify from fear of changing pipelines due to not knowing what the impact might be downstream. We made plans for a technical solution to test pipelines end-to-end to mitigate that fear, but the effort failed for cultural reasons. We eventually solved this challenge, but in a different context. In this presentation we will describe how we test full pipelines effectively by manipulating workflow orchestration, which enables us to make changes in pipelines without fear of breaking downstream.
Making schema changes that affect many jobs also involves a lot of toil and boilerplate. Using schema-on-read mitigates some of it, but has drawbacks since it makes it more difficult to detect errors early. We will describe how we have rejected this tradeoff by applying schema metaprogramming, eliminating boilerplate but keeping the protection of static typing, thereby further improving agility to quickly modify data pipelines without fear.
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Actionable Insights: Gain the skills to derive actionable insights that drive informed decision-making.
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#DataAnalysis #SQL #LearningSQL #DataInsights #DataScience #Analytics
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1. MEMBUAT PROGRAM MULTICLIENT CHATTING CLIENT-SERVER
MENGGUNAKAN BAHASA PEMROGRAMAN JAVA BERBASIS
GRAFIS
Oleh :
AINI MAISI
(0611 3070 1291)
6CD
JURUSAN TEKNIK KOMPUTER
POLITEKNIK NEGERI SRIWIJAYA
PALEMBANG
2. MEMBUAT PROGRAM MULTICLIENT CHATTING CLIENT-SERVER
MENGGUNAKAN BAHASA PEMROGRAMAN JAVA BERBASIS
GRAFIS
Java merupakan suatu bahasa pemograman yang multi platform dan
multi device. Java juga merupakan bahasa pemograman yang berorientasi objek
dan program java tersusun dari bagian yang disebut kelas.
Dengan Chatting memungkinkan kita untuk selalu bisa berkomunikasi
walaupun kita tidak berada bersamanya di suatu tempat. Aplikasi chatting
merupakan suatu aplikasi yang memungkinkan pengguna (client)
berkomunikasi teks secara langsung (Real Time) dengan pengguna lain dengan
menggunakan media yang ada.
Pada bagian ini, saya akan membuat aplikasi chatting berbasis grafis (seperti
tampilan foto) menggunakan bahasa pemograman java. pertama yang harus
dilakukan adalah menyetting alamat IP pada masing-masing PC. Kita menggunakan
satu server dan satu client.
Pertama yang harus dilakukan kita terlebih dahulu melakukan setting
alamat IP pada masing-masing client. Setelah melakukan konfigurasi IP pada
masing-masingi komputer kemudian kita juga harus memastikan bahwa firewall
pada masing-masing komputer harus diaktifkan karena pada beberapa kasus program
ini tidak dapat saling terkoneksi akibat firewall yang aktif pada sistem operasinya.
Berikut adalah listing program MultiClient Chatting Client-Server
berbasis grafis (gambar)
ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer {
private static int uniqueId;
private ArrayList<ChatServer.ClientThread> clients;
private int port;
3. private boolean keepGoing;
public ChatServer() {
this.port = 9999;
clients = new ArrayList();
}
public void start() {
keepGoing = true;
try {
ServerSocket serverSocket = new ServerSocket(port);
while (keepGoing) {
System.out.println("ChatServer waiting for Clients
on port " + port + ".");
Socket socket = serverSocket.accept();
if (!keepGoing) {
break;
}
ChatServer.ClientThread t = new
ChatServer.ClientThread(socket);
clients.add(t);
t.start();
send("login~" + t.username + "~" + t.username + "
sedang login...~Server~n");
}
try {
serverSocket.close();
for (int i = 0; i < clients.size(); ++i) {
ChatServer.ClientThread tc = clients.get(i);
4. try {
tc.sInput.close();
tc.sOutput.close();
tc.socket.close();
} catch (IOException ioE) {
}
}
} catch (Exception e) {
System.out.println("Exception closing the server
and clients: " + e);
}
} catch (IOException e) {
String msg = "Exception on new ServerSocket: " + e +
"n";
System.out.println(msg);
}
}
private synchronized void send(String message) {
for (int i = clients.size(); --i >= 0;) {
ChatServer.ClientThread ct = clients.get(i);
if (!ct.writeMsg(message)) {
clients.remove(i);
System.out.println("Disconnected Client " +
ct.username + " removed from list.");
}
}
}
5. private String getClients() {
String s = "";
for (ClientThread clientThread : clients) {
s += clientThread.username + ":";
}
s += "---";
System.out.println(s);
return s;
}
private synchronized void remove(int id) {
for (int i = 0; i < clients.size(); ++i) {
ChatServer.ClientThread ct = clients.get(i);
if (ct.id == id) {
clients.remove(i);
return;
}
}
}
public static void main(String[] args) {
ChatServer server = new ChatServer();
server.start();
}
private class ClientThread extends Thread {
private Socket socket;
13. }
} catch (Exception e) {
}
try {
if (output != null) {
output.close();
}
} catch (Exception e) {
}
try {
if (socket != null) {
socket.close();
}
} catch (Exception e) {
}
}
/**
* This method is called from within the constructor to
initialize the form.
* WARNING: Do NOT modify this code. The content of this
method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated
Code">
private void initComponents() {
14. jScrollPane1 = new javax.swing.JScrollPane();
viewTextArea = new javax.swing.JTextArea();
jScrollPane2 = new javax.swing.JScrollPane();
clientTable = new javax.swing.JTable();
postTextField = new javax.swing.JTextField();
kirimButton = new javax.swing.JButton();
lbljpg = new javax.swing.JLabel(new
ImageIcon("E:/rara.jpg"));
jLabel2 = new javax.swing.JLabel();
serverTextField = new javax.swing.JTextField();
jLabel3 = new javax.swing.JLabel();
portTextField = new javax.swing.JTextField();
masukButton = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
usernameTextField = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE
);
viewTextArea.setEditable(false);
viewTextArea.setColumns(20);
viewTextArea.setLineWrap(true);
viewTextArea.setRows(5);
viewTextArea.setFocusable(false);
jScrollPane1.setViewportView(viewTextArea);
jScrollPane2.setViewportView(clientTable);
23. String res;
String type = msg.split("~")[0];
String pengirim = msg.split("~")[1];
String text = msg.split("~")[2];
String kepada = msg.split("~")[3];
switch (type) {
case "recieveText":
res = pengirim + ": " + text;
viewTextArea.setText(viewTextArea.getText() + res + "n");
break;
case "recievePrivateText":
res = pengirim + ": " + text;
if (kepada.equals(username)) {
viewTextArea.setText(viewTextArea.getText() + res + "n");
}
break;
case "login":
viewTextArea.setText(viewTextArea.getText() + pengirim + " sudah
login..." + "n");
clients.add(pengirim);
break;
case "logout":
viewTextArea.setText(viewTextArea.getText() + pengirim + " telah
logout..." + "n");
clients.remove(pengirim);
break;
case "list":
24. setTable(text);
break;
}
} catch (IOException e) {
System.out.println("Server has close the
connection: " + e);
break;
} catch (ClassNotFoundException e2) {
}
}
}
private void setTable(String text) {
int rows = text.split(":").length - 1;
Object[][] data = new Object[rows][1];
for (int i = 0; i < rows; i++) {
String t = text.split(":")[i];
data[i][0] = t;
}
String[] header = {"Clients"};
clientTable.setModel(new DefaultTableModel(data,
header));
}
}
}
Pastikan kita sudah terhubung ke internet. Lalu eksekusi program
menggunakan ctrl+1 dan ctrl+2, maka tampilan akan seperti berikut: