array.length returns the number of rows (4)
array[i].length returns the number of columns of row i (3)
So for this 2D array:
- array.length is 4
- array[0].length, array[1].length, array[2].length, array[3].length are all 3
The outer dimension represents rows, the inner dimension represents columns.
VTC Academy THSoft Co.,Ltd 22
Actions on Eclipse
Open Eclipse IDE
Create project: Session2Ex
Create java class: Ex2WithArrays.java
Write code to:
The document discusses using loops to repeatedly execute blocks of code. It introduces the while loop as a way to repeatedly print a string without having to write the print statement hundreds of times. The while loop uses a condition and incrementing counter to control how many times the code block repeats. Examples are provided to trace the execution of a sample while loop.
Se puede encontrar en:
https://github.com/jksrecko/libaria/blob/master/examples/directMotionExample.cpp
Agradesco a la persona que compartio este codigo ya que muestra una idea general de lo que se puede hacer con el robot AmigoBot
jksrecko
The document discusses programming paradigms and introduces aspect-oriented programming (AOP). It provides an example of implementing logging functionality as an aspect to separate cross-cutting concerns from the core program logic. The example of a health monitoring system using remote method invocation (RMI) demonstrates how AOP can help modularize distributed functionality and address issues like tangled and spread code.
Cantonese Opera As Intangible Cultural Heritage港大粵劇教育計劃
This is the presentation at the Symposium on the Politics & Poetics of Asian Intangible Cultural Heritage held at HKU on 17 October 2009.
http://www.hku.hk/sociodep/car/header.htm
The document summarizes an F# conference presentation by Phil Trelford on the benefits of using the F# programming language. It provides information on the F# London Meetup group, describes F# as a statically typed, functional-first, open source .NET language, and gives examples of how tasks are simplified in F# compared to C#. It also shares testimonials from companies that increased productivity after adopting F#.
This document discusses Chapter 2 of an introduction to Java programming textbook. It covers elementary programming concepts such as writing simple Java programs to perform computations, using variables to store data, numeric data types, operators, and literals. The chapter objectives are to learn how to solve practical problems by working with Java primitive data types, variables, input/output, and other basic programming elements.
Chapter 1. java programming language overviewJong Soon Bok
This document provides an overview of the Java programming language and environment. It discusses what Java is, its uses as both a programming language and platform, and the key components of the Java platform including the JRE and JDK. It also covers downloading and installing the JDK, configuring the environment, and creating a simple "Hello World" Java program. The document includes many screenshots to illustrate the various steps and configurations.
The document discusses using loops to repeatedly execute blocks of code. It introduces the while loop as a way to repeatedly print a string without having to write the print statement hundreds of times. The while loop uses a condition and incrementing counter to control how many times the code block repeats. Examples are provided to trace the execution of a sample while loop.
Se puede encontrar en:
https://github.com/jksrecko/libaria/blob/master/examples/directMotionExample.cpp
Agradesco a la persona que compartio este codigo ya que muestra una idea general de lo que se puede hacer con el robot AmigoBot
jksrecko
The document discusses programming paradigms and introduces aspect-oriented programming (AOP). It provides an example of implementing logging functionality as an aspect to separate cross-cutting concerns from the core program logic. The example of a health monitoring system using remote method invocation (RMI) demonstrates how AOP can help modularize distributed functionality and address issues like tangled and spread code.
Cantonese Opera As Intangible Cultural Heritage港大粵劇教育計劃
This is the presentation at the Symposium on the Politics & Poetics of Asian Intangible Cultural Heritage held at HKU on 17 October 2009.
http://www.hku.hk/sociodep/car/header.htm
The document summarizes an F# conference presentation by Phil Trelford on the benefits of using the F# programming language. It provides information on the F# London Meetup group, describes F# as a statically typed, functional-first, open source .NET language, and gives examples of how tasks are simplified in F# compared to C#. It also shares testimonials from companies that increased productivity after adopting F#.
This document discusses Chapter 2 of an introduction to Java programming textbook. It covers elementary programming concepts such as writing simple Java programs to perform computations, using variables to store data, numeric data types, operators, and literals. The chapter objectives are to learn how to solve practical problems by working with Java primitive data types, variables, input/output, and other basic programming elements.
Chapter 1. java programming language overviewJong Soon Bok
This document provides an overview of the Java programming language and environment. It discusses what Java is, its uses as both a programming language and platform, and the key components of the Java platform including the JRE and JDK. It also covers downloading and installing the JDK, configuring the environment, and creating a simple "Hello World" Java program. The document includes many screenshots to illustrate the various steps and configurations.
To write programs for executing statements repeatedly using a while loop (§4.2).
To develop a program for GuessNumber and SubtractionQuizLoop (§4.2.1).
To follow the loop design strategy to develop loops (§4.2.2).
To develop a program for SubtractionQuizLoop (§4.2.3).
To control a loop with a sentinel value (§4.2.3).
To obtain large input from a file using input redirection rather than typing from the keyboard (§4.2.4).
To write loops using do-while statements (§4.3).
To write loops using for statements (§4.4).
To discover the similarities and differences of three types of loop statements (§4.5).
To write nested loops (§4.6).
To learn the techniques for minimizing numerical errors (§4.7).
To learn loops from a variety of examples (GCD, FutureTuition, MonteCarloSimulation) (§4.8).
To implement program control with break and continue (§4.9).
(GUI) To control a loop with a confirmation dialog (§4.10).
This course provides a strong background about JAVA programming language in the field of computing. The course begins with an introductory overview of the Computer and programs, with distinguishes the terms API, IDE and JDK, and gives a comprehensive knowledge about Java development kits and Java integrative development environments like eclipse and NetBeans. Furthermore, the course prepares student to write, compile, run and develop Java applications which are used to find out the solution for several real life problems, in conjunction with using GUI to obtain input, process and display outputs like message dialog boxes, input dialog boxes, confirmation dialog and so on.
JAVA is a computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.
The aim of this course is to explore Java programming fundamentals related to write, compile, run and develop Java applications that are used to discover the solution for several real life problems.
The official learning outcome for this course is: Upon successful completion of the course the students:
• Must know the basic concepts related JAVA programming language.
• Must know how to write, compile, run and develop java applications.
A combination of lectures and practical sessions will be used in this course in order to achieve the aim of the course.
By MSc. Karwan Mustafa Kareem
This document provides information about an Object Oriented Programming course, including:
1. The lecturer's name, room number, email, and phone number.
2. Prerequisites for the course include having taken an introductory programming course and having a basic understanding of programming concepts.
3. Three recommended textbooks for the course are listed.
The document continues to outline the course syllabus, evaluation, teaching outcomes, learning outcomes, requirements to pass, and various Java programming concepts covered in the course.
The document provides an introduction to a course on Java programming. It outlines the course objectives which are to understand core Java concepts like data types, control flow, methods, arrays, and object-oriented programming. It also describes how to get started with Java programming using Eclipse, including how to create, compile, and run a simple Java application that prints "Welcome to Java!". The document discusses Java characteristics and basic Java concepts like packages, keywords, variables, operators, and control structures like if/else statements.
The document discusses different control structures in C programming. It covers for, while, and do-while loops used for iterative execution. It also covers jump statements like continue, break, and goto that change the flow of execution. The for loop uses an initialization, condition, and increment/decrement. The while loop checks a condition before each iteration. The do-while loop checks the condition after executing the body. Continue skips to the next iteration. Break exits the current loop or switch. Goto jumps to a labeled statement.
The document discusses different types of loops in Java including while, do-while, and for loops. It provides examples of how to use each type of loop and highlights some subtleties. It also covers using break and continue statements to alter loop flow, and provides an example programming exercise to write a program that checks if a string is a palindrome using a for loop.
The document discusses various programming concepts in C# such as random number generation, Boolean expressions, control statements like if/else, switch, for, while and do-while loops. It also covers nested loops, break and continue statements, and provides examples of problems that can be solved using these programming constructs like generating random numbers, printing patterns, and simulating dice rolls.
1) The document discusses different types of loops in Java including while, do-while, and for loops.
2) The for loop allows initialization of a loop variable, a condition to test each iteration, and an update to the variable between iterations.
3) Loops can be used to repeat code a set number of times or iterate through elements like arrays, and contain break and continue statements to alter control flow.
1) The document discusses different types of loops in Java including while, do-while, and for loops.
2) It provides examples of how to use each type of loop and when each is appropriate.
3) The document also covers loop control structures like break and continue that can alter normal loop execution.
The document discusses various programming concepts in C# such as data types, control flow statements like if/else, switch, loops (for, while, do-while), methods for generating random numbers, and examples of programming problems involving calculations, patterns, and simulating dice rolls. Random numbers can be generated using the Random class, control structures conditionally execute blocks of code, and loops iterate code for a set number of repetitions.
Java allows for platform-independent programming through bytecode compilation. It uses a similar syntax to C++ and object model to Smalltalk. While interpreted, Java code is compiled to bytecode then executed by a Java Virtual Machine. Key Java concepts include primitive data types, variables, operators, conditional and looping statements like if/else, for, and while to control program flow.
Here is a Java program that takes integer input from the user between 0-100 and prints the number in English:
import java.util.Scanner;
public class NumberToWords {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number between 0-100: ");
int num = sc.nextInt();
if(num < 0 || num > 100) {
System.out.println("Number is out of range!");
return;
}
String word = numberToWord(num);
System.out.println(word);
}
public static String numberToWord(int number)
This document provides an overview of the Java programming language. It discusses how Java is platform independent and compiles code to bytecode that runs on the Java Virtual Machine (JVM). Key Java features like automatic memory management, object-oriented design, and security are summarized. The document also covers Java syntax like data types, operators, control flow, and classes/methods. It provides examples of working with files, streams, and serialization in Java.
The document discusses compiler optimizations performed by Java just-in-time (JIT) compilers and the potential for deoptimization. It provides examples of compiler optimizations like reordering, dead code removal, value propagation, and inlining. It also discusses speculative optimizations the JIT compiler can perform like assuming branch behavior or object types. However, deoptimization may occur later if the compiler's assumptions prove incorrect, such as if a new class is loaded that conflicts with earlier class hierarchy analysis. An example program demonstrates deoptimization occurring when a method is compiled without realizing it calls two different classes.
1. The agenda covers warm up activities, presentations on loops in C programming, videos on real-world applications, a game to simulate loops, practical work creating a small program in pairs using CodeBlocks, online self-learning on C programming, and a question and answer session.
2. Students will break into small groups to create a C program related to their capstone project, then discuss using loops in different programs for homework by creating an Office Mix video.
3. Resources include a video explaining for, while, and do-while loops and related reading materials.
1. The agenda covers warm up activities, presentations on loops in C programming, videos on real-world applications, a game to simulate loops, practical work creating a small program in pairs using CodeBlocks, online self-learning on C programming, and a question and answer session.
2. Students will break into small groups to create a C program related to their capstone project, then discuss using loops in different programs for homework by creating an Office Mix video.
3. Resources include a video explaining for, while, and do-while loops and related links for further reading.
The document provides an overview of core Java concepts including try-catch blocks, reading input from the keyboard, control flow statements like if-else and switch, looping with for, while, and do-while loops, arrays, inheritance, overriding, abstract classes, interfaces, and packages. It includes code examples and discusses concepts like exception handling, control flow, looping, arrays, object-oriented programming principles of inheritance and polymorphism.
Java is a platform independent programming language similar to C++ in syntax and Smalltalk in mental paradigm. It has features like automatic type checking, garbage collection, simplified pointers and network access. Java code is compiled to bytecode, which is interpreted by the Java Virtual Machine (JVM) on various platforms, making Java portable across different operating systems and hardware. Methods and data in Java classes can be declared as public or private to control access and eliminate errors between classes.
In this article, I'm going to tell you about my experience of analyzing the Octave project. It is quite a popular one, especially among students who need to scan their math task solutions yet don't feel like buying a Matlab license.
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Generating privacy-protected synthetic data using Secludy and MilvusZilliz
During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
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Similar to bai giang java co ban - java cơ bản - bai 2
To write programs for executing statements repeatedly using a while loop (§4.2).
To develop a program for GuessNumber and SubtractionQuizLoop (§4.2.1).
To follow the loop design strategy to develop loops (§4.2.2).
To develop a program for SubtractionQuizLoop (§4.2.3).
To control a loop with a sentinel value (§4.2.3).
To obtain large input from a file using input redirection rather than typing from the keyboard (§4.2.4).
To write loops using do-while statements (§4.3).
To write loops using for statements (§4.4).
To discover the similarities and differences of three types of loop statements (§4.5).
To write nested loops (§4.6).
To learn the techniques for minimizing numerical errors (§4.7).
To learn loops from a variety of examples (GCD, FutureTuition, MonteCarloSimulation) (§4.8).
To implement program control with break and continue (§4.9).
(GUI) To control a loop with a confirmation dialog (§4.10).
This course provides a strong background about JAVA programming language in the field of computing. The course begins with an introductory overview of the Computer and programs, with distinguishes the terms API, IDE and JDK, and gives a comprehensive knowledge about Java development kits and Java integrative development environments like eclipse and NetBeans. Furthermore, the course prepares student to write, compile, run and develop Java applications which are used to find out the solution for several real life problems, in conjunction with using GUI to obtain input, process and display outputs like message dialog boxes, input dialog boxes, confirmation dialog and so on.
JAVA is a computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.
The aim of this course is to explore Java programming fundamentals related to write, compile, run and develop Java applications that are used to discover the solution for several real life problems.
The official learning outcome for this course is: Upon successful completion of the course the students:
• Must know the basic concepts related JAVA programming language.
• Must know how to write, compile, run and develop java applications.
A combination of lectures and practical sessions will be used in this course in order to achieve the aim of the course.
By MSc. Karwan Mustafa Kareem
This document provides information about an Object Oriented Programming course, including:
1. The lecturer's name, room number, email, and phone number.
2. Prerequisites for the course include having taken an introductory programming course and having a basic understanding of programming concepts.
3. Three recommended textbooks for the course are listed.
The document continues to outline the course syllabus, evaluation, teaching outcomes, learning outcomes, requirements to pass, and various Java programming concepts covered in the course.
The document provides an introduction to a course on Java programming. It outlines the course objectives which are to understand core Java concepts like data types, control flow, methods, arrays, and object-oriented programming. It also describes how to get started with Java programming using Eclipse, including how to create, compile, and run a simple Java application that prints "Welcome to Java!". The document discusses Java characteristics and basic Java concepts like packages, keywords, variables, operators, and control structures like if/else statements.
The document discusses different control structures in C programming. It covers for, while, and do-while loops used for iterative execution. It also covers jump statements like continue, break, and goto that change the flow of execution. The for loop uses an initialization, condition, and increment/decrement. The while loop checks a condition before each iteration. The do-while loop checks the condition after executing the body. Continue skips to the next iteration. Break exits the current loop or switch. Goto jumps to a labeled statement.
The document discusses different types of loops in Java including while, do-while, and for loops. It provides examples of how to use each type of loop and highlights some subtleties. It also covers using break and continue statements to alter loop flow, and provides an example programming exercise to write a program that checks if a string is a palindrome using a for loop.
The document discusses various programming concepts in C# such as random number generation, Boolean expressions, control statements like if/else, switch, for, while and do-while loops. It also covers nested loops, break and continue statements, and provides examples of problems that can be solved using these programming constructs like generating random numbers, printing patterns, and simulating dice rolls.
1) The document discusses different types of loops in Java including while, do-while, and for loops.
2) The for loop allows initialization of a loop variable, a condition to test each iteration, and an update to the variable between iterations.
3) Loops can be used to repeat code a set number of times or iterate through elements like arrays, and contain break and continue statements to alter control flow.
1) The document discusses different types of loops in Java including while, do-while, and for loops.
2) It provides examples of how to use each type of loop and when each is appropriate.
3) The document also covers loop control structures like break and continue that can alter normal loop execution.
The document discusses various programming concepts in C# such as data types, control flow statements like if/else, switch, loops (for, while, do-while), methods for generating random numbers, and examples of programming problems involving calculations, patterns, and simulating dice rolls. Random numbers can be generated using the Random class, control structures conditionally execute blocks of code, and loops iterate code for a set number of repetitions.
Java allows for platform-independent programming through bytecode compilation. It uses a similar syntax to C++ and object model to Smalltalk. While interpreted, Java code is compiled to bytecode then executed by a Java Virtual Machine. Key Java concepts include primitive data types, variables, operators, conditional and looping statements like if/else, for, and while to control program flow.
Here is a Java program that takes integer input from the user between 0-100 and prints the number in English:
import java.util.Scanner;
public class NumberToWords {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number between 0-100: ");
int num = sc.nextInt();
if(num < 0 || num > 100) {
System.out.println("Number is out of range!");
return;
}
String word = numberToWord(num);
System.out.println(word);
}
public static String numberToWord(int number)
This document provides an overview of the Java programming language. It discusses how Java is platform independent and compiles code to bytecode that runs on the Java Virtual Machine (JVM). Key Java features like automatic memory management, object-oriented design, and security are summarized. The document also covers Java syntax like data types, operators, control flow, and classes/methods. It provides examples of working with files, streams, and serialization in Java.
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2. Students will break into small groups to create a C program related to their capstone project, then discuss using loops in different programs for homework by creating an Office Mix video.
3. Resources include a video explaining for, while, and do-while loops and related reading materials.
1. The agenda covers warm up activities, presentations on loops in C programming, videos on real-world applications, a game to simulate loops, practical work creating a small program in pairs using CodeBlocks, online self-learning on C programming, and a question and answer session.
2. Students will break into small groups to create a C program related to their capstone project, then discuss using loops in different programs for homework by creating an Office Mix video.
3. Resources include a video explaining for, while, and do-while loops and related links for further reading.
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In this article, I'm going to tell you about my experience of analyzing the Octave project. It is quite a popular one, especially among students who need to scan their math task solutions yet don't feel like buying a Matlab license.
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Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
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HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/building-and-scaling-ai-applications-with-the-nx-ai-manager-a-presentation-from-network-optix/
Robin van Emden, Senior Director of Data Science at Network Optix, presents the “Building and Scaling AI Applications with the Nx AI Manager,” tutorial at the May 2024 Embedded Vision Summit.
In this presentation, van Emden covers the basics of scaling edge AI solutions using the Nx tool kit. He emphasizes the process of developing AI models and deploying them globally. He also showcases the conversion of AI models and the creation of effective edge AI pipelines, with a focus on pre-processing, model conversion, selecting the appropriate inference engine for the target hardware and post-processing.
van Emden shows how Nx can simplify the developer’s life and facilitate a rapid transition from concept to production-ready applications.He provides valuable insights into developing scalable and efficient edge AI solutions, with a strong focus on practical implementation.
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
GraphRAG for life science domain, where you retriever information from biomedical knowledge graphs using LLMs to increase the accuracy and performance of generated answers
Digital Marketing Trends in 2024 | Guide for Staying AheadWask
https://www.wask.co/ebooks/digital-marketing-trends-in-2024
Feeling lost in the digital marketing whirlwind of 2024? Technology is changing, consumer habits are evolving, and staying ahead of the curve feels like a never-ending pursuit. This e-book is your compass. Dive into actionable insights to handle the complexities of modern marketing. From hyper-personalization to the power of user-generated content, learn how to build long-term relationships with your audience and unlock the secrets to success in the ever-shifting digital landscape.
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?Speck&Tech
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
bai giang java co ban - java cơ bản - bai 2
1. Introduction to
Java Programming
Y. Daniel Liang
Edited by Hoàng Văn Hậu – VTC Academy – THSoft co.,ltd
https://play.google.com/store/apps/developer?id=THSoft+Co.,Ltd
3. Course Objectives
Upon completing the course, you will understand
– Create, compile, and run Java programs
– Primitive data types
– Java control flow
– Methods
– Arrays (for teaching Java in two semesters, this could be the end)
– Object-oriented programming
– Core Java classes (Swing, exception, internationalization,
multithreading, multimedia, I/O, networking, Java
Collections Framework)
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4. Course Objectives, cont.
You will be able to
– Develop programs using Eclipse IDE
– Write simple programs using primitive data
types, control statements, methods, and arrays.
– Create and use methods
– Write interesting projects
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5. Session 02: Control statement
Swith Case statement
While, do while statement
For statement
Continue, break, return
Array in Java
String in Java
Exception and debuging
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6. switch Statements
switch (year) {
case 7: annualInterestRate = 7.25;
break;
case 15: annualInterestRate = 8.50;
break;
case 30: annualInterestRate = 9.0;
break;
default: System.out.println(
"Wrong number of years, enter 7, 15, or 30");
}
Eclipse shortcut key:
S + Ctrl + Space
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7. switch Statement Flow Chart
7 default
numOfYears
15 30
annualInterestRate=7.25 annualInterestRate=8.50 annualInterestRate=9.0 System.out.println("Wrong number of " +
"years, enter 7, 15, or 30");
System.exit(0);
Next
Statement
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8. switch Statement Rules
The switch-expression must yield a value of char, byte, short, or
int type and must always be enclosed in parentheses.
The value1, ..., and valueN must have the same data type as the
value of the switch-expression. The resulting statements in the
case statement are executed when the value in the case
statement matches the value of the switch-expression. (The case
statements are executed in sequential order.)
The keyword break is optional, but it should be used at the end of
each case in order to terminate the remainder of the switch
statement. If the break statement is not present, the next case
statement will be executed.
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9. switch Statement Rules, cont.
The default case, which is optional, can be used to
perform actions when none of the specified cases
is true.
The order of the cases (including the default case)
does not matter. However, it is a good
programming style to follow the logical sequence of
the cases and place the default case at the end.
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10. Actions on Eclipse
Open Eclipse IDE
– Create project: Session2Ex
– Create java class: Ex2WithSwitch.java
Source Run
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11. Repetitions
while Loops
do-while Loops
for Loops
break and continue
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12. while Loop Flow Chart
while (continuation-condition) {
// loop-body;
}
false
Continuation
condition?
true
Statement(s)
Eclipse shortcut key: Next
w + Ctrl + Space Statement
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13. while Loop Flow Chart, cont.
i = 0;
int i = 0;
while (i < 100) { false
(i < 100)
System.out.println(
"Welcome to Java!");
i++;
true
}
System.out.println("Welcoem to Java!");
i++;
Next
Statement
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14. do-while Loop
do { Statement(s)
// Loop body;
true
} while (continue-condition); Continue
condition?
false
Next
Statement
Eclipse shortcut key:
d + Ctrl + Space
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15. for Loops
for (initial-action; loop-continuation-condition;
action-after-each-iteration) {
//loop body;
}
int i = 0;
while (i < 100) {
System.out.println("Welcome to Java! ” + i);
i++;
}
Example:
int i;
for (i = 0; i < 100; i++) {
System.out.println("Welcome to Java! ” + i);
}
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16. for Loop Flow Chart
for (initial-action; Initial-Action
loop-continuation-condition;
action-after-each-iteration) {
//loop body;
}
false
Action-After- Continuation
Each-Iteration condition?
true
Statement(s)
(loop-body)
Next
Eclipse shortcut key: Statement
f + Ctrl + Space
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17. Actions on Eclipse
Open Eclipse IDE
– Create project: Session2Ex
– Create java class: Ex2WithWhile.java
– Change the rule of games.
– Exception input
– Example debug project
Source Run
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18. Arrays
int[] sourceArray = {2, 3, 1, 5, 10};
int[] targetArray = new
int[sourceArray.length];
float[] f = new float[20];
Set data to array:
for (int i = 0; i < sourceArrays.length; i++)
targetArray[i] = sourceArray[i];
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19. Multidimensional Arrays
Declaring Variables of Multidimensional Arrays and
Creating Multidimensional Arrays
int[][] matrix = new int[10][10];
or
int matrix[][] = new int[10][10];
matrix[0][0] = 3;
for (int i=0; i<matrix.length; i++)
for (int j=0; j<matrix[i].length; j++)
{
matrix[i][j] = (int)(Math.random()*1000);
}
double[][] x;
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21. Declaring, Creating, and Initializing Using
Shorthand Notations
You can also use a shorthand notation to declare, create and
initialize a two-dimensional array. For example,
int[][] array = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9},
{10, 11, 12}
};
This is equivalent to the following statements:
int[][] array = new int[4][3];
array[0][0] = 1; array[0][1] = 2; array[0][2] = 3;
array[1][0] = 4; array[1][1] = 5; array[1][2] = 6;
array[2][0] = 7; array[2][1] = 8; array[2][2] = 9;
array[3][0] = 10; array[3][1] = 11; array[3][2] = 12;
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23. Actions on Eclipse
Open Eclipse IDE
– Create project: Session2Ex
– Create java class: Ex2WithArray.java
– Add String type
– Change rule of games
Source Run
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24. Action on Eclipse
Example 2.1
Adding and Multiplying Two Matrices
Objective: Use two-dimensional arrays to
create two matrices, and then add and multiply
the two matrices.
a11 a12 a13 a14 a15 b11 b12 b13 b14 b15 a11 b11 a12 b12 a13 b13 a14 b14 a15 b15
a 21 a 22 a 23 a 24 a 25 b21 b22 b23 b24 b25 a 21 b21 a 22 b22 a 23 b23 a 24 b24 a 25 b25
a 31 a 32 a 33 a 34 a 35 b31 b32 b33 b34 b35 a 31 b31 a 32 b32 a 33 b33 a 34 b34 a 35 b35
a 41 a 42 a 43 a 44 a 45 b41 b42 b43 b44 b45 a 41 b41 a 42 b42 a 43 b43 a 44 b44 a 45 b45
a 51 a 52 a 53 a 54 a 55 b51 b52 b53 b54 b55 a 51 b51 a 52 b52 a 53 b53 a 54 b54 a 55 b55
TestMatrixOperation Run
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25. Example 2.2 (cont) Adding and
Multiplying Two Matrices
a11 a12 a13 a14 a15 b11 b12 b13 b14 b15 c11 c12 c13 c14 c15
a 21 a 22 a 23 a 24 a 25 b21 b22 b23 b24 b25 c 21 c 22 c 23 c 24 c 25
a 31 a 32 a 33 a 34 a 35 b31 b32 b33 b34 b35 c 31 c 32 c 33 c 34 c 35
a 41 a 42 a 43 a 44 a 45 b41 b42 b43 b44 b45 c 41 c 42 c 43 c 44 c 45
a 51 a 52 a 53 a 54 a 55 b51 b52 b53 b54 b55 c 51 c 52 c 53 c 54 c 55
cij = ai1 b1j+ai2 b2j+ai3 b3j+ai4 b4j+ai5 b5j
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26. Action on class
Teacher
– hauc2@yahoo.com
– 0984380003
– https://play.google.com/store/search?q=thsoft+co&c=apps
Captions
Members
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