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Chapter 01 Introduction

Chapter 01 Introduction. Course Overview Some Programming ( 程式 ) Languages ( 語言 ) Installation ( 安裝 ) and Use ( 使用 ) of JDK Lectures / Handout Username: Jav@       Password: AQm65. Teaching ( 教學 ) Style ( 風格 ) in this Class ( 課程 ).

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Chapter 01 Introduction

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  1. Chapter 01 Introduction • Course Overview • Some Programming (程式) Languages (語言) • Installation (安裝) and Use (使用) of JDK • Lectures / Handout • Username: Jav@       • Password: AQm65

  2. Teaching (教學) Style (風格) in this Class (課程) • Caveat: English (英文) is my secondary (次要的) language (語言). • Please raise your hand (舉手) ANYTIME if you have any concerns • Motivating examples implemented in Java and demo during the class • Bring your textbook or Codes in the computers • You practice some exercises during the class (if we have time) and at home • Web page: Due date and requirement of homework assignment • Learning (學習) Chinese (中文) along the way 

  3. Introduction • Core (核心) of book • Program clarity (清晰), using both structured (結構化) and object-oriented (物件導向) programming (程式設計) • Big book, cover half, good for future reference • Java • Powerful, object-oriented language • Fun to use for beginners, appropriate for experienced programmers • Language of choice for Internet (網際網路) and network (網路) communications (通訊)

  4. Live-Code Learning • Textbook approach: Use the language to teach the language • Learning by examples is the key to rapid mastery • Practicing Java regularly is essential for success • This book is geared for novice programmers, so the authors stress clarity (清晰) • New concepts highlighted in the text and codes • Line numbers for the code, easier to refer to in the text • Download example programs • www.deitel.com/books/jhtp8 • or Lectures / Handout

  5. Programming Tips • Good Programming Practices • Common Programming Errors (錯誤) • Testing and Debugging Tips • Performance (性能) Tips • Portability Tips • Software (軟體) Engineering (工程) Observations • Look-and-Feel Observations

  6. Two Approaches to Programming 1/2 • (1) Structured programming (結構化程式設計) • An approach to software development whereby a program is defined as a set of logical processes, which may not be carried out sequentially. • By taking the structured approach to programming, developers create software that is efficient in its execution. • Structured programming languages are based on functions (函數), subroutines, or procedures.

  7. Two Approaches to Programming 2/2 • (2) Object-oriented programming (OOP) (物件導向程式設計) • Allows a programmer to think modularly because programs are assembled into components called objects. • Objects: Building blocks of OOP, are reusable, modular components. An object is a self-contained unit containing functions and attributes. • Hardware component • OOP builds on and enhances structured programming

  8. Programming Style • Object-Oriented Programming (chapters 3, 8, 9, 10) • Java classes (類別) and objects (物件) • Program design (設計) • Structured Programming (chapters 4, 5, 6) • Java class methods (方法) • Program implementation (實現) • Disciplined approach to writing programs • Clear, easy to test, debug (移去錯誤), and modify

  9. C and C++ • C: Developed between 1969 and 1973 by Dennis Ritchie at the Bell Laboratories • Evolved from BCPL and B • Most widely used language among professional software developers for commercial applications • Unix • 1969 by a group of AT&T employees at Bell Labs • First in assembly language, recoded in C in 1973 • (Berkeley) BSD, (Sun’s) Solaris, Linux, Android • (object-oriented programming) C++ evolved from C • Developed by (Danish) B. Stroustrup in 1979 at Bell Labs

  10. Java • Java evolved from C++, which evolved from C • Developed in 1991 for intelligent consumer electronic devices by James Gosling of Sun Microsystems • Market did not develop, in danger of being cancelled • Internet exploded in 1993, saved project • Used Java to create web pages with dynamic content • Java formally announced in 1995 by Sun • Now used to create web pages with interactive content, enhance web servers, applications for consumer devices (handheld devices, cell phones)... • Sun: Part of Oracle

  11. Java Products Groups • This book is based on Java Standard (標準) Edition (版本) (Java SE) 6, Update 11 • Develop and deploy Java applications on desktops and servers, as well as in today's demanding embedded environments. • Java Enterprise (企業) Edition (Java EE) • Develop large-scale, distributed networking applications and web-based applications. • Java Micro (微小的) Edition (Java ME) • Develop applications for small, memory-constrained devices, such as cell phones, pagers and PDAs.

  12. 1.10 Java Class Libraries • Java programs • Consist of pieces called classes (類別) • Classes contain methods (方法), which perform tasks • Class libraries • Java API (Applications Programming Interface) • Rich collection of predefined classes which you can use • Have better performance (性能) • Improve program portability • Download the Java API documentationjava.sun.com/javase/downloads/

  13. What’s on the CD-ROM? • What you are required to use: • Java SE Development Kit (JDK) 6 Update 11 (jdk-6u11-windows-i586-p.exe), available on CD-ROM (directory software\Sun) 或上網找最新版 • html/software/install.htm: System Requirements, Running the JDK Installer, Troubleshooting (or Before You Begin in the book) • Other stuff (optional): • Java integrated development environment (IDE): NetBeans, Eclipse • MySQL

  14. Setting (設定) the PATH (路徑) Environment Variable • 設定路徑：Use javac, java, … under any directory • Windows 2000/Vista/Win 7: 開始 > 設定 > 控制台> 系統> 進階> 環境變數> 系統變數 > Path 下加入 c:\Program Files\Java\jdk1.7.0_45\bin; (說明) • 其中的 jdk1.7.0_45 隨您的版本而定

  15. 使用 Java 的步驟 • 打開檔案總管，到達檔案所存放的位置， 按 Shift + 滑鼠右鍵， 選 『在此處開啟命令視窗』 • File extension .java(a text file) • 檔案總管，工具/選項/檢視，隱藏或顯示副檔名 • C:\> javac GravityGame.java • 使用編譯器(compiler) javac 編譯，產生 GravityGame.class • C:\> java GravityGame • 執行 GravityGame.class

  16. Typical Java Development Environment (1/2) • Development steps • (1) Edit (e.g., with Notepad or Emacs) with file extension .java(a text file) • 檔案總管 (file manager)，工具 (tool) / 選項 (option) / 檢視，隱藏 (hide) OR 顯示 (show up) 副檔名 • (2) Compile (with compiler (編譯器) javac) • Produce bytecodes (位元組碼), understood by Java interpreter, as a file *.class that will be interpreted during the execution phase

  17. Typical Java Development Environment (2/2) • Run-time steps • (3) Load: Class loader (application or applet) takes the .class file and transfers it to memory • C:\> java Welcome • (4) Verify: Check that downloaded classes are valid and do not violate Java’s security restriction • (5) Execute (執行): Bytecodes are executed by the Java Virtual Machine (JVM) • Virtual machine: A software application that simulates a computer. Hides the underlying operating system and hardware from the programs that interact with it.

  18. Professional Conduct • 50-minute classes with 10-minute break • Please handle your personal matter during the breaks. • Please do NOT use keyboard or mouse while I am teaching. • Hear sound  my voice   sore throat  • Way of big-room learning: Some feel easy (review) while some feel difficult (catch up) • You are encouraged to discuss with your classmates during practice time. • But you need to write your own code. No plagiarism. • Please bring your class note and homework handout. And MIND. • Method of happy learning • Work hard during the class • More time to play during your free time

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