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ICT 6007 Visual and Internet Programming using JAVA

ICT 6007 Visual and Internet Programming using JAVA. Mohammad Tanvir Alam Lecturer IICT,BUET Home page: http://teacher.buet.ac.bd/teacher/mtanviralam/. Administrative. Contact mtanviralam@iict.buet.ac.bd mtanvir96@yahoo.com Course Group www.groups.yahoo.com/group/ict6007 Course handout

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ICT 6007 Visual and Internet Programming using JAVA

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  1. ICT 6007 Visual and Internet Programming using JAVA Mohammad Tanvir Alam Lecturer IICT,BUET Home page: http://teacher.buet.ac.bd/teacher/mtanviralam/

  2. Administrative • Contact • mtanviralam@iict.buet.ac.bd • mtanvir96@yahoo.com • Course Group • www.groups.yahoo.com/group/ict6007 • Course handout • www.groups.yahoo.com/group/ict6007 Or • http://teacher.buet.ac.bd/teacher/mtanviralam/ • Please join the group to get lecture materials and participate in group discussion • Feel free to e-mail me anytime

  3. Reference Book • Java How to Program (5th or 6th edition) Deitel & Deitel • Programming Tools • Java 2 Standard Edition • IDE • JBuilder 7.0 or later • Kawa 4.0 or later

  4. Chapter 1 Outline History of C++ History of Java Java Class LibrariesBASIC, Visual Basic, Visual C++, C# and .NET Basics of a Typical Java Environment Thinking about Objects

  5. Machine Languages, Assembly Languages and High-Level Languages • Machine language • “Natural language” of computer component • Machine dependent • Assembly language • English-like abbreviations represent computer operations • Translator programs convert to machine language • High-level language • Allows for writing more “English-like” instructions • Contains commonly used mathematical operations

  6. Compiler VS Interpreter • Compiler • Compiler convert to whole program to machine language • Interpreter • Execute high-level language programs without compilation line by line

  7. History of C++ • C++ • Evolved from C • Provides object-oriented programming capabilities • Objects • Reusable software components that model real-world items

  8. History of Java • Java • Originally for intelligent consumer-electronic devices • Then used for creating Web pages with dynamic content • Now also used for: • Develop large-scale enterprise applications • Enhance WWW server functionality • Provide applications for consumer devices (cell phones, etc.)

  9. Java Class Libraries • Classes • Include methods that perform tasks • Used to build Java programs • Java contains class libraries • Known as Java APIs (Application Programming Interfaces)

  10. BASIC, Visual Basic, Visual C++, C# and .NET • BASIC • Beginner’s All-Purpose Symbolic Instruction Code • Visual Basic .NET • Framework Class Library (FLC) • Visual C++ • Microsoft Foundation Classes (MFC) • C# • C-Sharp • .NET • .NET platform

  11. Basics of a Typical Java Environment • Java programs normally undergo five phases • Edit • Programmer writes program (and stores program on disk) • Compile • Compiler creates bytecodes from program • Load • Class loader stores bytecodes in memory • Verify • Verifier ensures bytecodes do not violate security requirements • Execute • Interpreter translates bytecodes into machine language

  12. Primary Memory Primary Memory Primary Memory Program is created in an editor and stored on disk in a file ending with .java. Editor Phase 1 Disk Compiler creates bytecodes and stores them on disk in a file ending with .class. Compiler Phase 2 Disk Class Loader Phase 3 Class loader reads .class files containing bytecodes from disk and puts those bytecodes in memory. Disk Bytecode Verifier Phase 4 Bytecode verifier confirms that all bytecodes are valid and do not violate Java’s security restrictions. Interpreter reads bytecodes and translates them into a language that the computer can understand, possibly storing data values as the program executes. Interpreter Phase 5 . . . . . . . . . . . . . . . . . . Fig. 1.1 Typical Java environment.

  13. Thinking About Objects (cont.) • Objects • Reusable software components that model real-world items • Look all around you • People, animals, plants, cars, etc. • Attributes • Size, shape, color, weight, etc. • Behaviors • Babies cry, crawl, sleep, etc.

  14. Thinking About Objects (cont.) • Object-oriented design (OOD) • Models real-world objects • Models communication among objects • Encapsulates attributes and operations (behaviors) • Information hiding • Communication through well-defined interfaces • Object-oriented language • Programming in object oriented languages is called object-oriented programming (OOP) • Java

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