1. 1 1 1 Introduction to Java

2. 2 History of Java Java – Originally for intelligent consumer-electronic devices – Then used for creating Web pages with dynamic content – Now also used to: Develop large-scale enterprise applications Enhance WWW server functionality Provide applications for consumer devices (cell phones, etc.)

3. 3 Java Class Libraries Classes – Include methods that perform tasks Return information after task completion – Used to build Java programs Java provides class libraries – Known as Java APIs (Application Programming Interfaces)

4. 4 FORTRAN, COBOL, Pascal and Ada FORTRAN – FORmula TRANslator COBOL – COmmon Business Oriented Language Pascal – Structured programming Ada – Multitasking

5. 5 BASIC, Visual Basic, Visual C++, C# and.NET BASIC – Beginner’s All-Purpose Symbolic Instruction Code.NET –.NET platform Visual Basic.NET – Based on BASIC Visual C++ – Based on C++ C# – Based on C++ and Java

6. 6 Typical Java Development 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 Bytecode Verifier confirms bytecodes do not violate security restrictions – Execute JVM translates bytecodes into machine language

7. 7 Fig. 1.1 Typical Java development environment.

8. 8 Creating a Program with JCreator Click on the JCreator Icon IDE window appears

9. 9 Creating a Program with JCreator Click on File, New, then Project Project Wizard appears – Choose Java Application template

10. 10 Creating a Program with JCreator Give the project a name Then click Next

11. 11 Creating a Program with JCreator You will want the JDK version 1.5 This tab is where you can specify hsa library At this point you can click on Finish

12. 12 Creating a Program with JCreator Now we create our class (the program) with File, New, and Class The Class Wizard appears. Specify a name for the class and make sure Public is chosen For now, you can proceed with Finish

13. 13 Creating a Program with JCreator The wizard creates a template. Now complete the program with the required commands.

14. 14 Creating a Program with JCreator Run the compiler with Build, and CompileFile Build Output shows in bottom pane. This is where compiler error messages will be displayed.

15. 15 Creating a Program with JCreator To run the compiled program click on Build, and ExecuteFile Program runs in separate window Without Creating a Project

16. 16 View Flash Presentations Creating a workspace, project, and applicationCreating a workspace, project, and application Writing, compiling, running an application

17. 17 1 1 Introduction to Java