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Chapter 1

Introduction to Java

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History of Java

• Java• Originally for _________________________ devices• Then used for creating Web pages with

__________________________• Now also used to:

• Develop large-scale ___________ applications

• Enhance WWW server functionality

• Provide applications for consumer devices (cell phones, etc.)

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Java Class Libraries

• Classes• Include methods that ___________________• Return _______________ after task completion• Used to build Java programs

• Java provides class libraries• Known as Java APIs _____________________

_________________ _________________

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FORTRAN, COBOL, Pascal and Ada

• FORTRAN• FORmula __________________

• COBOL• COmmon _______________ Oriented Language

• Pascal• Structured programming

• ____________• Multitasking

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BASIC, Visual Basic, Visual C++, C# and .NET

• BASIC• Beginner’s _____________ Symbolic Instruction

_______________

• .NET• .NET platform

• ______________ Basic .NET• Based on BASIC

• Visual C++• Based on C++

• C#• Based on _____________________

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Typical Java Development Environment

• Java programs normally undergo five phases• ________________

• Programmer writes program (and stores program on disk)

• Compile• Compiler creates _______________ from program

• Load• Class loader stores bytecodes in memory

• Verify• Bytecode Verifier confirms bytecodes do not

violate _______________________________• Execute

• JVM translates bytecodes into ____________________

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Fig. 1.1 Typical Java development environment.

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Creating a Program with JCreator

• Click on the JCreator Icon

• IDE windowappears

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Creating a Program with JCreator

• Click on File, New, then Project

• Project Wizard appears• Choose Java Application template

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Creating a Program with JCreator

• Give the project a ____________

• Then click Next

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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 FinishAt this point you can click on Finish

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Creating a Program with JCreator

• Now we create our class (the program) with File, New, and Class

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Creating a Program with JCreator

• The wizard creates a template.

• Now complete the program with the required commands.

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Creating a Program with JCreator

• Run the compiler with Build, and CompileFile

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Creating a Program with JCreator

• To run the compiled program click on Build, and ExecuteFile

• Program runs in separate window

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Programming with "Ready to Program"

• Find the "Ready" option on the program menu or click on the"Ready" icon

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Programming with "Ready to Program"

• An empty editor window appears

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Java Programs

• A Java program consists of one or more classes

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Creating a Java Application

• The "Ready" environment will give you skeleton or boilerplate format for programs

• Click on File, New, and HSA Console option

• A dialog box asksfor the name of the class

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Creating a Java Application

• The appropriate boilerplate text appears in the edit window – note the color coding

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Creating a Java Application

• Fill in the necessary commands

• Save theprogram

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Creating a Java Application

• To run a Java program• Press the Run button or• Press Ctrl+R or• Press F1

• The consoleprogram showsa consolewindow

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Creating a Java Application

• Make sure to save the program before quitting

• The "Ready" environment will remind you

• To exit the "Ready" environment• Click the X close or• Choose File, Exit or• Use Ctrl-Q

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Creating a Java Application

• Errors in the program• Syntax errors are found for you by the compiler

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Why Different IDEs?

• Which one you use depends on what you are doing

• In class the Ready to Program IDE is __________________, “quick and dirty”

• But … it does not support JDK 5.0

• ____________________• supports JDK 5.0

• Eclipse• a bit more complicated, but does a bit more• found to be a bit balky with some elements of JDK

5.0