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IT1202-Fundamentals Of Programming(Using JAVA)

Interacting with Java ProgramsVersion 1.0

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Introduction to Java Development Kit (JDK)

JDK provides core set of tools that are necessary to develop Professional Java applications

These tools are discussed in detail later

JDK tools are also written in Java.

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Introduction…………

JDK is a set of command-line programs, text-based utilities that don’t make use of a graphical user interface.

Programmers run each of the JDK’s utilities by typing java GetFunky.class

This command tells the java program – the bytecode interpreter – to run a bytecode

file called GetFunky.class (As you see later today, compiled Java programs all have

the .class file extension)

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Introduction…………

Windows 95 users must use the MS-DOS prompt command to open a window where commands can be typed.

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Introduction……….

Installing the Java Development Kit

JDK for different platforms available

in a CD or can download from the

web site: http://java.sun.com

Windows InstallationBefore installing the JDK on your system

make sure that no other Java development

tools are installed.

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Installation……….To install the JDK on Windows, double-click the installation archive file or use the Start Run command from the Windows taskbar to find and run the file.

After you see a dialog box asking whether you want to install JDK the JDK Setup Wizard is displayed. You can use this window to configure how the JDK is installed in your system.

The default settings for this wizard should be fine for most users. The JDK is installed in a new folder with a name based on the version you’re downloading

(such as \jdk1.2), unless you use the Browse button to select a different folder on your system.

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Installation………

The wizard will install the following JDK components:

Program files

Native Interface header files

Tooldocs

Demo files

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Installation……….

Solaris Installation

Sun’s Solaris version of the JDK can be installed on the following platforms:

SPARC systems running Solaris 2.4 or higher

x86 systems running Solaris 2.5 or higher

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Creating a source file

Java applications are standalone Java programs that do not require a Web browser to run.

Run them locally with your mouse or

by typing the program name at a command line.

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Creating a source file

Any plain text editor or text editor capable of saving in ASCII format can be used to create a Source file

Examples are DOS EDIT, Notepad etc.

Source File should be saved with a .java extension

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Creating……….

If you are using Windows 95, 98 or NT, a text editor such as Notepad may add an extra .txt file extension to the filename of any Java source files you save.

The Java compiler will only handle source files with the .java file extension.

To avoid this problem place quotation

marks around the filename when you

are saving a source file.

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Creating……….

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Creating………….Writing the program

Choose the editor according to your choice & enter the Java program.

class HelloDan { public static void main (String[] arguments) { System.out.println (“What’s your name?”); } }

» After finish typing the program, save the file somewhere on your drive with the name HelloDan.java.

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Compiling & running the source file

Compile the Source FileFirst set the Java Environment

Setting The PathIn your Autoexec.bat file set the PATH and CLASS PATH as followsPATH …………;\C:\JDK1.3\BIN\…. Indicates any existing paths

SET CLASSPATH =C:\JDK1.3\lib\classes.zip;.;

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Compiling………….

Compiling and Running the Source File contd..Assuming you saved your source file in myJavaPrg Directory

C:\myJavaPrg>Javac Test.java

Java Compiler

Source File Name (ensure to use Same name as the class Name)

Java Compilerwill create aJava byte code file

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Running Java Programs

To execute byte code file

C:\myJavaPrg>Java Test

Java Interpreter

Class Name

Java Byte Code InterpreterExecute the Java Byte codeclass file

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Java byte code fileBytecode is the Java virtual machine’s version of the machine code, the instructions it directly understands.

The virtual machine known as Java interpreter or Java runtime.

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Java……….

The virtual machine takes compiled Java programs & converts their instructions into commands, which known as byte code, can run on any platform & operating system that has a Java virtual machine.

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Java byte code interpreter

Java codeJava code

Java Compiler Java Bytecode (Platform Independent)

Java Interpreter (Pentium)

Java Interpreter

(PowerPC)

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Java byte code Interpreter…..

Source code, is the set of programming statements a programmer enters into a text editor when creating a program.

Source code is compiled into bytecode so that it can be run by a Java virtual machine.

The capability of a single bytecode file to run across

platforms is crucial to what makes Java work on the

World Wide Web, because the Web itself is

platform-independent.