Introduction to Java and Applet

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Introduction to Introduction to Java and AppletJava and Applet

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Download Java Compiler (1)Download Java Compiler (1)

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Download Java Compiler (2)Download Java Compiler (2)

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Download Java SDK (3)Download Java SDK (3)

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Installing Standard- Installing Standard- Java 2 SDKJava 2 SDK

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Installation - Installation - check whether you check whether you have installed java and javac have installed java and javac

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Set the path to include the directory Set the path to include the directory

Test it by typing javac in other directory

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JDK componentsJDK components• appletviewer.exe applet viewer• java.exe intepreter• javac.exe compiler• javadoc.exe document generator

• javap.exe deassembler• jdb.exe debugger

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A simple ProA simple Program – javac & javagram – javac & java

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Explanation to the first programExplanation to the first program

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Explanation to the first programExplanation to the first program• Class: First is the name of class. It will

generate a First.class after compilation (javac)

• Public: is an access specifier that allows the programmer to control

• Main(): must be declared as public so that it can be accessed.

• String args[]: argv[0] is the first argument• System.out.println: Display the contents

followed by a line feed

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Javadoc - Javadoc - Document GeneratorDocument Generator

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Javadoc – some exampleJavadoc – some example

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Javadoc.exeJavadoc.exe

• Javadoc is a tool shipped with JDK that generates HTML documentation from the comments in the class source files.

• With the aid of Javadoc we can simplify documentation of our code and make it a regular habit.

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Javap – decompilerJavap – decompiler

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Javap - explanationJavap - explanation• The javap

command disassembles a class file.

• Its output depends on the options used. If no options are used, javap prints out the package.

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Jdb – DebuggerJdb – Debugger

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Jdb - explanationJdb - explanation• The Java Debugger, jdb, is a simple

command-line debugger for Java classes.

• It provides inspection and debugging of a local or remote Java Virtual Machine.

• Jdb class format

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Jdb – helpJdb – help