Introduction to Java and Applet

1. Introduction to Java and Applet

2. Download Java Compiler (1) SDK

3. Download Java Compiler (2)

4. Download Java SDK (3)

5. Installing Standard- Java 2 SDK

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

7. Set the path to include the directory Test it by typing javac in other directory

8. JDK components • appletviewer.exe applet viewer • java.exe intepreter • javac.exe compiler • javadoc.exe document generator • javap.exe deassembler • jdb.exe debugger

9. A simple Program – javac & java source compile java First output javac first.java

10. Explanation to the first program class comment identifer (name of the class) String args[] (parameter named args) main() must be declared as public access specifier

11. Explanation 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

12. Javadoc - Document Generator javadoc HTML format

13. Javadoc – some example HTML files content of third

14. Javadoc.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.

15. Javap – decompiler

16. Javap - explanation Original source • The javap command disassembles a class file. • Its output depends on the options used. If no options are used, javap prints out the package. Output after javap

17. Jdb – Debugger

18. Jdb - 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

19. Jdb – help