Professional-core-java-training

Welcome
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vibrant technology &
computers
www.vibranttechnologies.co.in1

VibrantTechnology & Computers
Vashi,Navi Mumbai
Introduction to
Java Programming

Introduction
 Java is a programming language and computing platform first released by Sun
Microsystems in 1995. There are lots of applications and websites that will not
work unless you have Java installed, and more are created every day. Java is fast,
secure, and reliable.
 From laptops to datacenters, game consoles to scientific supercomputers, cell
phones to the Internet, Java is everywhere!
 Java allows you to play online games, chat with people around the world,
calculate your mortgage interest, and view images in 3D, just to name a few.
 It's also integral to the intranet applications and other e-business solutions that
are the foundation of corporate computing.

Course Objectives
Upon completing the course, you will understand
Create, compile, and run Java programs
Primitive data types
Java control flow
Methods
Arrays (for teaching Java in two semesters, this could be the end)
Object-oriented programming
Core Java classes (Swing, exception, internationalization,
multithreading, multimedia, I/O, networking, Java Collections
Framework)

Course Objectives, cont.
You will be able to
Develop programs using Forte
Write simple programs using primitive data types, control
statements, methods, and arrays.
Create and use methods
Develop a GUI interface and Java applets
Write interesting projects
Establish a firm foundation on Java concepts

Introduction to Java
What Is Java?
Getting Started With Java Programming
Create, Compile and Running a Java Application

What Is Java?
History
Characteristics of Java

History
James Gosling and Sun Microsystems
Oak
Java, May 20, 1995, Sun World
HotJava
The first Java-enabled Web browser
JDK Evolutions
J2SE, J2ME, and J2EE (not mentioned in the book, but could
discuss here optionally)

Characteristics of Java
 Java is simple
 Java is object-oriented
 Java is distributed
 Java is interpreted
 Java is robust
 Java is secure
 Java is architecture-neutral
 Java is portable
 Java’s performance
 Java is multithreaded
 Java is dynamic

JDK Versions
JDK 1.02 (1995)
JDK 1.1 (1996)
Java 2 SDK v 1.2 (a.k.a JDK 1.2, 1998)
Java 2 SDK v 1.3 (a.k.a JDK 1.3, 2000)
Java 2 SDK v 1.4 (a.k.a JDK 1.4, 2002)

JDK Editions
Java Standard Edition (J2SE)
J2SE can be used to develop client-side standalone
applications or applets.
Java Enterprise Edition (J2EE)
J2EE can be used to develop server-side applications
such as Java servlets and Java ServerPages.
Java Micro Edition (J2ME).
J2ME can be used to develop applications for mobile
devices such as cell phones.
This book uses J2SE to introduce Java
programming.

Java IDE Tools
Forte by Sun MicroSystems
Borland JBuilder
Microsoft Visual J++
WebGain Café
IBM Visual Age for Java

Getting Started with Java
Programming
A Simple Java Application
Compiling Programs
Executing Applications

A Simple Application
Example 1.1
//This application program prints Welcome
//to Java!
package chapter1;
public class Welcome {
public static void main(String[] args) {
System.out.println("Welcome to Java!");
}
}
RunRunSourceSource
NOTE: To run the program,
install slide files on hard
disk.

Creating and Compiling Programs
On command line
javac file.java
Source Code
Create/Modify Source Code
Compile Source Code
i.e. javac Welcome.java
Bytecode
Run Byteode
i.e. java Welcome
Result
If compilation errors
If runtime errors or incorrect result

Executing Applications
On command line
java classname
Java
Interpreter
on Windows
Java
Interpreter
on Sun Solaris
Java
Interpreter
on Linux
Bytecode
...

Example
javac Welcome.java
java Welcome
output:...

Compiling and Running a Program
Where are the files
stored in the
directory?c:example
chapter1 Welcome.class
Welcome.java
chapter2
.
.
.
Java source files and class files for Chapter 2
chapter19 Java source files and class files for Chapter 19
Welcome.java~

Anatomy of a Java Program
Comments
Package
Reserved words
Modifiers
Statements
Blocks
Classes
Methods
The main method

Comments
In Java, comments are
preceded by two slashes (//)
in a line, or enclosed
between /* and */ in one or
multiple lines. When the
compiler sees //, it ignores
all text after // in the
same line. When it sees /*,

Package
The second line in the program
(package chapter1;) specifies a package
name, chapter1, for the class Welcome.
Forte compiles the source code in
Welcome.java, generates
Welcome.class, and stores
Welcome.class in the chapter1 folder.

Reserved Words
Reserved words or keywords are
words that have a specific
meaning to the compiler and
cannot be used for other
purposes in the program. For
example, when the compiler sees
the word class, it understands
that the word after class is the
name for the class. Other
reserved words in Example 1.1
are public, static, and void.
Their use will be introduced

Modifiers
Java uses certain reserved words called
modifiers that specify the properties of the
data, methods, and classes and how they
can be used. Examples of modifiers are
public and static. Other modifiers are
private, final, abstract, and protected. A
public datum, method, or class can be
accessed by other programs. A private
datum or method cannot be accessed by
other programs. Modifiers are discussed in
Chapter 6, "Objects and Classes."

Statements
A statement represents an
action or a sequence of
actions. The statement
System.out.println("Welcome
to Java!") in the program in
Example 1.1 is a statement
to display the greeting
"Welcome to Java!" Every
statement in Java ends with

Blocks
A pair of braces in a program
forms a block that groups
components of a program.
public class Test {
public static void main(String[] args) {
System.out.println("Welcome to Java!");
}
}
Class block
Method block

Classes
The class is the essential Java
construct. A class is a template
or blueprint for objects. To
program in Java, you must
understand classes and be able
to write and use them. The
mystery of the class will
continue to be unveiled
throughout this book. For now,
though, understand that a

Methods
What is System.out.println? It is a method: a
collection of statements that performs a
sequence of operations to display a
message on the console. It can be used
even without fully understanding the
details of how it works. It is used by
invoking a statement with a string
argument. The string argument is enclosed
within parentheses. In this case, the
argument is "Welcome to Java!" You can
call the same println method with a
different argument to print a different
message.

main Method
The main method provides the
control of program flow. The
Java interpreter executes the
application by invoking the main
method.
The main method looks like this:
public static void main(String[]
args) {

Displaying Text in a Message
Dialog Box
you can use the showMessageDialog method
in the JOptionPane class. JOptionPane is
one of the many predefined classes in the
Java system, which can be reused rather
than “reinventing the wheel.”
RunRunSourceSource

The showMessageDialog Method
JOptionPane.showMessageDialog(null, "Welcome to
Java!",
"Example 1.2",
JOptionPane.INFORMATION_MESSAGE));

The exit Method
Use Exit to terminate the program and stop all
threads.
NOTE: When your program starts, a thread is
spawned to run the program. When the
showMessageDialog is invoked, a separate thread
is spawned to run this method. The thread is not
terminated even you close the dialog box. To
terminate the thread, you have to invoke the exit
method.

Thank You…

Professional-core-java-training

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