Introduction to Core Java Programming

Introduction to Core Java
Programming
www.collaborationtech.co.in
Bengaluru INDIA
Presentation By
Ramananda M.S Rao

Introduction to JavaScript Basics
Content
Overview
Get Started
Variables & Declaration
Java Statements
Java Data Types
Control Structures
Keyboard Input
Regular Expressions
Java Exceptions and Logging
Files and Serialization
Java Utility Objects and API’s
Object Oriented Programming
Java Collections
Java Threads
GUI - Awt and Swing
Database Connectivity
Simple Networking
New Features JDK 1.8
Development Tools
About Us

Overview
What is Java?
 Java is a programming language designed for use in the distributed
environment of the Internet.
 Programming language developed for the Web.
 Programming language Developed by James Gosling.
 Sun Microsystems released java in 1995 as a core component of
Sun Java technology.
 Java is very versatile, efficient, platform independent and secure.
 Java is write once and run anywhere.
 About 2 billion Devices using Java in various applications.
 Java is used in Embedded devices, Mobile phones, Enterprise
Servers, Super computers, Web Servers and Enterprise Appls.
 These features makes java technology ideal for network
computing.

Get Started
Java programs
1. Applications 2. Applets.
Application Program :
 Java applications are more general programs written in the Java
language. Java can be used to create all kinds of applications.
Applet Program:
 Applets are Java programs that are downloaded over the World
Wide Web and executed by a java enabled Web browser.
 Applet is an window based program which can be executed inside
another application called a browser.
 Program compiled using javac compiler and converted into an
class file Class file name is then included in the applet tag’s code
attribute in an html file.
 Java Applets makes the application more dynamic and interactive.

Get Started
// html file to show results in browser – FirstHTML.html
<html>
<body>
<applet code="FirstApplet.class" WIDTH=500 HEIGHT=500>
</applet>
</body>
</html>
<applet code=" FirstApplet.class" width=500 height=500></applet>
This tells the browser to load the applet whose compiled code is in
FirstApplet.class (in the same directory as the current HTML
document), and to set the initial size of the applet to 500 pixels wide
and 500 pixels high

Variables, Declaration, & Statements
Java Variables
Primitive Datatypes
Declarations
Variable Names
Numeric Literals
Character Literals
String
String Literals
Arrays
Non-Primitive Datatypes
The Dot Operator
Character Literals:
For characters that cannot be entered directly we use escape sequences.
Description
ddd octal characters ( ddd )
uxxxx hexadecimal characters
’ single quote
” double quote
backslash
r carriage return
n new line
f form feed
t tab
b backspace

Java Data Types
Java Data Types
Java is what is known as a strongly typed language. That means that
Java is a language that will only accept specific values within specific
variables or parameters.
Java (strongly typed)
1: int x; // Declare a variable of type int
2: x = 1; // Legal
3: x = "Test" // Compiler Error
4: x = true; // Compiler Error
There are 9 data types in Java, 8 primitive types and a reference type

Java Data Types
Java Primitive Types
boolean, char, byte, short, int, long, float , double
Reference Types
Basically, anything that is not a primitive (an int, a float, etc.) is a
reference. That means that arrays are references, as are instances of
classes. The variable that you create does not have the object you've
created in it. Rather, it has a reference to that object in it.
1: // Create a new object and store it in a variable
2: MyClass anInstanceOfMyClass = new MyClass();
Objects and Arrays are reference types
Primitive types are stored as values
Reference type variables are stored as references (pointers that we
can’t mess with)

Java Data Types
Passing arguments to methods
Primitive types: the method gets a copy of the value. Changes won’t show
up in the caller
Pass by value
Reference types
The method gets a copy of the reference, the method accesses the same
object
Pass by reference
There is no pass by pointers!
Casting:
Because Java is a strongly typed language, it is sometimes necessary to
perform a cast of a variable. Casting is the explicit or implicit modification of
a variable's type. Casting allows us to view the data within a given variable
as a different type than it was given.
Example:
1: short x = 10; 2: int y = (int)x;

Keyboard Input
// Keyboard Input
import java.util.Scanner;
public class MyScanner {
public static void main(String args[]) {
Scanner ragh = new Scanner(System.in);
System.out.println("Enter the length");
double rlength,rwidth,rarea;
rlength = ragh.nextDouble();
System.out.println("Enter the width");
rwidth = ragh.nextDouble();
rarea= (rlength*rwidth);
System.out.println("Area is ="+rarea);
}
}

Keyboard Input
// Keyboard Input
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class KeyboardBufferedInput {
public static void main (String args[]) throws IOException
{ String s1 =null;
String s2=null;
double a;
System.out.print("enter the length:");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
s1=br.readLine();
double l=Integer.parseInt(s1);
System.out.print("enter the breadth:");
s2= br.readLine();
double w=Integer.parseInt(s2);
a=l*w;
System.out.print("area is="+a);
}
}

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THANK YOU

Introduction to Core Java Programming

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