Object-Oriented Programming Presentation Series 3. introduction to java

1. Introduction to JAVA
Dr. M H B Ariyaratne
https://goo.gl/LGWbU9

2. What is java
Computing platform
Programming Language
APIs

3. History of java
By Sun Microsystems
Initiated in 1991 as OAK
Released in 1995
Oracle acquired Sun Microsystems and took ownership in 2009

4. JVM
● An abstract computing machine that enables a
computer to run a Java program
● Java bytecode can be executed
● platform dependent
● Notations
○ Specification
○ Implementation
○ Instance

5. JRE
Java Runtime Environment
Provide the runtime environment.
An implementation of JVM + set of libraries + other files

6. JDK
● Java Development Kit
● JVM + few other resources such as
○ interpreter/loader
○ a compiler (javac)
○ an archiver (jar)
○ a documentation generator (Javadoc)

7. Java as a Language
● High Level Language
● Object oriented
● Platform Independent - “Write once - run anywhere”
● Simple
● Secure
● Multi-threaded
● Robust

8. Java Editions
Java SE
Java ME
Java EE

9. Tools Needed For Java
● Linux/Windows Operating System
● Java Development Kit
● Text-editor
● Optionally an IDE - Ex. Netbeans

10. Setting up Environment for Java
● Download JDK
● Set Variables
○ JAVA_HOME
○ PATH
○ ClassPath
● Download Java Editor
○ Notepad
○ Netbeans
○ Eclipse

11. Hello World Example
● In Notepad write
public class HelloWorld{
public static void main(String args[]){
System.out.print("Hello World");
}
}

12. Thank you