Notes

262
Core Java : Lecture 1
Java

Java is High level language.

First it was named as Oak in 1991 , but later changed to java in 1995.James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The language was initially called Oak after an oak tree that stood outside Gosling's office , it went by the name Green later, and was later renamed Java, from Java coffee, said to be consumed in large quantities by the language's creators.

Principles

There were five primary goals in the creation of the Java language: It must be "simple, object-oriented, and familiar". It must be "robust and secure". It must be "architecture-neutral and portable". It must execute with "high performance". It must be "interpreted, threaded, and dynamic".

What is java?

Java is a programming language and a platform.

Java is a high level, robust, secured and object-oriented programming language.

Platform: Any hardware or software environment in which a program runs, is known as a platform. Since Java has its own runtime environment (JRE) and API, it is called platform.

Features

Simple Object-Oriented Platform independent Secured Robust Architecture neutral Portable Dynamic Interpreted High Performance Multithreaded Distributed

What is Object Oriented Programming

Object-oriented programming (OOP) is a programming language model organized around objects rather than "actions" and data rather than logic.Java is a modular programing i.e the problem is divided into small small modules

Requirements

For executing any java program, you need to install the JDK if you don't have installed it, download the JDK and install it. set path of the jdk/bin directory. create the java program compile and run the java program

How to set path

To set the temporary path of JDK, you need to follow following steps:

Open command prompt copy the path of jdk/bin directory write in command prompt: set path=copied_path For Example:

set path=C:\Program Files\Java\jdk1.6.0_23\bin

Basic program

open Notepad write this program...

class Simple{
public static void main(String args[]){
System.out.println("Hello Java");
}
}

save this file as Simple.java

now open command prompt first Setpath as mentioned above now To compile: write javac Simple.java To execute: write java Simple

Output:Hello Java

In next Lecture : Lecture 2

  1. Explanation of the above code
  2. classes
  3. object
  4. variables
  5. Basic program

Thank you

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