How to learn Java quickly?

What is Java?

            ⭆ Java is a objects oriented programming Language. It is Based                      on the c  and c++ programs . Java was developed by James                            Gosling at sun Microsystems and released in 1995.

             ⭆  Java is more powerful because this is platform                                                 independence.

             ⭆  It has great security features , as per oracle website more                              than 3 billion devices are running  on java.

             ⭆  Java runs on a Windows,linux,Sunsolaris, Mac OS and the                              various version of UNIX.

Basics of Java

Object -   Objects should have states and behaviours.

Example: Name of the car is state , running is the behaviour

Class-         It can be defined as a  template and blueprint. It

                         descries the states and behaviours that the object of

                         its type supports.

Method- A method is basically a behaviour.

                         Is a collection of statements that are grouped

                         Together to perform an operation.

Example:

                  To move the car we need set of actions like rotating  steering and pushing the gear , all those actions will grouped under one method 

Instance Variables-

              Each object its Unique.

Basic java program:

              Simple code that will the print the word-(welcome)

Program:-

class HelloCredoSystemz{

    public static void main(String args[]){

      System.out.println("Hello World This HelloCredoSystemz");

   }

}

Features of Java:

    It's Simple and Object Oriented, and Familiar 

    It's Robust and Secure 

   Architecture Neutral and Portable

    Real High Performance 

    Threaded, Interpreted and Dynamic  

 OOPS-

                  Is a methodology  simplify for software development and maintenance by providing some rules.

Platforms Independent-

           A platform is the software or hardware environment.

There are 2 types:

                                                            i.            Software based platforms-It is providing by java. Its run on multiple platforms.

                                                         ii.            Hardware based-That runs on the top of other hardware platforms.

Secured-

                                                                i.            Uses runtime Environment of operating

                                                             ii.            system in c++ application.

                                                         iii.            Uses runtime Environment of its own in java application.

                                                          iv.            No Explicit Pointer.

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