Is it possible to override main method?

In Java we can not override a method which is static, but we can implement the method with the same name and parameters. This is called shadowing and not overriding.

Have a Look Here For A better explanation

what is the use of constructor inside abstract class

Instance of Abstract class cant be created but still there are few things that needs to be taken care:

In java, we have two compiler like HotSpot Client and Hotspot server compiler. Why we need two different types of compilers?

The "-client" mode will use the JIT compiler originally developed by Apple -- and it does a straight to native upon the class load. It is great for relatively short lived programs.

Why We declares main method always public ?

Because the rules of the JVM say that when it launches your program, it will look for a public main method in the class you give it.

Try To Predict Output--2

Test Your Java Fundamentals By Predict Its Output.......
Comment If you Like It........ 

class Scratch {

    public static void main( String[] args) {

        Parent p1 = new Parent();

        Parent p2 = new Parent();

        Child c1 = new Child();

        Child c2 = new Child();

Try To Predict Output--1

Guys Test Your Java Fundamentals By Try To Predict Its Output.

Comment Here If You Like It.....

class You{ 
static int i; 
static void method(){ 
System.out.println("Method in You "+i);}} 

More Than One Main Method...Possible ??

Yes, Of-course It Is Possible......
Have a Look At This Piece Of Code......
Please Comment If You Like It.......
******************************************************************CODE 
START********************************************************************* 
//Compile the Program. 
//Execute Class C.