Java Important Concept II Static Variable Static Method Static Block II Very Important to Learn

In this session you will learn about what is Static Variable, Static Method, Static Block in detail with examples

Definition/Notes :
Static Variable -
=============================
Same Class - Can be called with out Object Creation, Can be Called directly
Different Class - Can be called with out Object Creation, Class name can be used to call the static variable

Static Method -
=============================
Same Class - Can be called with out Object Creation, Can be Called directly
Different Class - Can be called with out Object Creation, Class name can be used to call the static variable

Static Block
=============================
Same Class - Executed first
Different Class - Executed only if there is any reference ( If no reference , static block is not executed

Keywords : Static

Examples Programs beloow
==========================
Different Classes Example
------------------------------------------------
package staticExamples;

class static_examples
{
static String title="Knowledge Share";

public static void display()
{
System.out.println("Display the Title : " + title);
}

static
{
System.out.println("This is a Static Block");
}

}

public class staticMethodVariableBlock_examples

{
public static void main(String args[])
{
System.out.println("Main Method");


System.out.println("Title is : " + static_examples.title);
//static_examples.display();



/*
* static_examples obj=new static_examples(); String abc=obj.title;
*/
}
}
*********************************************
Same Class Example
-------------------------------------
package staticExamples;

public class static_examples_sameClass

{
static int x=10;
public static void display()
{

System.out.println("x value is : " + x);
}
static
{
System.out.println("this is a static block");
}
public static void main(String args[])
{
// Static block is called first before 19th Statement
System.out.println("main Method");
System.out.println(x);
display();
}
}