27/01/25
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Q)What are the similarities between static variables and instance variables?
    =>Both are data members of a class.
    =>JVM provides defaut values for both of them.
    =>Access modifier can be applied for both of them equally

Q)Explain about static method in Java?
  =>If static modifier is applied to an instance method, it becomes a static method.
   =>A static method can be called on the class.
   =>A static method can be called on the object also once it is available.

Q)What are the rules while implementing a static method?
   =>In a static method, without creating the object, we should not try to access
   non static variables and non static methods.
   =>"this" keyword is not allowed in static method.

Q)What is a static initializer?
=>static block is known as a static initializer.
=>As soon as the class is loaded, static block is executed implicitly.
Q)What is the output of the following piece of code?
   class A{
       static int a;
       static{
           System.out.println("a="+a);
	   a=10;
       }//static block
       static void m(){
           System.out.println("a="+a);
       }
       public static void main(String args[]) {
            System.out.println("static initializer example");
            A.m();
       }
 }
a=0
static initializer example
a=10
Q)What happens in the background as soon as a class(class file) is loaded into memory?
1)memory allocated for static variables.
2)JVM gives default values.
3)JVM executes static blocks
4)JVM calls main method (if any).

Q)What is inheritance?
=>It is one of the object oriented features.
=>Acquiring features from the existing entities is nothing but inhertance.
=>Inhertiance is a mechansim of creating new classes from the existing classes
using is-a relationship.
=>Already existing class is known as a parent class (super class).
=>Newly created class is known as a child class(sub class).
=>parent classes are generalised classes. Where as child classes are
specialised classes.
=>Sub classes inherit properties and behaviour from the parent classes.
=>Inheritance fecilates code reusability.