19/12/24
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Q)How to display data on the console(Monitor) in a Java program?
    =>by using two library methods
             1)println()
	     2)print()
Note:- println() method after displaying data, it prints a blank new line.
Where as, print() doesn't

Q)Is mian a library method?
=>No.
=> main is user defined method.

Q)Which performs a task in a Java application?
  =>method(Not only main method. But also other user defined methods).
            For eg.
	      deposit()
	      withdraw()
	      transfterFunds
Q)What is a method?
 =>Named block of code that perfoms a specific task when called is nothing but
 a method.
Q)What are the keywords used in the above program?
     1)class
     2)public
     3)static
     4)void 
Note:- A pre-defined word whose meaning is already explained to the compiler
is nothing but a keyword

Q)What is the user defined class in the above program?
HelloWorld
Q)What are the library classes used in the above program?
   1)String
   2)System
Note:- classes are of two types.
              1)user defined classes
	      2)library classes (API classes)
  =>Java application developer own Java class is known as a user defined class.
  =>Pre-defined classes that come along with JDK's installation are known
  as library classes.

Q)Which is the user defined method in the above program?
=>main method
Q)Which is the library method in the above program?
=>println()
Q)What is the signature of main method?
=>method name and parameters put together form the
singnature of any Java method.

   method signature=method name+parameters

=>main method in a Java class has the following signature.

           main(String [])

Note:- main that takes String array as parameter is nothing but the signature of
main method.
Q)Why is main method declared public?
  =>to fecilitate the JVM to call the main method, it is declared
  public.
                                OR
  =>To give access permission to the JVM to call
  the main method, it is declared public.

 Q)Why is main method declared static?
=>To make the JVM call the main method without the need of 
creating the object, main method is declared static.