20-12-24
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Q)Why is the return type of main method void?
=>Return type of main method of a Java application is "void". It means
Java application doesn't return anything to the JVM. Infact, should
not return anything to the JVM.
=>JVM is meant for providing infrastructural services(as a PLATFORM)
to the Java application but not meant for receiving any value from the
Java application.
Q)What is the main purpose of a Java application?
   =>data processing
Q)Can data be processed in an application without storing in
Computer's memory?
=>No.
=>Data should be stored in Computer's primary memory/main memory/
RAM(Random Access Memory).

Q)How to store data in RAM in a Java application?
=>by using variables
Q)What is a variable?
=>Named memory location is nothing but a variable.
=>Programmers treat a variable as a container to store data in RAM.
=>data stored in the variable can vary and hence the name.
Note:- In a Java application, variable should be created
(should be declared).
Q)What is meant by declaring a variable?
=>Associating/binding a memory location with a data type is nothing but
declaring a variable.

Q)What is the syntax to declare a variable in a Java application?
<data type>   <identifier>;

For eg.
 int accno;
 float balance;

Q)What is assignment?
=>Assigning a value to a variable i.e. storing a data item
into the variable is nothing but assignment.
 For eg.
           accno=10001;
	   balance=50000;
Q)What is meant by initializing a variable?
=>Assigning a value to a variable for the first time is nothing but
initializing the variable.
For eg.       int a;  //variable declaration
                 a=30; //variable initialization
                 b=40; // assignment