Types of Variables in Java

Types of Variables:

There are various variables on the basis of scope in Java. They are:

1.       Class Variables;

2.       Instance Variables;

3.       Local Variables;

4.       Static Variables;

5.       Automatic Variables;

Class Variables:

-          These are accessible with in a class and its object.

-          These must be declared inside the class before they are used.

Instance Variables:

-          These are declared inside a class and are created when the class is instantiated.

-          Object gives different values to these instance variables.

Local Variables:

-          They are declared inside the methods.

-          Their scope is within the block of code in which they are defined.

-          They can’t be accessed outside the code.

Static Variables:

-          These variables have memory allocated only once, but they are globally accessed through all instances of the class.

-          Even if the instance is destroyed, these variables are not destroyed.

Automatic Variables:

-          These are accessible within the function in which they are declared.

-          The automatic variables are created when a function is called and are destroyed when we exit the function.

       For allocation of memory, we use new.

       For DE allocation of memory, we use Garbage Collector.