Java Variable types Homework Help

Java Variable types:

A variable is a container it holds the value. The variable must assign with data types. Depends on it holds the memory and value.

Variable declaration and initialization:

Data type variable = value , variable1 = value…

Example:

int x, y; // Declares two ints, x, y.

int x = 100, b = 20; // Example of initialization

float A = 12; // initializes a float type variable A.

char b = 'b'; // the char variable b is initialized with value 'b'

There are three categories of variables available in java.

1. Local variables

2. Instance variables

3. Static variables

Local variables:

It is declared inside method of the class. We cannot access it outside from the class. For the local variable we have to assign the value there is no default value.

Example:

Output:

age of person is : 5

Instance variable:

It is defined without keyword STATIC keyword. It is defined outside method declaration. These variables are created when object created and destroyed when object is destroyed.

Example:

Output:

name : mani

mark : 100.0

Static Variables:

It is declared with keyword STATIC. It is access by class name. It is initialized first only once. It is also known as class variable.

Example:

Output:

Tamil average mark: 75