Java Variables

Variables are used to store the data and we need to follow 2 instructions to store the data.

1] Variable declaration

we are declaring the variable name for the memory block to store the data.

e.g String name, int count

2] Variable initialization

we can initialize the value to a variable.

e.g String name = “Java”, int n = 10

>> Classification of variables

Based on the data types used we have two types.

1] Primitive variable:

if we declare the variables for the primitive data types, then the variable is a primitive variable.

e.g double d, char ch

2] Non-Primitive Variable

If declare the variables for the non-primitive data types, then the variable is non-primitive variable.

e.x String s; // s is a non-primitve variable

Based on the visibility or scope of the variable we have two types

a] Local variables

Declared within a particular method block. It cannot be used outside the block.

b] Global Variables

Declared within the class block but outside the method block this variable can be used anywhere within the class and method.

Rules to be used Local variables :

1] Local variable must be used after its declaration and initialization.

2] Local variables can be reinitialized any number of times.

3] We can not have two or more local variables with the same name.

Note: Whenever we use the variables in the program then the value present within the variables will be used always.

Once we declare a variable we can re-initialize the variables any number of times.

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