Variables

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About Variables

A variable is a name that has a value. A variable can have different values at different times.

All variables must be declared. When a variable is declared, it is given a type that tells what kind of values it can have. It may also be given an initial value. An int variable can only have an integer value, a String variable can only have a character string as its value, and so on.
We would see following type of variables in Java:

• Local Variables
• Class Variables (Static Variables)
• Instance Variables (Non-static variables)

The variable name called Identifiers

Java Identifiers 

In Java, there are several points to remember about identifiers. They are as follows:

• All identifiers should begin with a letter (A to Z or a to z), currency character ($) or an underscore (_).
• After the first character identifiers can have any combination of characters.
• A key word cannot be used as an identifier.
• Most importantly identifiers are case sensitive.
• Examples of legal identifiers: age, $salary, _value, __1_value
• Examples of illegal identifiers: 123abc, -salary

identifiers using in difference ways