Keyword and identifiers Tutorials

Character Set:

It is a set of symbols which are used to write a Java Program.

Examples:

  A to Z
  a to z
  0 to 9
  Special Symbols ( ) [ ] { } + - & % ….

Keyword: 

it is a reserve word which has some pre-define meanings.

Identifiers or User Define words:

In programming languages, identifiers are used for identification purposes. In Java, an identifier can be a class name, method name, variable name, or label.

Rules of Identifiers or User Defined words:

• Keywords cannot be used as identifiers
• Identifiers must not start with any numeric or it is always recommended to start some of the identifiers with small case.
• It must not contain any special symbol other that (_) or $.
• Identifiers must not contain any blank space in between.