Identifiers

• Identifier: name of a variable, method, or class
• Rules for identifiers in Java:
  • Can be made up of letters, digits, and the underscore (_) character
  • Cannot start with a digit
  • Cannot use other symbols such as ? or %
  • Spaces are not permitted inside identifiers
  • You cannot use reserved words
  • They are case sensitive
• By convention, variable names start with a lowercase letter
• By convention, class names start with an uppercase letter