Identifiers are what we use to identify parts of our code, whether this is a class, method or a variable. There are some ground rules on the names we can give to these identifiers, and it is good to understand the ground rules regarding these.

There are 3 levels, or aspects of identifiers, and are summarised as follows

Legal Identifiers – Java has keywords which the compiler uses, and also other rules on what can be used as an identifier, so in order to get your code compiling (and hopefully running too) you’ll need to make sure the names you choose for your variables/classes/methods are legal, more on this below

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