Java™ How To Program (Early Objects), Tenth Edition

2.5.3 Declaring and Creating a Scanner to Obtain User Input from the Keyboard

A variable is a location in the computer’s memory where a value can be stored for use later in a program. All Java variables must be declared with a name and a type before they can be used. A variable’s name enables the program to access the value of the variable in memory. A variable’s name can be any valid identifier—again, a series of characters consisting of letters, digits, underscores (_) and dollar signs ($) that does not begin with a digit and does not contain spaces. A variable’s type specifies what kind of information is stored at that location in memory. Like other statements, declaration statements end with a semicolon (;).

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