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In Java we declare a variable by placing the type first, fallowed by the name of the variable. Semicolon at the end of each declaration is necessary.

Rules for a variable name:

A variable name must begin with a letter, and must be a sequence of letters or digits.

A letter is defined as 'A'–'Z', 'a'–'z', '_', or any Unicode character that denotes a letter .

Digits are '0'–'9' and any Unicode characters that denote a digit.

Symbols like '+' or '©' cannot be used inside variable names, nor can spaces.

All characters in the name of a variable are significant and case is also significant. The length of a variable name is essentially unlimited.

Examples:

Int days;

Double salary;

Long population;

Char name;