Legal Identifiers
■ Identifiers must start with a letter, a currency character ($), or a connecting
character such as the underscore ( _ ). Identifiers cannot start with a number!
■ After the first character, identifiers can contain a
ny combination of letters,
currency characters, connecting characters, or numbers.
■ In practice, there is no limit to the number of characters an identifier can
contain.
■ You can't use a Java keyword as an identifier. Table 1-1 lists all of the Java
keywords including one new one for 5.0, enum.
■ Identifiers in Java are case-sensitive; foo and FOO are two different identifiers.
Complete List of Java Keywords (assert added in 1.4, enum added in 1.5)
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