Returns the Unicode locale type associated with the specified Unicode locale key for this locale. Returns the empty string for keys that are defined with no type. Returns null if the key is not defined. Keys are case-insensitive. The key must be two alphanumeric characters ([0-9a-zA-Z]), or an IllegalArgumentException is thrown.

Parameters:

key

the Unicode locale key

Returns:  The Unicode locale type associated with the key, or null if the locale does not define the key.

Exceptions:

IllegalArgumentException		if the key is not well-formed
NullPointerException		if key is null

Since:  1.7