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The Java Developers Almanac 1.4Order this book from Amazon. |
e406. Determining If a Preference Node Contains a Specific KeyYou cannot savenull as a preference value. Therefore, if you
retrieve a value using a default value of null , and null is
returned, you can assume that the key is not present.
// Returns true if node contains the specified key; false otherwise. public static boolean contains(Preferences node, String key) { return node.get(key, null) != null; }
e407. Determining If a Preference Node Contains a Specific Value e408. Removing a Preference from a Preference Node e409. Getting and Setting Java Type Values in a Preference e410. Getting the Maximum Size of a Preference Key and Value
© 2002 Addison-Wesley. |