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Removing a Preference from a Preference Node in Java
In order to remove a preference from a preference node in Java, we use the remove() method. The remove method() removes all the values associated with the specified key in the preference node.
Declaration − The java.util.prefs.Preferences.remove() method is declared as follows −
public abstract void remove (String key)
where key is the key whose preference is to be removed
The remove methods throws the following exceptions −
| NullPointerException | This exception occurs when the key is null |
| IllegalStateException | This exception is thrown when the ancestor node is removed by the removeNode() method. |
Let us see a program to remove the preference from a preference node −
Example
import java.util.prefs.Preferences;
public class Example {
public static void main(String[] args) throws Exception {
// obtains the user preference node for java.lang
Preferences pre = Preferences.userNodeForPackage(String.class);
// Remove a preference in the node
final String name = "name";
pre.remove(name);
}
}Output
Dec 26, 2018 6:00:21 AM java.util.prefs.FileSystemPreferences$1 run INFO: Created user preferences directory.
Updated on: 25-Jun-2020
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