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Determine if a Preference Node exists in Java
In order to determine the existence a preference node in Java, we use the nodeExists() method. The nodeExists() method returns a boolean value. It returns true when the specified preference node exists in the same tree as this node.
Declaration − The java.util.prefs.Preferences.remove() method is declared as follows −
public abstract boolean nodeExists(String pathname)throws BackingStoreException
where pathname is the path name of the node whose existence needs to be determined.
Let us see a program to determine if a preference node exists in Java −
Example
import java.util.prefs.Preferences;
public class Example {
public static void main(String[] args) throws Exception {
boolean exist = Preferences.userRoot().nodeExists("/node");
System.out.println("Checking node existence before creation: "+exist);
Preferences.userRoot().node("/node");
exist = Preferences.userRoot().nodeExists("/node");
System.out.println("Checking node existence after creation: "+exist);
}
}Output
Checking node existence before creation: false Checking node existence after creation: true Dec 26, 2018 7:12:10 AM java.util.prefs.FileSystemPreferences$1 run INFO: Created user preferences directory.
Updated on: 25-Jun-2020
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