Determining If a Preference Node Exists : Preference Properties « Development Class « Java

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Java » Development Class » Preference Properties

Determining If a Preference Node Exists


   



import java.util.prefs.Preferences;



public class Main {

  public static void main(String[] argv) throws Exception {

    boolean exists = Preferences.userRoot().nodeExists("/yourValue"); // false



    Preferences.userRoot().node("/yourValue");



    exists = Preferences.userRoot().nodeExists("/yourValue"); // true



    Preferences prefs = Preferences.userRoot().node("/yourValue");

    prefs.removeNode();



    // exists = prefs.nodeExists("/yourValue");



    exists = prefs.nodeExists(""); // false

  }

}

Related examples in the same category

1.	Put key value pair to Preference
2.	Get childrenNames from Preferences
3.	Get keys from Preferences
4.	Get name and parent from Preference
5.	Get node from Preference
6.	Get value from Preferences
7.	Export Preferences to XML file
8.	Passing references around
9.	Retrieve the preference node using a Class object and saves and retrieves a preference in the node.
10.	Determining If a Preference Node Contains a Specific Key
11.	Determining If a Preference Node Contains a Specific Value
12.	Removing a Preference from a Preference Node
13.	Getting and Setting Java Type Values in a Preference
14.	Getting the Maximum Size of a Preference Key and Value
15.	Getting the Roots of the Preference Trees
16.	Retrieving a Preference Node
17.	Removing a Preference Node
18.	Retrieving the Parent and Child Nodes of a Preference Node
19.	Exporting the Preferences in a Preference Node
20.	Exporting the Preferences in a Subtree of Preference Nodes
21.	Determining When a Preference Node Is Added or Removed
22.	Read / write data in Windows registry
23.	Listening for Changes to Preference Values in a Preference Node
24.	Saving Data with the Preferences API
25.	INI file
26.	Preference Example:: export To File
27.	Properties load
28.	Properties TreeMap and Stream
29.	Parse Properties Files
30.	Preferences Demo
31.	Properties Test
32.	Sort Properties when saving
33.	Loading configuration parameters from text file based properties
34.	To read a Properties file via an Applet
35.	A Properties file stored in a JAR can be loaded this way
36.	Load a properties file in the startup directory
37.	Have a multi-line value in a properties file
38.	Convert a Properties list into a map.
39.	Listing All System Properties
40.	Getting and Setting Properties
41.	Use XML with Properties
42.	Store properties as XML file
43.	Reading and Writing a Properties File
44.	Read system property as an integer
45.	Read a configuration file using java.util.Properties
46.	Load properties from XML file
47.	Here is an example of the contents of a properties file:
48.	Use the Registry to store informations (Preferences API)
49.	Load a properties file in the classpath
50.	Listing the system properties
51.	Properties Demo
52.	PropsToXML takes a standard Java properties file, and converts it into an XML file
53.	Utility class for preferences
54.	Static methods for retrieving and system properties and converting them to various types
55.	Store recent items (e.g. recent file in a menu or recent search text in a search dialog)
56.	Storing/loading Preferences

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