Determining If a Preference Node Exists : Preference « Development « Java Tutorial

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Java Tutorial » Development » Preference

6. 36. 15. 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

  }

}

6. 36. Preference
	6. 36. 1.	Put key value pair to Preference
	6. 36. 2.	Get childrenNames from Preferences
	6. 36. 3.	Get keys from Preferences
	6. 36. 4.	Get name and parent from Preference
	6. 36. 5.	Get node from Preference
	6. 36. 6.	Get value from Preferences
	6. 36. 7.	Getting and Setting Java Type Values in a Preference
	6. 36. 8.	Getting the Maximum Size of a Preference Key and Value
	6. 36. 9.	Getting the Roots of the Preference Trees
	6. 36. 10.	Removing a Preference from a Preference Node
	6. 36. 11.	Export Preferences to XML file
	6. 36. 12.	Preference save and load
	6. 36. 13.	Preferences Inspector
	6. 36. 14.	Removing a Preference Node
	6. 36. 15.	Determining If a Preference Node Exists
	6. 36. 16.	Determining If a Preference Node Contains a Specific Key
	6. 36. 17.	Determining If a Preference Node Contains a Specific Value
	6. 36. 18.	Read / write data in Windows registry
	6. 36. 19.	Retrieving the Parent and Child Nodes of a Preference Node
	6. 36. 20.	Exporting the Preferences in a Preference Node
	6. 36. 21.	Exporting the Preferences in a Subtree of Preference Nodes
	6. 36. 22.	Listening for Changes to Preference Values in a Preference Node
	6. 36. 23.	Determining When a Preference Node Is Added or Removed
	6. 36. 24.	Get the desired look and feel from a per-user preference

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