Preferences: nodeExists(String pathName) : Preferences « java.util.prefs « Java by API

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Java by API » java.util.prefs » Preferences

Preferences: nodeExists(String pathName)


 



import java.util.prefs.Preferences;



public class Main {

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

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

    if (!exists) {

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

      prefs.removeNode();

      // prefs.removeNode();

    }

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

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

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



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



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

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

  }

}

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4.	Preferences: addPreferenceChangeListener(PreferenceChangeListener pcl)
5.	Preferences: exportNode(OutputStream os)
6.	Preferences: exportSubtree(OutputStream os)
7.	Preferences: get(String key, String def)
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10.	Preferences: getDouble(String key, double def)
11.	Preferences: getFloat(String key, float def)
12.	Preferences: getInt(String key, int def)
13.	Preferences: getLong(String key, long def)
14.	Preferences: importPreferences(InputStream is)
15.	Preferences: keys()
16.	Preferences: name()
17.	Preferences: node(String pathName)
18.	Preferences: parent()
19.	Preferences: put(String key, String value)
20.	Preferences: putBoolean(String key, boolean value)
21.	Preferences: putByteArray(String key, byte[] value)
22.	Preferences: putDouble(String key, double value)
23.	Preferences: putFloat(String key, float value)
24.	Preferences: putLong(String key, long value)
25.	Preferences: remove(String key)
26.	Preferences: removeNode()
27.	Preferences: systemRoot()
28.	Preferences: userNodeForPackage(Class c)
29.	Preferences: userRoot()

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