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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28.Preferences: userNodeForPackage(Class c)
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