Read / write data in Windows registry : Preference « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Preference

import java.util.prefs.Preferences;

public class Main {
  public static void main(String[] args) {
    String PREF_KEY = "org.username";
    // Write Preferences information to HKCU (HKEY_CURRENT_USER),HKCU\Software\JavaSoft\Prefs\
    Preferences userPref = Preferences.userRoot();
    userPref.put(PREF_KEY, "a");

    System.out.println("Preferences = " + userPref.get(PREF_KEY, PREF_KEY + " was not found."));

    // Write Preferences information to HKLM (HKEY_LOCAL_MACHINE),HKLM\Software\JavaSoft\Prefs\
    Preferences systemPref = Preferences.systemRoot();
    systemPref.put(PREF_KEY, "b");

    System.out.println("Preferences = " + systemPref.get(PREF_KEY, PREF_KEY + " was not found."));
  }
}