Using Windows registry with Java

Needed a way to store (and retrieve) strings on a local host from a Java application. Found some JNI-ways but that didn't feel "pure". Solution was java.util.prefs as in:

import java.util.prefs.*;

public class Main {
 static Preferences prefs;
 
 public static void main(String[] args) {
  
  prefs = Preferences.userRoot();
  String Installed = "";
  String Name = "";
  String def = "NA";
  
  try {
   Installed = prefs.get("Installed", def);
   Name = prefs.get("Name", def);
  } catch(Exception e) {
   e.printStackTrace();
  }
  System.out.println("Installed: " + Installed);
  System.out.println("Name: " + Name);

  if(Installed.equalsIgnoreCase("NA")) {
   prefs.put("Installed", new java.util.Date().toString());
   prefs.put("Name", "jonas testar");
  }
  
  System.out.println("Date: " + new java.util.Date().toString());
 }
}

Quite easy when one know how to do it.

prefs = Preferences.userRoot(); means that we are using HKEY_CURRENT_USER tree in registry. userRoot() can be changed to systemRoot()..