How to Use the Java Preferences API

1) Create the preferences.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE preferences SYSTEM "http://java.sun.com/dtd/preferences.dtd">
<preferences>
  <root type="system">
    <map/>
    <node name="Sample">
      <map>
        <entry key="message" value=""/>
      </map>
    </node>
  </root>
</preferences>

2) Import the preferences.

3) Create the PreferencesSample.java file:

import java.util.prefs.Preferences;

import static java.lang.System.out;

public final class PreferencesSample {

  public static void main(final String[] args) {
    final Preferences prefs = Preferences.systemRoot().node("Sample");

    out.println(prefs.get("message", null));
  }

}

4) Compile the PreferencesSample.java file.

5) Launch the PreferencesSample class.

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