import java.util.Arrays;
import java.util.Iterator;
import java.util.prefs.Preferences;
public class MainClass {
public static void main(String[] args) throws Exception {
Preferences prefs = Preferences.userNodeForPackage(MainClass.class);
prefs.put("key1", "value1");
prefs.put("key2", "value2");
prefs.putInt("intValue", 4);
prefs.putBoolean("booleanValue", true);
int usageCount = prefs.getInt("intValue", 0);
usageCount++;
prefs.putInt("UsageCount", usageCount);
Iterator it = Arrays.asList(prefs.keys()).iterator();
while (it.hasNext()) {
String key = it.next().toString();
System.out.println(key + ": " + prefs.get(key, null));
}
System.out.println(prefs.getInt("booleanValue", 0));
}
}