Getting Started with Apache Commons Configuration 1 (1.10)

import java.util.Iterator;
import java.util.List;

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;

public class ApacheCommonsConf_1_10 {

 private static CompositeConfiguration config;

 public ApacheCommonsConf_1_10() {
  config = new CompositeConfiguration();
  try {
   config.addConfiguration(new PropertiesConfiguration("index.properties"));
  } catch (ConfigurationException e) {
   e.printStackTrace();
   System.exit(1001);
  }
 }

 public static void main(String[] args) {

  new ApacheCommonsConf_1_10();

  List<Object> hobbies = config.getList("test.1.hobbies");
  for (Object hobby : hobbies)
   System.out.println(hobby);

  Iterator<String> keys = config.getKeys();
  while (keys.hasNext())
   System.out.println(keys.next());
  
  System.out.println("------------------------------------------------------------------");

  Configuration sub = config.subset("test.1");
  Iterator<String> subKeys = sub.getKeys();
  while (subKeys.hasNext())
   System.out.println(subKeys.next());
 }
}