Load Java program configuration / settings at runtime (key-value pairs)

settings.conf

DEBUG=true
NAME=Yoda
AGE=922

Settings.java

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

// Compile and then run! Change the settings.conf file and rerun without recompiling!
// Settings are updated without needing to recompile.

public class Settings {

  public static boolean DEBUG = false;
  public static String NAME = "";
  public static int AGE = -1;

  public static void main (String[] args) {

    try (FileInputStream fis = new FileInputStream("settings.conf")) {
      Properties props = new Properties();

      // load the settings from the configuration file
      props.load(fis);

      // settings loaded at runtime!
      DEBUG = Boolean.parseBoolean(props.get( "DEBUG" ).toString());
      NAME  =                      props.get( "NAME"  ).toString() ;
      AGE   = Integer.parseInt(    props.get( "AGE"   ).toString());

      if (DEBUG) {
        System.out.println("Settings file successfuly loaded");
        System.out.printf("Name: %s%n", NAME);
        System.out.printf("Age:  %d%n", AGE);
      }

    } catch(IOException e) {
      System.out.println(" !! ERROR: problem reading settings.conf file.");
    }

    return;
  }
  
}