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leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.

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package lejos.internal.io;

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

public class Settings {
	
	private static Properties props = new Properties();
	private static final String PROPS_FILE = "/home/root/lejos/settings.properties";
	
	static {
		try {
            //load a properties file
			props.load(new FileInputStream(PROPS_FILE));
		} catch (FileNotFoundException e) {
			// Ignore 
	    } catch (IOException e) {
			System.err.println("Failed to load properties file");
		}
	}

	public static void setProperty(String key, String value) {
		props.setProperty(key, value);
		try {
			props.store(new FileOutputStream(PROPS_FILE), null);
		} catch (IOException e) {
			System.err.println("Failed to store properties");
		}	
	}

	public static String getProperty(String key, String defaultValue) {
		return props.getProperty(key, defaultValue);
	}

}