package bingo.shared;import java.util.Properties;import java.io.FileInputStream;import java.io.FileOutputStream;public abstract class Parameters {    private boolean DEBUG = false;    private String propertiesFilename;    private String propertiesDescription;    protected Properties properties = null;    protected Parameters(String propertiesFilename, String propertiesDescription) {	this.propertiesFilename = propertiesFilename;	this.propertiesDescription = propertiesDescription;    }    abstract protected void setDefaults(Properties defaults) ;    abstract protected void updatePropertiesFromSettings() ;    abstract protected void updateSettingsFromProperties() ;    protected void getParameters() {        Properties defaults = new Properties();        FileInputStream in = null;	setDefaults(defaults);        properties = new Properties(defaults);	try {	    String folder = System.getProperty("user.home");	    String filesep = System.getProperty("file.separator");            in = new FileInputStream(folder				     + filesep				     + propertiesFilename);	    properties.load(in);	} catch (java.io.FileNotFoundException e) {	    in = null;	    ErrorMessages.error("Can't find properties file. " +				"Using defaults.");	} catch (java.io.IOException e) {	    ErrorMessages.error("Can't read properties file. " +				"Using defaults.");	} finally {	    if (in != null) {		try { in.close(); } catch (java.io.IOException e) { }		in = null;	    }	}	updateSettingsFromProperties();    }    protected void saveParameters() {	updatePropertiesFromSettings();	if (DEBUG) {	    System.out.println("Just set properties: " + propertiesDescription);	    System.out.println(toString());	}        FileOutputStream out = null;	try {	    String folder = System.getProperty("user.home");	    String filesep = System.getProperty("file.separator");            out = new FileOutputStream(folder 				       + filesep				       + propertiesFilename);	    properties.save(out, propertiesDescription);	} catch (java.io.IOException e) {	    ErrorMessages.error("Can't save properties. " +				"Oh well, it's not a big deal.");	} finally {	    if (out != null) {		try { out.close(); } catch (java.io.IOException e) { }		out = null;	    }	}    }}