PropertiesExample.java

package com.example;

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

class PropertiesExample {
    protected String pathProperties;
    protected Properties properties;

    public PropertiesExample(String path) {
        pathProperties = path;
        properties = new Properties();

        try {
            FileInputStream stream = new FileInputStream(path);

            properties.load(stream);
            stream.close();
        } catch (FileNotFoundException ex) {
            // log warning
        } catch (IOException ex) {
            // log warning
        }
    }

    protected <T> T getProperty(String key, T fallback) {
        String value = properties.getProperty(key);

        if (value == null) {
            return fallback;
        } else {
            return new T(value);
        }
    }

    protected void setProperty(String key, Object value) {
        properties.setProperty(key, value.toString());

        try {
            FileOutputStream stream = new FileOutputStream(pathProperties, false);

            properties.store(stream, "comment");
            stream.close();
        } catch (FileNotFoundException ex) {
            // log warning
        } catch (IOException ex) {
            // log warning
        }
    }
}