properties demo

readProperties(String file) throws IOException
    {
        InputStream is=new FileInputStream(new File(file));
        Properties properties= new Properties();
        properties.load(is);
        
         for (Enumeration e = properties.keys(); e.hasMoreElements();) {
                String key = ((String)e.nextElement()).trim();
                String value = properties.getProperty(key).trim();
                System.out.println(key+":"+value);
         }
         
         OutputStream fos = new FileOutputStream(file);
         properties.setProperty("name", "1");
         properties.store(fos, "Update 'name' value");
    }