Sample Code: Preferences

// Our "size" preference can be "small", "medium", or "large"
// Assume user selected "large".
String sizeKey = getClass().getName() + ".size";
properties.setProperty(sizeKey, "large");

Later on, possibly in the next SMC session, get the preference

String sizePreference = properties.getProperty(sizeKey);
if (sizePreference == "large")
    // do something for "large"
else if (sizePreference == "medium")
    ...