Can you list the main characteristics of Properties objects in Java?

Objects of type Properties in Java represent a specialized class for storing key-value pairs, where both the key and value are strings. Main characteristics:

• Inherits from Hashtable<Object,Object>, but is usually used with String.
• Often used for storing configuration parameters.
• Allows loading and saving data in .properties format via load(InputStream) and store(OutputStream, String) methods.
• Supports specifying default values through constructors.
• Does not guarantee the order of elements.

Example usage:

Properties props = new Properties();
props.setProperty("username", "admin");
props.setProperty("password", "12345");

String user = props.getProperty("username");