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class 29 :-
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Properties
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The Properties class in Java is a subclass of Hashtable that is specifically designed to handle key-value pairs where both keys and values are strings. It is part of the java.util package.

Key Points:
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Keys and values are stored as String.
Main Purpose:
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To read, write, and manage configuration data.
Commonly used to load settings from .properties files.

Uses of Properties Class:
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Configuration Management
Storing application settings like database URL, username, password, etc.

Example: config.properties
Reading from .properties files
load() method reads key-value pairs from a file.
Writing to .properties files
store() method saves key-value pairs to a file.

Environment Settings
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Can hold system properties (via System.getProperties()).
Internationalization (i18n)
Used to store localized messages for different languages.

Common Methods:
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load(InputStream inStream) – Reads properties from a file.
store(OutputStream out, String comments) – Writes properties to a file.
getProperty(String key) – Retrieves a property value.
setProperty(String key, String value) – Adds or updates a property.
list(PrintStream out) – Prints all properties.