Web Reference: Because Properties inherits from Hashtable, the put and putAll methods can be applied to a Properties object. Their use is strongly discouraged as they allow the caller to insert entries whose keys or values are not Strings. Jul 23, 2025 · Properties is a subclass of Hashtable. It is used to maintain a list of values in which the key is a string and the value is also a string i.e; it can be used to store and retrieve string type data from the properties file. Properties class can specify other properties list as it's the default. Most Java applications need to use properties at some point, generally to store simple parameters as key-value pairs outside of compiled code. As such, the language has first-class support for properties with java.util.Properties,a utility class designed for handling these types of configuration files. That’s what we’ll focus on in this tutorial.
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