Properties are configuration values managed as key/value pairs. In each pair, the key and value are both String values. The key identifies, and is used to retrieve, the value, much as a variable name is used to retrieve the variable's value. For example, an application capable of downloading files might use a property named "download.lastDirectory" to keep track of the directory used for the last download.
To manage properties, create instances of java.util.Properties. This class provides methods for the following:
loading key/value pairs into a Properties object from a stream,
retrieving a value from its key,
listing the keys and their values,
enumerating over the keys, and
saving the properties to a stream.
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