Properties is a subclass of Hashtable . It is used to maintain lists of values in which the key is a String and the value is also a String. The Properties class is used by many other Java classes. For example, it is the type of object returned by System. getProperties( ) when obtaining environmental values.
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A Java field is a variable inside a class . For instance, in a class representing an employee, the Employee class might contain the following fields: name. position. salary.
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