The Scanner class is a utility class in Java that is used to read user input or process simple regex-based parsing of file or string source. It is found in the java.util package and is used to obtain the input of primitive types like int, double, etc., and strings. The Scanner class is used to create bi-directional communication between the software and its user, providing a way for the user to enter information that the software can use to inform its behavior.

To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation. The most commonly used method is nextLine(), which is used to read Strings. There are also other methods to read other types of input, such as nextBoolean(), nextByte(), nextDouble(), nextFloat(), nextInt(), nextLong(), and nextShort() .

The Scanner class is mostly used to receive user input and parse them into primitive data types such as int, double, or default String. It can also be used to parse data using regular expressions by generating tokens. The Scanner class comes with several methods to create more robust input collection techniques.

To create an object of the Scanner class, we usually pass the predefined object System.in, which represents the standard input stream. We may pass an object of class File if we want to read input from a file.

In summary, the Scanner class is a useful utility class in Java that is used to read user input or process simple regex-based parsing of file or string source. It is found in the java.util package and is used to obtain the input of primitive types like int, double, etc., and strings. The Scanner class is mostly used to receive user input and parse them into primitive data types such as int, double, or default String.