A scanner is a utility class used for parsing the input text and breaking the input into tokens of various types, such as Boolean, int, float, double, long, and so on. It generates tokens of various types using regular expression-based delimiters. The default delimiter is a whitespace. Using the Scanner API, we can generate tokens of all the primitive types in addition to string tokens.
The String, Pattern, and Matcher classes are able to parse the input and generate tokens of the String type only, but the Scanner class is very useful for checking and generating tokens of different types from the input source. The Scanner instance can be constructed using the File, InputStream, Path, Readable ...
