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Explain data input technique in a program using the Scanner class.

Input in Java

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Answer

The data entered by the user through the keyboard is provided to our Java program with the help of standard input stream that is specified as System.in in the program. We connect our Scanner class to this stream while creating its object. The input received by Scanner class is broken into tokens using a delimiter pattern. The default delimiter is whitespace. Scanner class provides various next methods to read these tokens from the stream. The different next methods provided by Scanner class are next(), nextShort(), nextInt(), nextLong(), nextFloat(), nextDouble(), nextLine(), next().charAt(0).

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