To avoid the confusion, you can create a new 'reply' variable for each 'type' of data, as shown in the example below. Trying to scan for a String after scanning for a numeric response is the most troublesome. The problem is that the newline character of the input may be left on the line to be picked up as input on the next scan for user input. Once the stream (System.in) gets closed in a program, you will not be able to re-open it in that program.Ĭonfusion arises when utilizing the Scanner class with a mixture of numeric data types (int, double) with the String data type.

If you close after your first use of the first data type, the underlying stream (System.in) will get closed and your future attempts to receive input of other data types will fail (actually, you will get an error). If you have multiple inputs from the user of data types involving numerics (int, double) and strings (String), be sure to close the scanner at the END of the program. To avoid an issue called 'resource leak' in Eclipse, close the access to the Scanner class before ending your program. To get around this problem, you can use the next( ) in combination with charAt(0) to accept a single character.Ĭhar initial = reply. There is no specific command in the Scanner class for accepting characters. If the user's response will be char (a single character):

How to use eclipse scanner input