How to use .nextInt() and hasNextInt() in a while loop

Question

So I want my program to read an input, which has some integers in one line, for example:

1 1 2

Then it should read every integer separately and print it in a

Answer 1

The hasNextInt call blocks until it has enough information to make the decision of "yes/no".

Press Ctrl+Z on Windows (or Ctrl+D on "unix") to close the standard input stream and trigger an EOF. Alternatively, type in a non-integer and press enter.

Console input is normally line-buffered: enter must be pressed (or EOF triggered) and the entire line will be processed at once.

Examples, where ^Z means Ctrl+Z (or Ctrl+D):

1 2 34 5 6^Z   -- read in 6 integers and end because stream closed
                      -- (two lines are processed: after , after ^Z)
1 2 3 foo 4    -- read in 3 integers and end because non-integer found
                      -- (one line is processed: after )

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See also:

• How do I get Java's hasNextInt() to stop waiting for ints without inputting a character?
• hasNext() - when does it block and why?
• Java Scanner hasNext() doesn't return false