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

by

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

See also:

More Related Contents:

  1. java.util.NoSuchElementException – Scanner reading user input
  2. Take a char input from the Scanner
  3. Why am I getting InputMismatchException?
  4. How to read multiple Integer values from a single line of input in Java?
  5. Java using scanner enter key pressed
  6. Scanner input validation in while loop
  7. Scanner is skipping nextLine() after using next() or nextFoo()?
  8. What is a NumberFormatException and how can I fix it?
  9. Close a Scanner linked to System.in
  10. Scanner vs. BufferedReader
  11. How do I use a delimiter with Scanner.useDelimiter in Java?
  12. Scanner error with nextInt() [duplicate]
  13. Read CSV with Scanner()
  14. Scanner doesn’t see after space
  15. Reading in from System.in – Java [duplicate]
  16. Are “while(true)” loops so bad? [closed]
  17. How do I keep a Scanner from throwing exceptions when the wrong type is entered?
  18. Java String Scanner input does not wait for info, moves directly to next statement. How to wait for info? [duplicate]
  19. Close Scanner without closing System.in
  20. How to use multiple Scanner objects on System.in?
  21. Closing BufferedReader and System.in
  22. Read .txt file into 2D Array
  23. How to interrupt java.util.Scanner nextLine call
  24. Java scanner not going through entire file
  25. Filter (search and replace) array of bytes in an InputStream
  26. What does scanner.close() do?
  27. How to force a double input in a TextField in JavaFX?
  28. Scanner is never closed
  29. Does Java recognize infinite loops?
  30. Weird behaviour with Scanner#nextFloat

Leave a Comment