java.lang.NumberFormatException: For input string: "r" /* I typed in 9 - r*/

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Samebug tips

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You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

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Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via Coderanch by Buda young, 1 year ago
For input string: "r" /* I typed in 9 - r*/
via Coderanch by Mike. J. Thompson, 1 year ago
For input string: "r" /* I typed in 9 - r*/
via Coderanch by Buda young, 1 year ago
For input string: "r" /* I typed in 9 - r*/
via Stack Overflow by Biochemist_HK
, 2 years ago
via Netbeans Bugzilla by dovidhalevi, 1 year ago
java.lang.NumberFormatException: For input string: "r" /* I typed in 9 - r*/
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at NFE2.Calculator.main(Calculator.java:19)

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