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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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via Oracle Community by 807595, 1 year ago
java.lang.NumberFormatException: 3.4 at java.lang.Integer.parseInt( at java.lang.Integer.parseInt( at Future$CalcCommand.actionPerformed( at javax.swing.AbstractButton.fireActionPerformed(