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  1. ,

    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.

  2. ,

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

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java.lang.NumberFormatException: null	at java.lang.Integer.parseInt(Integer.java:382)	at java.lang.Integer.parseInt(Integer.java:463)	at DataReader.main(DataReader.java:32)