java.lang.NumberFormatException: null

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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:542)	at java.lang.Integer.parseInt(Integer.java:615)	at Social.toString(Social.java:46)	at java.lang.String.valueOf(String.java:2994)	at java.io.PrintStream.println(PrintStream.java:821)	at SocialRunner.main(SocialRunner.java:20)