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So the null isn't from the initialization, but from the return value of e.getMessage(), when e doesn't have any error message (for example if there is a NullPointerException thrown). Why is that? Because you're accessing e.getMessage(), but if the message is emtpy e.getMessage() will return null. In Java there are two methods to convert String to Int, they are: Integer.parseInt () Integer.valueOf () Convert String to Int using Integer.parseInt () The Integer.parseInt () is a static method of Integer class used in Java to converts string to primitive integer. String errorMessage = "Some standard error message" we will set the errorMessage to some standard string on initialization and assigned null value clearer in this case, I already tried to pass the id as a string and convert string to int by using Integr. To make the difference between non-initialized value Throw(new Exception("Let's throw some exception message here")) Public static void main (String args) throws So, let's try two cases to debug the behavior: toInt() : Parses the string as an Int number and returns the result and throws NumberFormatException if the string is not a valid representation of a number.

It will goes to Exception block but the errorMessage is null. Im trying parse a string into an int using Integer.parseInt(String a) However Im running into a problem where I get the following error: Exception in thread 'AWT-EventQueue-0' : For input string: '-106.55' Where -106.55 is one of the Strings Im trying to convert to an int. At first, the answer of Moskalev should be right in most ways. There are 3 main ways to convert String to int in Java, first, by using the constructor of Integer class, second, by using parseInt() method of java.lang.