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Questionjava Pin
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QuestionRuntime Error showing NumberFormatException: Kindly solve the error Pin
Member 1402130020-Oct-18 3:07
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QuestionRe: Runtime Error showing NumberFormatException: Kindly solve the error Pin
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AnswerRe: Runtime Error showing NumberFormatException: Kindly solve the error Pin
Afzaal Ahmad Zeeshan20-Oct-18 4:29
mveAfzaal Ahmad Zeeshan20-Oct-18 4:29 
This error occurs when you input an argument to a function that has to convert the types of the data, such as in your case, from String to integer. To actually understand the problem do this simple thing, remove the throws Exception from the signature of the methods,
void solve() throws Exception
This will lead you to the function that is most likely to throw the NumberFormatException (which is derived from Exception), and it will lead you to the function call,
int n=Integer.parseInt(b.readLine());
The problem here is that the number that you are trying to input is not a valid number. I would rewrite the code in this way,
try {
   int n = Integer.parseInt(b.readLine());

   // ... further down
} catch (NumberFormatException exception) {
   System.out.println("The input is invalid for this program to continue.");
} catch (Exception error) {
   System.out.println("Unhandled error has occurred, information provided: " + error.getMessage());
}
Remember, there is nothing that you can do to overcome this error, other than politely asking the user to enter the correct format of the number. This exception tells you that the number cannot be converted to that type—Integer. This means, that the number you are trying to input is correct, yet the NumberFormatException happens, the reason is that your number might be bigger than the MAX_VALUE for Integer type. Try using Long.parseLong(), or another type for the data that is overflowing.

Just for thought, read this as well, java - Integer.parseInt number format exception? - Stack Overflow

Number (Java Platform SE 7 )
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QuestionFinalize method in java Pin
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RantJava, Eclipse, Windowbuilder regarding a homemade Desktop App Pin
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