Question

I’m trying to convert a String to an Integer. I have the following code:

List<String> strings = populateSomeStrings();
List<Integer> ints = new ArrayList<Integer>();

for (int i = 0; i < strings.size(); i++) {
    ints.add(Integer.valueOf(strings.get(i)));
}

When I run it I get an exception saying:

java.lang.NumberFormatException: Invalid int: "1000"

Any ideas why this would be happening? I also tried Integer.parseInt but it does the same thing.

Thanks

Answer 1

There’s obviously something in your strings that isn’t numeric.

Catch the exception and print out the string length and code points for each character, using codePointAt for example.

That should tell you what’s wrong.