Jul 9, 2009 · Google's Guava library provides a nice helper method to do this: Ints.tryParse.You use it like Integer.parseInt but it returns null rather than throw an Exception if the string does …

Oct 17, 2016 · If you want to check if the string is a valid Java number you can use the method isNumber from the org ...

Jan 8, 2013 · How to check if a String is numeric in Java (41 answers) Closed 8 years ago . I have a gpa program, and it works with the equalsIgnoreCase() method which compares two …

I mean, one should check if the string is a number is a number doing operations ON the String, and not mapping the number retrieval through Exception firing. – csparpa Commented Jun 14, …

Mar 26, 2011 · I downvoted. Reason: The question is to check whether the given string is integer or not. The integer has a limit for number of digits ranging -2147483648 to 2147483647. If you …

Apr 2, 2013 · Java have a String pool under which Java manages the memory allocation for the String objects. See String Pools in Java. When you check (compare) two objects using the == …

If you want to check if the string represents an integer that fits in an int type, I did a little modification to the jonas' answer, so that strings that represent integers bigger than …

In Java for String class there is a method called matches, how to use this method to check if my string is having only digits using regular expression. I tried with below examples, but both of …

Oct 28, 2010 · I'm looking for a function that checks only if it's one of the Latin letters or a decimal number. Since char c = 255 , which in printable version is ├ and considered as a letter by …

Apache Commons Lang provides org.apache.commons.lang.StringUtils.isNumeric(CharSequence cs), which takes as an argument a String and checks if it consists of purely numeric characters …