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Alex Rivera
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I have seen two styles for checking whether a variable is a valid integer in Java. One by doing an Integer.parseInt and catching any resulting exception. Another one is by using Pattern. Which of the following is better approach? String countStr; int count; try { count = Integer.parseInt(countStr); } catch (Exception e) { //return as the variable is not a proper integer. return; } or String integerRegex = "([0-9]{0,9})"; if (countStr.isEmpty() || !Pattern.matches(integerRegex, countStr)) { //return as the variable is not a proper integer. return; } My question here is, is doing an Integer.parseInt() and catching an exception for validation a standard way to validate an int ? I admit that my regex is not perfect. But is there any built-in methods available in Java for validation of int? Actually isn't it better to do some validation instead of simply catching the exception?
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