What's the best way to check if a String represents an integer in Java?

Question

I normally use the following idiom to check if a String can be converted to an integer.

public boolean isInteger( String input ) {
    try {
        Integer.         


        

Answer 1

What you did works, but you probably shouldn't always check that way. Throwing exceptions should be reserved for "exceptional" situations (maybe that fits in your case, though), and are very costly in terms of performance.