Exceptions: NumberFormatException.getMessage names the exact string that failed to parse

Integer.parseInt and similar methods throw NumberFormatException whose message quotes the offending input verbatim, which is far more useful for debugging than a generic parse failure would be.

Code

String[] inputs = {"42", "12x", "", "  7"};
for (String input : inputs) {
    try {
        System.out.println("Parsed \"" + input + "\" -> " + Integer.parseInt(input));
    } catch (NumberFormatException e) {
        System.out.println("Failed on \"" + input + "\": " + e.getMessage());
    }
}

Output

Parsed "42" -> 42
Failed on "12x": For input string: "12x"
Failed on "": For input string: ""
Failed on "  7": For input string: "  7"