How Can I Prevent `java.lang.NumberFormatException` When Parsing 'N/A' and other Non-Integer Strings in Java?

Preventing java.lang.NumberFormatException for Input String "N/A"

An error known as "java.lang.NumberFormatException" arises when attempting to interpret a non-integer string, such as "N/A," as an integer. To avoid this exception, several approaches can be taken.

1. Exception Handling:

An exception handler can be implemented to catch and handle the exception:

try {
    int i = Integer.parseInt(input);
} catch (NumberFormatException ex) { // handle the exception
    ...
}

2. Integer Pattern Matching:

Alternatively, using regular expressions, you can verify whether the input matches the pattern of an integer:

String input = ...;
String pattern = "-?\d+";
if (input.matches(pattern)) { // any positive or negative integer or not?
    ...
}

By employing either exception handling or integer pattern matching, you can prevent the exception from occurring when parsing input strings that are not integers.

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