javaLogic errorEasy

Regex split on literal dot splits every character

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What it should do

Split domain name by dot separator. Example: splitDomainParts("example.com") -> ["example", "com"]

What happens instead

str.split(".") treats dot as regex wildcard matching every single character, returning empty array

public class Main {
    public static String[] splitDomainParts(String domain) {
        // split() takes a regex; '.' matches any character in regex!
        return domain.split(".");
    }

    public static void main(String[] args) {
        System.out.println(java.util.Arrays.toString(splitDomainParts("example.com")));
    }
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

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This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

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public class Main { public static String[] splitDomainParts(String domain) { // split() takes a regex; '.' matches any character in regex! return domain.split("."); } public static void main(String[] args) { System.out.println(java.util.Arrays.toString(splitDomainParts("example.com"))); } }

Regex split on literal dot splits every character

What it should do

What happens instead

More logic errors to practise

Regex split on literal dot splits every character

What it should do

What happens instead

More logic errors to practise