javaNull / UndefinedEasy

Optional get() called without isPresent check

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BugFind the bug and fix the code

What it should do

Extract string value from Optional or return default "none". Example: extractOptionalValue(false, "hello") -> "none"

What happens instead

java.util.NoSuchElementException: No value present

import java.util.Optional;

public class Main {
    public static String extractOptionalValue(boolean hasVal, String val) {
        Optional<String> opt = hasVal ? Optional.of(val) : Optional.empty();
        // Calling .get() on empty Optional throws NoSuchElementException
        return opt.get();
    }

    public static void main(String[] args) {
        System.out.println(extractOptionalValue(false, "hello"));
    }
}

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 null and undefined errors pattern

Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.

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import java.util.Optional; public class Main { public static String extractOptionalValue(boolean hasVal, String val) { Optional<String> opt = hasVal ? Optional.of(val) : Optional.empty(); // Calling .get() on empty Optional throws NoSuchElementException return opt.get(); } public static void main(String[] args) { System.out.println(extractOptionalValue(false, "hello")); } }

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