javaLogic errorMedium

Equality Check Fails for Certain Integer Values

Time: 0:00

BugFind the bug and fix the code

What it should do

Check if two integers are equal. Example: checkEquality(100, 100) -> true

What happens instead

AssertionError: Expected true but was false for certain integer values.

public class IntegerEquality {
    public static boolean checkEquality(Integer a, Integer b) {
        return a == b;
    }

    public static void main(String[] args) {
        assert checkEquality(100, 100);
        assert !checkEquality(200, 200);
    }
}

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.

Learn the logic errors pattern Step through your own code

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public class IntegerEquality { public static boolean checkEquality(Integer a, Integer b) { return a == b; } public static void main(String[] args) { assert checkEquality(100, 100); assert !checkEquality(200, 200); } }

Equality Check Fails for Certain Integer Values

What it should do

What happens instead

More logic errors to practise

Equality Check Fails for Certain Integer Values

What it should do

What happens instead

More logic errors to practise