[Solved] How “java.util.Comparator.compare(String o1, String o2) ” method works

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Strings are comparable in a lexicographic order (i.e., the order they’d appear in a dictionary). If you want to implement a Comparator for clothes sizes, you’d have to write the logic yourself. E.g.:

public class ClothesSizeComparator implements Comparator<String> {
    private static final List<String> SIZES = 
        Arrays.asList("XS", "S", "M", "L", "XL", "XXL", "3XL");

    @Override
    public int compare(String s1, String s2) {
        int s1pos = SIZES.indexOf(s1);
        int s2pos = SIZES.indexOf(s2);
        return Integer.compare(s1pos, s2pos);
    }
}

Note: This Comparator assumes that both strings represent valid clothe sizes. If this assumption can’t be made, you’d have to add some error handling.

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solved How “java.util.Comparator.compare(String o1, String o2) ” method works