Comparator

An object that defines an external ordering for values.

What is Comparator in Java?

Comparator — An object that defines an external ordering for values.

import java.util.Comparator;

class NameLengthComparator implements Comparator<String> {
    @Override
    public int compare(String first, String second) {
        return Integer.compare(first.length(), second.length());
    }
}

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Updated September 27, 2026