値ペアに Java の「Map」の代わりに「AbstractMap.SimpleEntry」を使用する必要があるのはどのような場合ですか?

// Create a list of SimpleEntry pairs
List<Map.Entry<String, Integer>> pairList = new ArrayList<>();

// Add some pairs to the list
pairList.add(new AbstractMap.SimpleEntry<>("Not Unique Key 1", 1));
pairList.add(new AbstractMap.SimpleEntry<>("Not Unique Key 2", 2));

// Create a TupleList class extending ArrayList
public class TupleList<E> extends ArrayList<E> {

    public TupleList() {}

    // Exposed method for creating and adding SimpleEntry pairs
    public void of(Object... args) {
        if (args.length % 2 != 0) {
            throw new IllegalArgumentException("Number of arguments must be even.");
        }

        for (int i = 0; i < args.length; i += 2) {
            add(new SimpleEntry<>(args[i], args[i + 1]));
        }
    }
}

// Usage
TupleList<Map.Entry<String, Integer>> pair = new TupleList<>();
pair.of("Not Unique Key 1", 1);
pair.of("Not Unique Key 2", 2);