How Can I Create and Manage Collections of Value Pairs in Java Without Using Maps?

Java Collections for Value Pairs

In Java, a Map provides a data structure for storing key-value pairs with defined types. However, the desire for a collection of value pairs without the key-based structure arises.

To achieve this, consider using the AbstractMap.SimpleEntry class. It allows the creation of simple value pairs, each with its own specified type.

Creating and Adding Pairs

To create a list of these value pairs, initialize an ArrayList of Map.Entry. You can then add pairs using:

Map.Entry<String, Integer> pair1 = new AbstractMap.SimpleEntry<>("Not Unique key1", 1);
Map.Entry<String, Integer> pair2 = new AbstractMap.SimpleEntry<>("Not Unique key2", 2);
pairList.add(pair1);
pairList.add(pair2);

Enhancing Verbosity

To reduce verbosity, employ a createEntry method:

pairList.add(createEntry("Not Unique key1", 1));
pairList.add(createEntry("Not Unique key2", 2));

Syntactic Conciseness

Subclass ArrayList to implement an of method:

pair.of("Not Unique key1", 1);
pair.of("Not Unique key2", 2);

With AbstractMap.SimpleEntry, you can create collections of ordered value pairs, providing a concise and type-safe solution for storing pairs of values.

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