Java: how to store data triple in a list?

Java: how to store data triple in a list?

To store data triples in a list in Java, you can use a variety of approaches. A data triple typically means you want to store three related values together. Here are some common methods:

1. Create a Custom Class

The most straightforward way is to create a custom class that represents your data triple, and then store instances of this class in a list.

public class DataTriple { private Object first; private Object second; private Object third; public DataTriple(Object first, Object second, Object third) { this.first = first; this.second = second; this.third = third; } // getters and setters }

You can then create a list of DataTriple objects:

List<DataTriple> list = new ArrayList<>(); list.add(new DataTriple("value1", "value2", "value3"));

2. Use a Tuple Library

Java does not have a built-in tuple class, but you can use a third-party library like Apache Commons Lang which provides a Triple class.

import org.apache.commons.lang3.tuple.Triple; List<Triple<Object, Object, Object>> list = new ArrayList<>(); list.add(Triple.of("value1", "value2", "value3"));

3. Use a List of Arrays

If you don't want to create a custom class or use a third-party library, another option is to use an array to hold the triple and then store these arrays in a list.

List<Object[]> list = new ArrayList<>(); list.add(new Object[]{"value1", "value2", "value3"});

4. Use a List of Lists

Similarly, you can use a list of lists, although this is less typical for fixed-size tuples like triples.

List<List<Object>> list = new ArrayList<>(); List<Object> triple = Arrays.asList("value1", "value2", "value3"); list.add(triple);

5. Use Map.Entry for Pairs and Add Another Element

For pairs, Java provides Map.Entry, and you can combine this with another element for a triple. However, this is a bit unconventional and less clear than the other methods.

List<Map.Entry<Map.Entry<Object, Object>, Object>> list = new ArrayList<>(); list.add(new AbstractMap.SimpleEntry<>(new AbstractMap.SimpleEntry<>("value1", "value2"), "value3"));

Choosing the Best Method

  • Custom Class: Best for clarity and type safety, especially if the triples represent a meaningful entity in your domain.
  • Tuple Library: Good for simplicity and if you want to avoid writing extra boilerplate code.
  • Arrays or Lists: Suitable for temporary or very simple use cases.

Remember to choose the method that best aligns with your project's requirements, coding standards, and performance needs.

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