A KeyValuePair in Java

In Java, a KeyValuePair represents a single key-value entry, unlike a Map which is a collection of multiple entries. It is a simple way to store data as a key-value pair.

Here is an example of a KeyValuePair class in Java:

import java.util.Objects;

public class KeyValuePair<K, V> {
    private K key;
    private V value;
    
    public KeyValuePair(K key, V value) {
        this.key = key;
        this.value = value;
    }
    
    public K getKey() {
        return key;
    }
    
    public V getValue() {
        return value;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        KeyValuePair<?, ?> that = (KeyValuePair<?, ?>) o;
        return Objects.equals(key, that.key) && Objects.equals(value, that.value);
    }

    @Override
    public int hashCode() {
        return Objects.hash(key, value);
    }
}

You can use the KeyValuePair class like this:

KeyValuePair<String, Integer> pair = new KeyValuePair<>("key", 10);
String key = pair.getKey();
int value = pair.getValue();

Note that Java does not have a built-in KeyValuePair class. You can define your own as shown above, or use standard alternatives like javafx.util.Pair or org.apache.commons.lang3.tuple.Pair from Apache Commons Lang.