A KeyValuePair in Java

A KeyValuePair in Java

In Java, a KeyValuePair is not a standard class or data structure provided by the Java programming language itself. However, you can create a key-value pair using various approaches:

  1. Using Map.Entry: Java provides the Map.Entry interface, which represents a key-value pair within a Map. You can use this interface to create key-value pairs:

    import java.util.Map; import java.util.HashMap; public class KeyValuePairExample { public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(1, "One"); map.put(2, "Two"); for (Map.Entry<Integer, String> entry : map.entrySet()) { Integer key = entry.getKey(); String value = entry.getValue(); System.out.println("Key: " + key + ", Value: " + value); } } }

    In this example, we create key-value pairs using a HashMap and iterate through them using the Map.Entry interface.

  2. Creating a custom class: Alternatively, you can create your own custom class to represent key-value pairs. Here's an example:

    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 String toString() { return "Key: " + key + ", Value: " + value; } }

    You can use this custom class to create key-value pairs for any types of keys and values:

    KeyValuePair<Integer, String> pair = new KeyValuePair<>(1, "One"); System.out.println(pair); // Key: 1, Value: One

    This custom KeyValuePair class allows you to create key-value pairs for various data types.

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