Convert Set<Map.Entry<K, V>> to HashMap<K, V> in java

Convert Set<Map.Entry<K, V>> to HashMap<K, V> in java

To convert a Set<Map.Entry<K, V>> to a HashMap<K, V> in Java, you can iterate through the Set of Map.Entry objects and put each entry into the HashMap. Here's how you can do it:

import java.util.*; public class SetToHashMapConversion { public static void main(String[] args) { // Create a Set of Map.Entry objects Set<Map.Entry<String, Integer>> entrySet = new HashSet<>(); // Add some entries to the Set entrySet.add(new AbstractMap.SimpleEntry<>("one", 1)); entrySet.add(new AbstractMap.SimpleEntry<>("two", 2)); entrySet.add(new AbstractMap.SimpleEntry<>("three", 3)); // Convert the Set to a HashMap HashMap<String, Integer> hashMap = setToHashMap(entrySet); // Print the HashMap System.out.println(hashMap); } public static <K, V> HashMap<K, V> setToHashMap(Set<Map.Entry<K, V>> entrySet) { HashMap<K, V> hashMap = new HashMap<>(); for (Map.Entry<K, V> entry : entrySet) { hashMap.put(entry.getKey(), entry.getValue()); } return hashMap; } }

In this example:

  1. We create a Set<Map.Entry<String, Integer>> named entrySet and add some entries to it.

  2. The setToHashMap method takes a Set<Map.Entry<K, V>> as an argument and converts it to a HashMap<K, V>.

  3. Inside the setToHashMap method, we iterate through the entrySet and add each entry to the HashMap using the put method.

  4. Finally, we return the resulting HashMap.

When you run this code, it will convert the Set of Map.Entry objects to a HashMap and print the HashMap contents:

{three=3, one=1, two=2}

This demonstrates how to convert a Set<Map.Entry<K, V>> to a HashMap<K, V> in Java.

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