Java Collections Framework

import java.util.*;public class CollectionUtils {        // List operations    public static <T> List<T> createList(T... elements) {        return new ArrayList<>(Arrays.asList(elements));    }        public static <T> void addAll(List<T> list, Collection<T> collection) {        list.addAll(collection);    }        public static <T> boolean contains(List<T> list, T element) {        return list.contains(element);    }        // Set operations    public static <T> Set<T> createSet(T... elements) {        return new HashSet<>(Arrays.asList(elements));    }        public static <T> Set<T> union(Set<T> set1, Set<T> set2) {        Set<T> result = new HashSet<>(set1);        result.addAll(set2);        return result;    }        public static <T> Set<T> intersection(Set<T> set1, Set<T> set2) {        Set<T> result = new HashSet<>(set1);        result.retainAll(set2);        return result;    }        // Map operations    public static <K, V> Map<K, V> createMap() {        return new HashMap<>();    }        public static <K, V> void putAll(Map<K, V> map, Map<K, V> other) {        map.putAll(other);    }        public static <K, V> V getOrDefault(Map<K, V> map, K key, V defaultValue) {        return map.getOrDefault(key, defaultValue);    }        // Queue operations    public static <T> Queue<T> createQueue() {        return new LinkedList<>();    }        public static <T> void enqueue(Queue<T> queue, T element) {        queue.offer(element);    }        public static <T> T dequeue(Queue<T> queue) {        return queue.poll();    }}

// List usageList<String> names = new ArrayList<>();names.add("Alice");names.add("Bob");names.add("Charlie");// Iteratefor (String name : names) {    System.out.println(name);}// Access by indexString first = names.get(0);// Set usageSet<Integer> numbers = new HashSet<>();numbers.add(1);numbers.add(2);numbers.add(1); // Duplicate ignored// Check membershipboolean contains = numbers.contains(2);// Map usageMap<String, Integer> ages = new HashMap<>();ages.put("Alice", 30);ages.put("Bob", 25);// Get valueInteger age = ages.get("Alice");// Iterate mapfor (Map.Entry<String, Integer> entry : ages.entrySet()) {    System.out.println(entry.getKey() + ": " + entry.getValue());}// Queue usageQueue<String> queue = new LinkedList<>();queue.offer("First");queue.offer("Second");String next = queue.poll(); // "First"// Sorted collectionsTreeSet<Integer> sorted = new TreeSet<>();sorted.add(3);sorted.add(1);sorted.add(2);// Automatically sorted: [1, 2, 3]// Collections utility methodsList<Integer> list = Arrays.asList(3, 1, 2);Collections.sort(list);Collections.reverse(list);int max = Collections.max(list);