Ka Commons Collections framework advanced technique in the Java class library

Ka Commons Collections framework advanced technique in the Java class library Ka Commons Collections is a popular Java class library that provides many useful data structures and algorithms.This article will introduce some advanced techniques for Ka Commons Collections framework to help developers better use this powerful tool. 1. Data structure of using Apache Ka Commons Collections Ka Commons Collections provides many commonly used data structures, such as List, SET, MAP, etc.These data structures have many powerful functions and methods, which can help developers handle and operate data more efficiently. For example, we can use the method in the Listutils class to merge the two lists: List<String> list1 = new ArrayList<>(); list1.add("A"); list1.add("B"); List<String> list2 = new ArrayList<>(); list2.add("C"); list2.add("D"); List<String> mergedList = ListUtils.union(list1, list2); System.out.println (MERGEDList); // Output [A, B, C, D] 2. Use Apache Ka Commons Collections algorithm In addition to the data structure, Ka Commons Collections also provides many commonly used algorithms and operations.One of the very useful algorithms is the Filter method in the CollectionUtils class, which can screen the elements from the set according to the specified conditions. List<Integer> numbers = new ArrayList<>(); numbers.add(1); numbers.add(2); numbers.add(3); numbers.add(4); List<Integer> evenNumbers = (List<Integer>) CollectionUtils.select(numbers, number -> number % 2 == 0); System.out.println (EVENNUMBERS); // Output [2, 4] 3. Use Apache Ka Commons Collections Ka Commons Collections provides many convenient iterators, enabling developers to pass on the collection more flexibly. For example, we can use the method in the IteratorUtils class to alternate the elements of the two listings: List<String> list1 = Arrays.asList("A", "B", "C"); List<String> list2 = Arrays.asList("1", "2", "3"); Iterator<String> iterator = IteratorUtils.chainedIterator(list1.iterator(), list2.iterator()); while (iterator.hasNext()) { System.out.println (Iterator.next ()); // Output A 1 B 2 C 3 } 4. Use Apache Ka Commons Collection Ka Commons Collections also provides many decorative classes, which can add additional functions to the existing set without the need to modify the original collection. For example, we can use the synchronizedCollection decorative class to create a thread -safe collection: List<String> list = new ArrayList<>(); Collection<String> synchronizedList = CollectionUtils.synchronizedCollection(list); // Systemly operate SynchronizeDlist safely in multiple threads Summarize: The above are the advanced skills of some Ka Commons Collections framework.Through these techniques, developers can better use the functions provided by Ka Commons Collections to improve the efficiency and maintenance of code.I hope the content of this article will help you understand and apply Ka Commons Collections framework.