Detailed interpretation of operations and methods in the Java dynamic set framework

Detailed interpretation of operations and methods in the Java dynamic set framework The Java dynamic set framework provides a set of powerful data structures and algorithms for storage and operation data.In this article, we will introduce the operations and methods commonly used in the Java dynamic set framework. 1. ArrayList (array list) ArrayList is one of the most commonly used categories in the Java dynamic set framework.It implements a dynamic array that can automatically expand to accommodate more elements.Here are some common operations and methods of ArrayList: -Cap element: Use the add () method to add elements to ArrayList. ArrayList<String> arrayList = new ArrayList<>(); ArrayList.add ("Element 1"); -Cap the element: Use the get () method to obtain the elements in ArrayList according to the index. String element = arrayList.get(0); -State element: Use the Remove () method to delete the elements in ArrayList according to the value of the index or element. arrayList.remove(0); 2. LinkedList (Links) LinkedList is an implementation of a two -way linked list and one of the commonly used classes in the Java dynamic set framework.Here are some common operations and methods of LinkedList: -Ad the element: Use the add () method to add the element to the LinkedList. LinkedList<String> linkedList = new LinkedList<>(); linkedList.add ("Element 1"); -Cap the element: Use the get () method to obtain the elements in LinkedList according to the index. String element = linkedList.get(0); -State element: Use the Remove () method to delete the elements in LinkedList according to the value of the index or element. linkedList.remove(0); 3. HashSet (hash collection) Hashset is one of the commonly used classes in the Java dynamic set framework. It is based on a set of the hash table.Here are some common operations and methods of HashSet: -Ad the element: Use the ADD () method to add the element to the hashset. HashSet<String> hashSet = new HashSet<>(); Hashset.add ("Element 1"); -Check whether the element exists: Use the Contains () method to check whether the element exists in the HashSet. boolean containsElement = hashSet.contains("元素1"); -State element: Use the Remove () method to delete the elements in the hashset. Hashset.remove ("Element 1"); 4. HashMap (hash map) HashMap is one of the most commonly used categories in the Java dynamic set framework. It is a mapping based on hash tables.Here are some common operations and methods of HashMap: -Ad key value pair: Use the PUT () method to add key values to the HashMap. HashMap<String, Integer> hashMap = new HashMap<>(); HashMap.put ("Key 1", 1); -Cap value: Use the get () method to obtain the value in the hashmap according to the key. Integer value = hashMap.get("键1"); -Fot the key value: use the Remove () method to delete the key value pair in HashMap. Hashmap.remove ("key 1"); By using these commonly used operations and methods, we can easily add, obtain and delete the data in the Java dynamic set framework.These functions are very practical and are very common and important when writing the Java program.I hope this article will help you understand the common operations and methods of the Java dynamic set framework.