What are the commonly used collection tools in Java function libraries?

The Java standard library provides a variety of collection tools for storing and manipulating data. Common ones are: List (ArrayList, LinkedList) Set (HashSet, TreeSet) Map (HashMap, TreeMap) Queue (ArrayDeque, LinkedBlockingQueue). These tools are available Used to store various data structures, such as student object lists (using List storage).

Commonly used collection tools in the Java function library

The Java standard library provides many practical collection tools for storing and Manipulate data structures. The following introduces some commonly used collection tools:

List

• ArrayList: Dynamic array based on array implementation, allowing insertion and deletion of elements .
• LinkedList: A list based on linked list, which is efficient in inserting and deleting elements in the middle.

Set

• HashSet: A set based on a hash table that stores unique elements and does not guarantee the order of elements.
• TreeSet: A red-black tree-based set that stores unique elements and maintains natural order or specifies comparator order.

Map

• HashMap: Map based on hash table, stores key-value pairs, and does not guarantee the order of elements.
• TreeMap: A red-black tree-based mapping that stores key-value pairs and maintains natural order or specifies comparator order.

Queue

• ArrayDeque: A queue-based deque that allows elements to be added and removed from both ends of the queue .
• LinkedBlockingQueue: Linked list-based blocking queue, used in producer and consumer scenarios.

Practical case

Suppose we have a class named Student, which contains the name and score of the student. We can use List to store a set of student objects:

import java.util.ArrayList;
import java.util.List;

public class StudentList {

    public static void main(String[] args) {
        // 创建一个 ArrayList 来存储学生对象
        List<Student> students = new ArrayList<>();

        // 添加一些学生到列表中
        students.add(new Student("Alice", 90));
        students.add(new Student("Bob", 85));
        students.add(new Student("Charlie", 95));

        // 迭代列表并打印每个学生的姓名和分数
        for (Student student : students) {
            System.out.println(student.getName() + ": " + student.getScore());
        }
    }
}

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