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
Set
Map
Queue
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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