在Java中如何使用对象数组存储多个实例_对象数组实践指南

class Student {
    private String name;
    public Student(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
}

public class Main {
    public static void main(String[] args) {
        // 声明并初始化数组
        Student[] students = new Student[3];

        // 为每个位置创建对象
        students[0] = new Student("Alice");
        students[1] = new Student("Bob");
        students[2] = new Student("Charlie");

        // 遍历输出
        for (Student s : students) {
            System.out.println(s.getName());
        }
    }
}

Student[] students = {
    new Student("Alice"),
    new Student("Bob"),
    new Student("Charlie")
};

Student[] arr = new Student[2];
// arr[0].getName(); // 错误！会抛出 NullPointerException
arr[0] = new Student("Tom");
System.out.println(arr[0].getName()); // 正确

import java.util.ArrayList;
ArrayList<Student> list = new ArrayList<>();
list.add(new Student("Alice"));
list.add(new Student("Bob"));