这个有会的嘛，出的题不会了

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public class Student {
    private int id;
    private String name;
    private int age;
    private String sex;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                '}';
    }

    public Student() {
    }

    public Student(int id, String name, int age, String sex) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
}

Test类：

import java.util.*;

public class Test {
    public static void main(String[] args) {
        ArrayList<Student> students = new ArrayList<>();

        Student s1 = new Student(001,"张一",20,"男");
        Student s2 = new Student(002,"张二",22,"男");
        Student s3 = new Student(003,"张三",23,"男");
        Student s4 = new Student(004,"张四",24,"男");
        Student s5 = new Student(005,"张五",21,"男");

        students.add(s1);
        students.add(s2);
        students.add(s3);
        students.add(s4);
        students.add(s5);

        //迭代器
        Iterator<Student> iterator = students.iterator();
        while (iterator.hasNext()){
            Student next = iterator.next();
            System.out.println(next);
        }
        //增强for循环
        for (Student student : students) {
            System.out.println(student);
        }

    }
}

如果有帮到你，请采纳一下，谢谢