Case - the list set stores student objects and traverses them in three ways

package com.anli;

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

    public Student() {
    }

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

    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;
    }

}

package com.anli;

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

public class Demo {
    public static void main(String[] args) {
        List<Student> list = new ArrayList<>();

        Student s1 = new Student("1", 21);
        Student s2 = new Student("2", 22);
        Student s3 = new Student("3", 23);

        list.add(s1);
        list.add(s2);
        list.add(s3);

        // A collection of traverse 
        //① Iterator traversal 
        Iterator<Student> it = list.iterator();
        while (it.hasNext()) {
            Student ss = it.next();
            System.out.println(ss.getName() + "," + ss.getAge());
        }

        //② Ordinary for Traversal with index 
        for (int i = 0; i < list.size(); i++) {
            Student sss = list.get(i);
            System.out.println(sss.getName() + "," + sss.getAge());
        }

// enhance for
        for (Student stu : list) {
            System.out.println(stu.getName() + "," + stu.getAge());
        }
    }
}