Case - the ArrayList collection stores student objects and traverses them in three ways

package com.it.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.it.anli;

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

public class Demo {
    public static void main(String[] args) {

        ArrayList<Student> array = new ArrayList<>();

        Student s1 = new Student(" eldest brother ", 22);
        Student s2 = new Student(" Second brother ", 21);
        Student s3 = new Student(" Three elder brother ", 20);

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

        //1. Iterator traversal 

        Iterator<Student> it = array.iterator();
        while (it.hasNext()) {
            Student s = it.next();
            System.out.println(s.getName() + "," + s.getAge());
        }

        System.out.println("================================");
        //2. Ordinary for
        for (int i = 0; i < array.size(); i++) {
            Student ss = array.get(i);
            System.out.println(ss.getName() + "," + ss.getAge());
        }
        System.out.println("================================");
        //3. enhance for
        for (Student sss:array) {
            System.out.println(sss.getName() + "," + sss.getAge());
        }


    }
}