三种方式遍历ArrayList

Posted 2022-08-24 lsswudi

package com.Test01;

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

public class ArrayListDemo 
    public static void main(String[] args) 
        //创建ArrayList集合对象
        ArrayList<Student> array = new ArrayList<Student>();

        //创建学生对象  提前定义学生类
        Student s1 = new Student("王五",20);
        Student s2 = new Student("张五",21);
        Student s3 = new Student("李五",22);

        //添加学生对象到集合中

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

        //迭代器遍历集合:集合特有的遍历方式
        Iterator<Student> it = array.iterator();
        while(it.hasNext()) 
            Student s = it.next();
            System.out.println(s.getName()+","+s.getAge());
        
        System.out.println("------------------------");

        //普通for遍历，带有索引
        for(int i = 0;i<array.size();i++) 
            Student s = array.get(i);
            System.out.println(s.getName()+","+s.getAge());
        
        System.out.println("-----------------------");

        //增强for遍历
        for(Student s : array) 
            System.out.println(s.getName()+","+s.getAge());