enum 遍历 java javalistfor遍历

package com.hspedu.list_;

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


@SuppressWarnings({"all"})
public class test506 {
    public static void main(String[] args) {
        // List集合的遍历方式（3种）


        List list = new ArrayList();
        list.add(123);
        list.add(456);
        list.add(789);

        System.out.println("====== 1 增强for循环 ======");
        for (Object object : list) {
            System.out.println(object);
        }
        System.out.println("====== 2 迭代器 ======");
        Iterator iterator = list.iterator();
        while (iterator.hasNext()) {
            Object next = iterator.next();
            System.out.println(next);
        }
        System.out.println("====== 3 普通for循环 ======");
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }
    }
}