List接口

package com.msb;

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

/**
 * @author lcc
 * @version V1.0
 * @Package com.msb
 * @date 2022/4/23 21:59
 */
public class ArrayListTest {
    public static void main(String[] args) {
        List list=new ArrayList();
        list.add(32);
        list.add(12);
        list.add(12);
        list.add(44);
        System.out.println(list);
        list.add("32");//默认不写下标就在后面追加元素
        list.add(2, 999);
        System.out.println(list);
        list.set(2, 888);//修改下标为2的元素
        System.out.println(list);
        list.remove(2);//删除下标为2的元素
        System.out.println(list);
        list.remove("32");
        System.out.println(list);
        System.out.println(list.get(0));

        //遍历集合
        for (int i = 0; i <list.size() ; i++) {
            System.out.print(list.get(i));
        }
        System.out.println();
        //增强for循环
        for (Object o : list) {
            System.out.print(o);
        }
        System.out.println();
        //迭代器
        Iterator iterator = list.iterator();
        while (iterator.hasNext()){
            System.out.print(iterator.next());
        }


    }
}