课堂代码
package list;

import java.util.ArrayList;

public class ArrayListDemo01 {
public static void main(String[]args){
String[]array01 = new String[10];
array01[0] = "zhangsan";
array01[1] = "lisi";
array01[2] = "wangwu";

    ArrayList<Object>list01 = new ArrayList<>(); // 数组列表
    //1 增加
    list01.add("zhangsan");
    list01.add("lisi");
    list01.add("wangwu");
    System.out.println(list01);
    //2 删除
    list01.remove(1);
    System.out.println(list01);
    //3 修改
    /*String v = (String)list01.set(1,"xiaowu");
    System.out.println(v);*/
    list01.set(1,"xiaowu");
    System.out.println(list01);
    //4 查询
    for (Object l:list01){
        System.out.println(l+"\t");
    }
    //5 求长度
    System.out.println(list01.size());
    //6 清空
    list01.clear();
    System.out.println(list01.size());
    System.out.println(list01.isEmpty());
    //7 addAll()
    ArrayList<Object> list02 = new ArrayList<>();
    list02.add(111);
    list02.add(222);
    list01.addAll(1,list02);
    System.out.println(list01);

}

}

package list;

import java.util.ArrayList;
import java.util.LinkedList;

public class linkedlistDemo02{

    public static void main(String[]args){

        LinkedList<Object> list01 = new LinkedList<>(); //链表的方式实现
        //System.out.println(list01.size());
        //1 增加
        list01.add("zhangsan");
        list01.add("lisi");
        list01.add("wangwu");
        System.out.println(list01);
        //2 删除
        list01.remove(1);
        System.out.println(list01);
        //3 修改
    /*String v = (String)list01.set(1,"xiaowu");
    System.out.println(v);*/
        list01.set(1,"xiaowu");
        System.out.println(list01);
        //4 查询
        for (Object l:list01){
            System.out.println(l+"\t");
        }
        //5 求长度
        System.out.println(list01.size());
        //6 清空
        /* list01.clear();
        System.out.println(list01.size());
        System.out.println(list01.isEmpty()); */
        //7 addAll()
        ArrayList<Object> list02 = new ArrayList<>();
        list02.add(111);
        list02.add(222);
        list01.addAll(1,list02);
        System.out.println(list01);
        // 将数据 111
        list01.addFirst(999);
        System.out.println(list01);
    }
}