How to define a list in Java?

In Java, you can define a list using either the ArrayList or LinkedList class.

1. ArrayList:
   An ArrayList is a dynamic array based on an array implementation that can automatically adjust its size as needed. You can define an ArrayList list using the following code:

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<String>();
        // 添加元素
        list.add("apple");
        list.add("banana");
        list.add("orange");
        // 访问元素
        System.out.println(list.get(0)); // 输出：apple
        // 修改元素
        list.set(1, "grape");
        // 删除元素
        list.remove(2);
        // 遍历列表
        for (String element : list) {
            System.out.println(element);
        }
    }
}

1. LinkedList is a list implementation that is based on linked lists, allowing for operations such as insertion and deletion at any position in the list. You can define a LinkedList list using the following code:

import java.util.LinkedList;

public class Main {
    public static void main(String[] args) {
        LinkedList<String> list = new LinkedList<String>();
        // 添加元素
        list.add("apple");
        list.add("banana");
        list.add("orange");
        // 访问元素
        System.out.println(list.get(0)); // 输出：apple
        // 修改元素
        list.set(1, "grape");
        // 删除元素
        list.remove(2);
        // 遍历列表
        for (String element : list) {
            System.out.println(element);
        }
    }
}