Java list使用

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

public class ListExample { public static void main(String[] args) { // 创建一个 ArrayList List mylist = new ArrayList<>();

    // 添加元素
    mylist.add("Apple");
    mylist.add("Banana");
    mylist.add("Orange");

    // 遍历元素
    System.out.println("Elements in the list:");
    for (String fruit : mylist) {
        System.out.println(fruit);
    }

    // 获取元素
    String firstFruit = mylist.get(0);
    System.out.println("First fruit: " + firstFruit);

    // 修改元素
    mylist.set(1, "Grapes");
    System.out.println("Modified list:");
    for (String fruit : mylist) {
        System.out.println(fruit);
    }

    // 删除元素
    mylist.remove("Orange");
    System.out.println("List after removing Orange:");
    for (String fruit : mylist) {
        System.out.println(fruit);
    }

    // 检查是否包含元素
    boolean containsBanana = mylist.contains("Banana");
    System.out.println("List contains Banana: " + containsBanana);

    // 获取列表大小
    int size = mylist.size();
    System.out.println("Size of the list: " + size);
}

}