在ArrayList中搜索String实例

import java.util.ArrayList;

public class SearchInArrayList {
    public static void main(String[] args) {
        // 创建一个ArrayList并添加一些String实例
        ArrayList<String> list = new ArrayList<>();
        list.add("Apple");
        list.add("Banana");
        list.add("Cherry");

        // 要搜索的字符串
        String searchString = "Banana";

        // 使用contains()方法搜索
        if (list.contains(searchString)) {
            System.out.println("ArrayList contains the string: " + searchString);
        } else {
            System.out.println("ArrayList does not contain the string: " + searchString);
        }

        // 使用indexOf()方法搜索并获取索引
        int index = list.indexOf(searchString);
        if (index != -1) {
            System.out.println("The string is found at index: " + index);
        } else {
            System.out.println("The string is not found in the ArrayList.");
        }
    }
}

import java.util.HashSet;

public class FastSearch {
    public static void main(String[] args) {
        // 创建一个HashSet并添加一些String实例
        HashSet<String> set = new HashSet<>();
        set.add("Apple");
        set.add("Banana");
        set.add("Cherry");

        // 要搜索的字符串
        String searchString = "Banana";

        // 使用contains()方法搜索
        if (set.contains(searchString)) {
            System.out.println("HashSet contains the string: " + searchString);
        } else {
            System.out.println("HashSet does not contain the string: " + searchString);
        }
    }
}