java - 我如何检查数组列表是否包含某个字符串

Question

我看过这里，但我得到的东西并没有真正起作用。这是运行的代码，但它没有按照我的预期去做

package bcu.gui;

import java.util.ArrayList;
import java.util.Arrays;

public class compare {

    private static ArrayList<String> list = new ArrayList<String>();

    public static void main(String[] args) {
        list.add("Paul");
        list.add("James");

        System.out.println(list); // Printing out the list

        // If the list containsthe name Paul, then print this. It still doesn't print even though paul is in the list
        if(Arrays.asList(list).contains("Paul")){
            System.out.println("Yes it does");
        }

    }

}

Answer 1

你不必这样做:

if(Arrays.asList(list).contains("Paul"))

因为标识符 list 已经是一个 ArrayList

你需要做的:

if(list.contains("Paul")){
    System.out.println("Yes it does");
}