java - 在 if 语句中使用字符串数组的值

Question

在这种情况下，如果用户输入数组 fruits 中可用的任何一个值，我希望 if 语句为 true，但我不明白如何实现这一点。

import java.util.Scanner;

public class Strings {

public static void main(String[] args) {


Scanner Scan = new Scanner(System.in);
String[] fruits = {"Apple", "apple", "Banana", "banana", "Orange", "orange"};

System.out.println("Enter a name of a fruit: ");
String input = Scan.nextLine();
if(/*input = any one of the values in Array fruits*/){
    System.out.println("Yes, that's a fruit");
        }
else{
    System.out.println("No, that's not a fruit.");
}

Answer 1

实现此目的的最简单方法是将数组转换为 List 并使用 contains 方法:

List<String> fruits =
    Arrays.asList("Apple", "apple", "Banana", "banana", "Orange", "orange");

System.out.println("Enter a name of a fruit: ");
String input = Scan.nextLine();
if(fruits.contains(input) {
    System.out.println("Yes, that's a fruit");
        }
else{
    System.out.println("No, that's not a fruit.");
}

但是，这可能会带来相当糟糕的性能。将其转换为 HashSet 应该可以解决这个问题:

Set<String> fruits = 
    new HashSet<>(Arrays.asList("Apple", "apple", "Banana", "banana", "Orange", "orange"));
// rest of the code unchanged