Loop 需要一个输入，而它应该遍历先前输入的每个单词

Question

需要将以元音开头的每个单词更改为最长的一个。一切似乎都很好，但是当我进入它时，遇到了来自循环的意外行为 - 扫描仪需要输入（第 7 行）。它不要求输入，而是应该遍历我之前设置的句子（第 2 行）中的每个元素（单词）。我假设我错过了一些东西。

    Scanner sc = new Scanner(System.in);
    String textToFormat = sc.nextLine();
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(textToFormat);

    while (sc.hasNext()) {
      currentWord = sc.next();
      if (currentWord.length() > longestWord.length()) {
        longestWord = currentWord;

      } else break;
    }

Answer 1

通过查看您的代码，我发现您正在尝试查找用户输入的句子中最长的字符串。
当您只需输入整行时，无需单独输入每个单词。类似以下代码的内容可以帮助您：

import java.util.Scanner;

public class Main {

    public static String findLongestWord(String[] arr){
        String longest = "";
        for (String current : arr){
            // If the current word is larger than the longest.
            if(current.length() > longest.length()){
                longest = current; // Then set longest word to current.
            }
        }
        return longest;
    }

    public static void main(String[] args) {
        // Get the sentence from the user.
        System.out.println("Input a sentence: ");
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        // Split sentence into words.
        String[] arr = s.split("\W+");
        System.out.println("Longest word is " + findLongestWord(arr));
    }
}

当运行输入 Find the longest word in this large sentence 时输出：

Input a sentence: 
Find the longest word in this large sentence.
Longest word is sentence

Loop 需要一个输入，而它应该遍历先前输入的每个单词

Loop expects an input, while it should've iterated through every word of previous input

java

loops

java.util.scanner