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

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Need to change every word, that starts with vowel to the longest one. Everything seems ok, however have faced with an unexpected behaviour from the loop, when I enter into it - scanner wants an input (7th line). Instead of asking for an input, it should iterate through every element (word) from the sentence I've set previously (2nd line). I do assume, that I've missed something.

    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;
    }
java.util.scanner loops java
1 Answers

By looking at your code, I see you are trying to find the longest string in a sentence inputted by user.
There is no need to input every word individually when you simply could input the entire line. Something like the following code could help you:

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));
    }
}

When run with input Find the longest word in this large sentence this outputs:

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