使用子字符串将用户输入的字符串中的所有元音替换为星号：

import java.util.Scanner;


public class MarkVowels

{/** 来自 时 代 J a v a**/

  static Scanner sc = new Scanner(System.in);


  public static void main(String[] args)

  {

    System.out.print("Enter a string: ");

    String s = sc.nextLine();

    String originalString = s;


    int vowelCount = 0;


    for (int i = 0; i < s.length(); i++)

    {//from N  o w  J a v a . c o m

      char c = s.charAt(i);

      if (    (c == 'A') || (c == 'a')

           || (c == 'E') || (c == 'e')

           || (c == 'I') || (c == 'i')

           || (c == 'O') || (c == 'o')

           || (c == 'U') || (c == 'u') ){

        String front = s.substring(0, i);