java - 显示 StringIndexOutOfBoundExceptions 错误

Question

我正在尝试根据用户输入的三个单词创建首字母缩略词:

 import java.util.Scanner;
 public class Acronym
 {
    public static void main(String[] args)
    {    

       Scanner input = new Scanner(System.in);
       String phrase;
       System.out.println("Please, enter the three words here>> ");
       phrase = input.nextLine();     
       char first, second, third;
       int stringLength;
       int x = 0;
       char c;
       stringLength = phrase.length();
       first = phrase.charAt(0);
       second = phrase.charAt(x + 1);
       third = phrase.charAt(x + 1);

          for( x = 0; x < stringLength; x++);
          {
             int a = 1;
             c = phrase.charAt(x);

             if(Character.isWhitespace(c));
               if( a <= 1)
                second = phrase.charAt(x+1);

             else if(a <= 2)
                third = phrase.charAt(x++);
          }

      System.out.println("The acronym is " + first + second + third);
   }

 }

但是，每当我尝试输入 StringIndexOutOfBoundExceptions 时，就会显示错误。例如，我尝试输入三个单词“一二三”，结果如下:

请输入单词/短语:一二三

线程“main”中出现异常 java.lang.StringIndexOutOfBoundsException:字符串索引超出范围:13 在 java.lang.String.charAt(String.java:646) 在 Acronym.main(Acronym.java:23)

Answer 1

删除分号

for (x = 0; x < stringLength; x++);
                                  ^

它正在终止 for 循环。与终止 if 语句的分号相同

if (Character.isWhitespace(c));
                              ^

请使用大括号括住控制 block