字符串錯誤

Question

所以我的代碼工作的一些話，但不是別人它衝刺了字符串索引超出範圍：-1 IM想每個元音和元音集羣 EX可疑之前打印出來UB將dubububious或貓loveo將lubovudeo

字符串犯罪，設置;

 sentance = "toster iooppp"; 
     set= translate(sentance); 
     System.out.println(set); 
} 
public static String translate (String sentence){ 

    String set = " "; 
    sentence= sentence.toLowerCase(); 
    scan = new Scanner (sentence); 

    while (scan.hasNext()) { 

     set+= toUbbi (scan.next()); 
     set += " "; 
    } 
    return set; 
    } 

private static String toUbbi(String word) { 
    String str= word; 
    String new_str=""; 
    for (int i = 0; i < str.length(); i++) { 
      char c = str.charAt(i); 
      if (isVowel(c) && isVowel(str.charAt(i -1))) 
      { // If is a vowel 
       new_str += "ub" ; 
      } 
      new_str += c; 
     } 
    return new_str; 
    } 


    private static boolean isVowel(char c) 
    { 
     if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'){ 
      return true;} 

     return false;  

Answer 1

在第一次迭代中提示錯誤..

 if (isVowel(c) && isVowel(str.charAt(i -1))) 
     { // If is a vowel 
      new_str += "ub" ; 
     } 

所以改變這樣的..

 if (isVowel(c)) 
     { // If is a vowel 
      new_str += "ub" ; 
     } 

或更改你的循環..

for (int i = 1; i < str.length(); i++) { 
     // yur remain code... 
    }