平均字長

Question

我想獲得的平均字長爲一組字符串，我運行到下面的錯誤：

java.lang.StringIndexOutOfBoundsException：字符串索引超出範圍：-1

我不確定它是由什麼引起的。這裏是我的代碼：

static double getAverageWordLength() { 

    // TODO: update the code here to return the average length of words in the tweets processed so far. 

    String[] average = tweeps.split(" "); 

    int count = 0; 
    int sum = 0; 
    int currentWordLength; 
    String tempString; 
    for(int i = 0; i < average.length; i++) 
    { 
     average[i] = average[i].replaceAll("[^a-zA-Z]", "").toLowerCase(); 
     tempString = average[i]; 
     currentWordLength = tempString.length(); 
     sum += currentWordLength; 
     count++; 
    } 
    double averageWordLength = sum/count; 
    return averageWordLength; 
} 

Answer 1

import java.lang.*; 

class test{ 

    public static void main(String args[]) 
    { 
     String MySentence = "This is My Word. I'm Going to Find the Average of this"; 
     System.out.println(" Average Length :"+ getAverageWordLength(MySentence)); 
    } 

    static double getAverageWordLength(String tweeps) { 

     // TODO: update the code here to return the average length of 
     // words in the tweets processed so far. 

     String[] average = tweeps.split(" "); 

     int count = 0; 
     int sum = 0; 
     int currentWordLength; 
     String tempString; 
     for(int i = 0; i < average.length; i++) 
     { 
      average[i] = average[i].replaceAll("[^a-zA-Z]", "").toLowerCase(); 
      tempString = average[i]; 
      currentWordLength = tempString.length(); 
      sum += currentWordLength; 
      count++; 
     } 
     double averageWordLength = sum/count; 
     return averageWordLength; 
    } 
}