Question

I am trying to read from a file and add each line from the file to my array “Titles” but keep getting the error:

Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 0

Any Ideas? I am getting the error because of the line reading:

      Titles[lineNum] = m_line;                 

My code:

String[] Titles={};
int lineNum;            
m_fileReader = new BufferedReader(new FileReader("random_nouns.txt"));
m_line = m_fileReader.readLine();           
while (m_line != null)              
{       
        Titles[lineNum] = m_line;               
        m_line = m_fileReader.readLine();               
        lineNum++;              
}

Thank you in advance!

Answer 1

array indexes start with 0. if length of an array is N, then the last index would be N-1. currently your array has a length of zero and you are trying to access an element at index 0(which does exist).

String[] Titles={};//length zero

and in your while loop

 Titles[lineNum] = m_line;  //trying to access element at 0 index which doesnt exist.

I would suggest you use ArrayList instead of Array in your case. as ArrayList is dynamic (you dont have to give size for it)

     List<String> titles = new ArrayList<String>();

       while (m_line != null)              
      {       
        titles.add(m_line);               
       }