如何從使用Java

我已經在上面寫一個文件讀我剛寫使用如何從使用Java

FileWriter fWrite=new FileWriter("C:/folder/DP.txt"); 
BufferedWriter output = new BufferedWriter(fWrite); 
int lastItem = splitItems(capacity); //** calling the function that returns the last item in the file 
output.close();

然後我關閉該文件，並確信該數據已寫在上面的文件。在另一個函數中，我需要讀取我剛寫的數據。我寫了下面的代碼：

public static int splitItems(int capacity) throws IOException //read items from the file 
{ 
    BufferedReader br = new BufferedReader(new FileReader("C:/folder/DP.txt")); 

    //read the last line from file 
    String tmp, strLine = null; 
    while ((tmp = br.readLine()) != null) 
    { 
     strLine = tmp; 
    } //end while 

    String lastLine = strLine; //save the last line 

    String[] split = lastLine.split("\\s+"); /** split based on spaces 
    int lastItem=Integer.parseInt(split[capacity]); //save the int in the file 
    br.close(); //closing the file 
    return lastItem; //return the last number 

}//end split items

然後，在運行時，我得到了以下錯誤：