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Thread: NullPointerException when trying to read Strings into an array of myObject

  1. #1
    Junior Member
    Join Date
    Apr 2010
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    Unhappy NullPointerException when trying to read Strings into an array of myObject

    Hi All,

    I've created an Object that holds two Strings, myObject. I have created and array of myObject and I am trying to parse some .csv data into it using a StringTokenizer however I keep getting a null pointer exception.

    If I treat myObject as a simple Object and not as an array everything works ok.



    P.S. I'm new to this forum, please excuse me if I've copied too much of my code into this query

    import java.io.IOException;
    import java.util.StringTokenizer;
    public class ForexAnalyzer {
        public static void main (String args[])throws IOException {
            FileArrayProvider bulkReader = new FileArrayProvider();
            String[] rawData = bulkReader.readLines("src/EURUSD602.csv");
    	    myObject[] parsedData = new myObject[bulkReader.getLength()];
            StringTokenizer token = null;
    	    for (int i=0; i<bulkReader.getLength(); i++){
    	    	 token = new StringTokenizer(rawData[i], ",");
    	    	 while (token.hasMoreTokens()){
    	    		 System.out.println("Element # " + i + " Date is " + parsedData[i].getDate() + " Time is " + parsedData[i].getTime());
    class myObject {
    	 private String date;
    	 private String time;
    	 //Variable set 
    	 public void setDate(String inputDate){
    		 date = inputDate;
    	 public void setTime(String inputTime){
    		 time = inputTime;
    	//Variable get
    	 public String getDate(){
    		 return date;
    	 public String getTime(){
    		 return time;
    Last edited by helloworld922; April 20th, 2010 at 07:37 PM.

  2. #2
    Junior Member
    Join Date
    Mar 2010
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    Default Re: NullPointerException when trying to read Strings into an array of myObject

    Did you overload subscript [] operator for your own class??
    If not, then try it and i hope you will get that working. Thanks

  3. #3
    Administrator copeg's Avatar
    Join Date
    Oct 2009
    Thanked 832 Times in 772 Posts
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    Default Re: NullPointerException when trying to read Strings into an array of myObject

    You created an array of 'myObject', but never instantiate the objects of that array. You can do so as you loop through the 'bulkReader.length()':

    myObject[i] = new myObject();

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