Array of Objects

[bluefloyd8]

Hey All!

I need to make an array of objects ( of a class i created). I

Below is some of the code. I want to make an array, parsedInfo, of objects from the class ParsedSiteInfo. In a function not shown, I have a for-loop that calls the function createNewSite(). So the array needs to be able to grow dynamically.

Code:

     private ParsedSiteInfo[] parsedInfo;
     private int sites = 0;
     
     private void createNewSite() 
    	 parsedInfo[sites] = new ParsedSiteInfo();
    	 sites++;
     }

I ran this code with some debug print statements and determine the program as a problem with this line:

Code:

parsedInfo[sites] = new ParsedSiteInfo();

[bluefloyd8]

I just tried the following code as a change. I wasnt putting "this" in front of variables. My code shown is part of a class ( public class ExampleHandler extends DefaultHandler{ )

Code:

     private ParsedSiteInfo[] parsedInfo;
     private int sites = 0;

     private void createNewSite() {
    	 this.parsedInfo[this.sites] = new ParsedSiteInfo();
    	 this.sites++;
     }

Still doesnt work

[tim]

Hello bluefloyd8

Arrays are not dynamic data structures and you cannot make them (that easily). You need to specify their size before you use them. Your compiler probably gave you a null pointer exception, right? So change you code to:

Code:

     public static final int structureSizeLimit = 10000;
     private ParsedSiteInfo[] parsedInfo = new ParsedSiteInfo[structureSizeLimit];
     private int sites = 0;

     private void createNewSite() {
    	 this.parsedInfo[this.sites] = new ParsedSiteInfo();
    	 this.sites++;
     }

Remember to check this limit each time you try to add elements. See this tutorial on vectors and other dynamic data structures.

Good luck.

[praveena]

is it necessary to use arrays in your code ...
You can still use LinkedList

[XiaoXiao]

Hello bluefloyd8

Array is not a dynamic data structures.
Instead of using an Array ... u can use ArrayList which is dynamic .. u dont have to worry about the size increment .. tht will be taken care.
This should work for you .......


ArrayList<ParsedSiteInfo> parsedInfo = new ArrayList<ParsedSiteInfo>();
private void createNewSite(){
this.parsedInfo.add(new ParsedSiteInfo());
}

[bluefloyd8]

Cool guys, thanks. Ill look into using the ArrayList. I needs to be dynamic because memory management is important.