Sotring an array of BPM Objects

Question

Hi
I need to sort an array of BPM objects in my PBL code. I tried using Java.Util.Comparator class for this but somehow, it is not working.
Here is what I tried,
I created a subclass of Java.Util.Comparator class (Type inheritance) called MyComparator and created the compare method under it for comparing MyObject objects.
I use following code,
MyObject[] ttt;
ttt[0] = new MyObject();
ttt.clear();// this I use to initialize otherwise the extend method throws error.
ttt.extend(arg1: "abcd", arg2=23.2);
ttt.extend(arg1: "xyz", arg2=13.2);
Arrays.sort(arg1 : ttt, arg2 : new MyComparator());
I would expect this code should sort the arra ttt as per the comparison logic in the MyComparator. The code executes the compare method properly, but somehow the ttt arra remains unchanged.
Has anyone faced similar issue? any help would be appreciated.

Answer 1

Thanks Dan for the solution.
But my requirement is bit more complicated.
I need to sort the array dynamically based on different fields.
e.g. Lets say the object contains 4 attributes - att1,att2,att3,att4.
I need to sort the same array dynamically on any of these attributes. at one place I may want to sort on att1, while at other place I may need the array sorted on att3.
The Java.Util.Comparator provides me this flexibility, but somehow it doesnt work.
Is there any other alternative?
Setting the primary key for the BPM object would not help this dynamic behaviour. Can we change the primary key settings at runtime and then call the sort method?
I feel the reaso for Java.Util.Comparator not working may be because the PBL does not pass parameters by reference, instead it passes parameter by value, thats why the code "Arrays.sort(arg1 : ttt, arg2 : new MyComparator());" does not change the contents/order of the input array ttt. Is there any way we can eforce parameter passing by reference in PBL?