Re: Sorting a Vector...

[furgalj@xxxxxxxxxxxxxxxx]

You really need to adopt the OO approach and define your IRGPerf class to 
implement the Comparator interface. Just declare your class as 

class IRGPerf implements Comparator {...

Then, somewhere in your IRGPerf class you declare and equals and a compare 
method. So for your case you would have something like:

public int compare(Object obj1, Object obj2) {
        if (!(obj1 instanceof IRGPerf)) {
                return 0; // Leave unknown object alone, or throw an 
exception here
        }
        if (!(obj2 instanceof IRGPerf)) {
                return 0; // Leave unknown object alone, or throw an 
exception here
        }
        IRGPerf irgPerf1 = (IRGPerf)obj1;
        IRGPerf irgPerf2 = (IRGPerf)obj2;

        if (irgPerf1.strNbr > irgPerf2.strNbr) {
                return 1;
        } else if (irgPerf1.strNbr == irgPerf2.strNbr) {
                return 0;
        } else (irgPerf1.strNbr > irgPerf2.strNbr) {
                return -1;
        }
}

Note: if you don't like the multiple return style, just change this to use 
a local result variable.

public boolean equals(Object object) {
        if (!(object instanceof IRGPerf)) {
                return false; // Obviously a comparision of an unknown 
object should fail
        }

        IRGPerf anIRGPerf = (IRGPerf)object;
        return (this.strNbr == anIRGPerf.strNbr);
}

Feel free to yell at me for any syntax or procedural errors. 

Then, where you need it, use a ListArray instead of a Vector (or convert 
it). Then just code:

Collections.sort(yourList);

It's that simple! Your Comparator methods in the IRGPerf class will be 
called to compare the internal object values.

I have similar code to this which sorts fairly large lists inside of a 
GUI. Even on an average system the Java Collections sort method has sorted 
lists of 10,000 in a second or less.


Jeff Furgal
Product Architect
Lakeview Technology, Inc.

"Premature optimization is the root of all evil" - Donald Knuth