Sorting an ArrayList containing custom objects - sorting

Question

I want to sort an ArrayList of High scores. The list contains objects, which each contain String name, String category and int score. I want to sort the ArrayList into descending order by score:
This is what I have at the moment, however it crashes the program when the procedure runs:
**INITIALIZING ARRAY AND VARIABLES:**
private static ArrayList<HighScore> highScores = new ArrayList<HighScore>();
private static int Last;
private static int First = 0;
private static int PivotValue;
private static int LeftPointer;
private static int RightPointer;
private static int Pivot;
**READING IN VALUES INTO ARRAYLIST**
String File = "src/project/res/highscores.txt";
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(File));
while ((line = br.readLine()) != null) {
HighScore h = new HighScore(line);
highScores.add(h);
}
} catch (Exception e) {
System.out.println("Problem reading in high scores!");
}
**CALLING THE PROCEDURE**
quickSort(highScores,First,Last);
private static void quickSort(ArrayList<HighScore> highScores2, int first, int last){
if(first < last)
{
PivotValue = highScores2.get(first).getScore();
LeftPointer = first + 1;
RightPointer = last;
while((LeftPointer <= RightPointer))
{
while((LeftPointer <= RightPointer)&&(highScores2.get(LeftPointer).getScore() < PivotValue))
{
LeftPointer++;
}
while((highScores2.get(RightPointer).getScore() > PivotValue)&&(LeftPointer <= RightPointer))
{
RightPointer--;
}
if(LeftPointer < RightPointer)
{
HighScore temp = highScores2.get(LeftPointer);
highScores2.set(RightPointer, highScores2.get(LeftPointer));
temp.equals(highScores2.get(RightPointer));
}
}
Pivot = RightPointer;
HighScore temp = highScores2.get(first);
highScores2.set(Pivot,highScores2.get(first));
temp.equals(highScores2.get(Pivot));
quickSort(highScores2, first, Pivot-1);
quickSort(highScores2, Pivot + 1, last);
}
}