New to Java

Hi,

I'm working with an arraylist, PO (private ArrayList <Book> myPO;). It contains a number of isbn values and my goal is to sort them in descending order.

This is how I'm doing it now:

public void isbnsort()
    {
        ArrayList temp = new ArrayList<Book>();
        temp = myPO;
        int counter = 0;
 
		for(int i=0; i<myPO.size()-1; i++)
		{
			for(int k=0; i<myPO.size()-1; k++)
			{
	
				if(myPO.get(i).value()>=myPO.get(k).value())
                counter++;
			}
      
			if(counter == myPO.size())
			{
				temp.add(myPO.get(i));
				myPO.remove(i);
				i = 0;
			}
		}
 
		myPO = temp;
	}

I don't know if this is the right way to do it, but there has to be an easier/more efficient way than this, I think. I would appreciate any help on how to do this in a better manner.

Sorry if I've made any silly errors here.

Thanks.