import java.util.*;

class DoubleArrayList 
{
    public static void main(String[] args) 
    {
        ArrayList<Double> al = new ArrayList<Double>();
        
        // print empty list
        System.out.println(al);
        
        // add some objects
        al.add(new Double(4.321));
        al.add(3.321); 				//AUTOBOXING!
        al.add(new Double(2.321));
        al.add(1.321);				//AUTOBOXING!
        System.out.println(al);
        
        // sort it
        // (Can't use Arrays.sort: not an array)
        Collections.sort(al);
        System.out.println(al);

        // delete an element
        al.remove(2);
        System.out.println(al);
        
        Double d = al.get(0);
        System.out.println(d);
        
        System.out.println("Sum: " + sum(al));
    }
    
    private static double sum(ArrayList<Double> dal)
    {
	    double temp=0;
	    for(int i=0; i<dal.size(); i++)
	    	temp += dal.get(i).doubleValue();
	    return temp;
    }
}