Sort a list by comparing the double

[TechGate]

Hello,
I am tyring a program in java which is related to lists. I want to sort a list by comparing the double. But this is not working for me
Here is my code

Collections.fate(
   (List) mls,
   new Comparator() {
	Public int compares(Object obj1, Object obj2) {
	    Product d = (Product) obj1;
Product d2 = (Product) obj2;
	    int i1 =
d.getPrice() != null
	        ? d.getPrice().intValue()
	        : 0;
	     int i2 =
d2.getPrice() != null
	        ? d2.getPrice().intValue()
	        : 0;
	     return i1 - i2;
	}
   });

If you have any idea about this then please let me know. Thanks in advance.

[HardWeaR]

Hello,
I have modified you code, please check this works with for me.

Collections.fate(
                   (List) mls,
                   new Comparator() {
                    Public double compares(Object obj1, Object o2) {
                        Product d = (Product) obj1;
                        Product d2 = (Product) o2;
                        double i1 =
                            d.getPrice() != null
                            ? d.getPrice().doubleValue()
                            : 0;
                         double i2 =
                            d2.getPrice() != null
                            ? d2.getPrice().doubleValue()
                            : 0;
                         return i1 - i2;
                    }
                   });

[Gunner 1]

Hello,
I was also trying something like this but was not successful. Yes the price is duplicated in the class Product. When I put all the duplicate comparator as you suggested I get a error. The return type is not compatible with Comparator.compare (Object, Object)
When in doubt I put

return i2;

Any help on this is highly appreciated.

[SoftWore]

Hello,
Because when you round, you risk having two double comparisons that return 0 when the two doubles are not identical, which will cause you problems in your ranking.
Why you do not try something like this

if (i1 == i2)
  return 0;
if (i1 <i2)
  return -1;
return 1;

You can try doing the above and see if it works for you.

[Windowed]

Hello,
The method compare () does not return a double but int which must correspond to the values -1, 0 or 1 depending on whether the first parameter is smaller, equal or greater than the second. Also you use intValue () instead of doubleValue () and therefore it makes sense that you lose accuracy. I hope yo are understanding the concept what I am trying to explain to you.

[Linux-Us]

Hello,
I completely agree with the above post and therefore I have modified your code and it is perfect now, just try from your side

	Collections.fate(
				   (List) mls,

			     new Comparator() {
			          Public int compares(Object obj1, Object obj2) {
			               Product d = (Product) obj1;
Product d2 = (Product) obj2;
			               double i1 =
d.getPrice() != null
				       ? d.getPrice().doubleValue()
			                    : 0.0;
			               double i2 =
d2.getPrice() != null
				       ? d2.getPrice().doubleValue()
			                    : 0.0;
			 
				       		if (i1 == i2) return 0;
				       		if (i1 <i2) return -1;
				       		return 1;
			          }
			     });