Comparator with double type

Question

I have written the following code:

public class NewClass2 implements Comparator
{
    public int compare(Point p1, Point p2)
    {
        retur         


        

Answer 1

Use Double.compare(/**double value 1*/, /**double value 2*/); with a new Comparator for your model class double value.

public static List<MyModel> sortByDouble(List<MyModel> modelList) {
        Collections.sort(modelList, new Comparator<MyModel>() {
            @Override
            public int compare(MyModels1, MyModels2) {
                double s1Distance = Double.parseDouble(!TextUtils.isEmpty(s1.distance) ? s1.distance : "0");
                double s2Distance = Double.parseDouble(!TextUtils.isEmpty(s2.distance) ? s2.distance : "0");
                return Double.compare(s1Distance, s2Distance);
            }
        });
        return modelList;
    }

Answer 2

Well, you could multiply those double values by an appropriate factor before converting into integer, for eg. in your case since its only one decimal place so 10 would be a good factor;

return (int)(p1.getY()*10 - p2.getY()*10);

Answer 3

I just want to expand on Peter Lawrey answer on JDK 8, if you do it like this:

public class NewClass2 implements Comparator<Point> {
    public int compare(Point p1, Point p2) {
        return Double.compare(p1.getY(), p2.gety());
    }    
}

You could define this comparator using a lambda expression pretty easily

(Point p1,Point p2) -> Double.compare(p1.getY(), p2.gety())  

Better yet, you could use a member reference like this:

Double::compare

Answer 4

Double min  = Arrays.stream(myArray).min(Double::compare).get();