How to use Comparator class to an object's data tag that is double?

Question

I want to order my vector with full of myClass its like:

class MyClass
{

double distance;
String name;

 public void MyClass()
 {}

}

And then my vector is about:

MyVector<MyClass>myVector = new MyVector<MyClass>();

MyVector.add(myClass1);
MyVector.add(myClass2);
MyVector.add(myClass3);
//Etc....

I want to order my vector's elements by the distance data tag. I tryed to use comparator class but i failed, please someone can implement me a comparator class that is work for this case ?

Answer 1

Is this how you did it? Well, note that there are a few changes.

List<MyClass> myVector = new Vector<MyClass>();

myVector.add(myClass1);
myVector.add(myClass2);
myVector.add(myclass3);


Collections.sort(myVector, new Comparator<MyClass>() {
    public int compare(MyClass one, MyClass two) {
        return Double.valueOf(one.getDistance()).compareTo(two.getDistance());
    }
});

1. Use a List on the left hand side of the assignment as you should always program against interfaces.
2. I have added getter and setter methods to your MyClass.

The other option, however, is to make your class Comparable.

class MyClass implements Comparable<MyClass> {
    private double distance;
    private String name;

    @Override
    public int compareTo(MyClass other) {
        return Double.valueOf(this.distance).compareTo(other.distance);
    }

    ...
    getters and setters
    ...
}

Then you could simply write Collections.sort(myVector).