Hello
Why can't I call a method with signature
doSomething(Collection<Point> points)

with an argument ArrayList<MyPoint>  (where MyPoint extends Point and
ArrayList implements Collection)?

How should I work around this?

Thank you for your answers
Philipp

Example code:

== Test.java ==
import java.awt.Point;
import java.util.ArrayList;
import java.util.Collection;

public class Test {
  public static void main(String[] args) {
    ArrayList<MyPoint> list = new ArrayList<MyPoint>();
    list.add(new MyPoint(1,2,5));   
    doSomething(list); // gives compile error
  }

  public static void doSomething(Collection<Point> points){
    for(Point p: points){
      System.out.println(p);
    }
  }
}

== MyPoint.java ==
import java.awt.Point;

public class MyPoint extends Point {
  public int height;
  public MyPoint(int i, int j, int height) {
    super(i,j);
    this.height = height;
  }
}