Found my answer here: http://groups.google.com/group/google-web-toolkit/browse_thread/thread/f44e5874eb20b41b/f34caf3a7bf64daa
Simply hash the Double.toString() . Anyone has a better idea? On Mar 31, 2:53 pm, googelybear <[email protected]> wrote: > It seems that this got reverted at some > point:http://code.google.com/p/google-web-toolkit/source/diff?spec=svn2434&;... > > does anyone know why? > > On Mar 31, 2:35 pm, googelybear <[email protected]> wrote: > > > > > I just found a post in the gwt contributors group but I cannot find it > > anywhere in gwt, any > > ideas?http://groups.google.com/group/google-web-toolkit-contributors/browse... > > > On Mar 31, 2:20 pm, googelybear <[email protected]> wrote: > > > > Hi, > > > > this question might seem stupid but how can one implement hashCode() > > > and equals() for a simple 2d point class as follows: > > > > public class Point { > > > > private double fX; > > > > private double fY; > > > > public double getX() { > > > return fX; > > > } > > > > public void setX(double x) { > > > this.fX= x; > > > } > > > > public double getY() { > > > return fY; > > > } > > > > public void setY(double y) { > > > this.fY= y; > > > } > > > > } > > > > The generated equals() and hashCode() methods from Eclipse do NOT work > > > with GWT as method Double.doubleToLongBits() is missing: > > > > @Override > > > public int hashCode() { > > > final int prime= 31; > > > int result= 1; > > > long temp; > > > temp= Double.doubleToLongBits(fX); > > > result= prime * result + (int) (temp ^ (temp >>> 32)); > > > temp= Double.doubleToLongBits(fY); > > > result= prime * result + (int) (temp ^ (temp >>> 32)); > > > return result; > > > } > > > > @Override > > > public boolean equals(Object obj) { > > > if (this == obj) > > > return true; > > > if (obj == null) > > > return false; > > > if (!(obj instanceof Point)) > > > return false; > > > Point other= (Point) obj; > > > if (Double.doubleToLongBits(fX) != > > > Double.doubleToLongBits(other.fX)) > > > return false; > > > if (Double.doubleToLongBits(fY) != > > > Double.doubleToLongBits(other.fY)) > > > return false; > > > return true; > > > } > > > > Does anyone have an idea how to implement this? > > > > thanks a bunch, > > > > Dennis -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
