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
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