An annotation on a constructor that shows how the parameters of
that constructor correspond to the constructed object's getter
methods. For example:
public class Point {
@ConstructorProperties({"x", "y"})
public Point(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
private final int x, y;
}
The annotation shows that the first parameter of the constructor
can be retrieved with the
getX()
method and the second with
the
getY()
method. Since parameter names are not in
general available at runtime, without the annotation there would be
no way to know whether the parameters correspond to
getX()
and
getY()
or the other way around.