The Ball Class:

The data that defines a ball is given below:
x:	its x position
y:	its y position
r:	its radius
dx:	its speed in the x direction
dy:	its speed in the y direction


a. What is a constructor?
[2]

Write two constructors for this class:

one that has no default values;

my lecturers answer:

  Ball ( int xx, int yy, int rr, float dx, float dy)
{
  this.x = xx;
  this.y = yy;
  this.r = rr;
  this.dx =  dx;
  this.dy = y;
}