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i nstanceof

i nstanceof. x instanceof Y returns true if object x is an instance of class Y Example (but better example on next panel) public void moveTo (Point2D point) { if (point instanceof Point2D.Double) { // do stuff that relies on double-precision accuracy } else {

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i nstanceof

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  1. instanceof • x instanceof Y • returns true if object x is an instance of class Y • Example (but better example on next panel) public void moveTo(Point2D point) { if (point instanceof Point2D.Double) { // do stuff that relies on double-precision accuracy } else { // only rely on single-precision accuracy } }

  2. Casting • Example: public Dud(BallEnvironment be) { if (be instanceofWorld) { ((World) (be)).STUFF_THAT_WORLDS_CAN_DO... } } • Note weird notation: (Class) (thing-to-cast) • You will need this notation for implementing equals in BigRational

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