PPT Slide

Keyword instanceof: Used to interogate an object to see if it is an instance  of the specified class, e.g.

“Is this particular animal of class Dog?”

Casting … Why?

Question:

If Java can determine that a given Animal is or is not a Dog (via instanceof), then:

• Why the need to cast it to a Dog object before Java can recognize that it can bark?

• Why can’t Java do it for us?

Previous slide

Next slide

Back to first slide

View graphic version