KwickClips Java · 43 sec · free
Whose method runs: the variable's or the object's?
Short answer. The object's, decided at run time.
What is this called?
Dynamic method dispatch, or run time polymorphism.
Remember
| Object type decides the method |
| Chosen at run time |
| Called dynamic dispatch |
A Bird variable holds a Crow. Whose sound plays? Crow overrides sound. At run time, Java checks the real object, a Crow. So Caw caw prints. Remember. The object decides the method. It is chosen at run time. This is dynamic dispatch.
This clip is from the full lesson: Abstract Classes, Interfaces and Polymorphism — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 10 Computer Applications, ISC Class 12 Computer Science (868)
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