KwickClips Java · 41 sec · free
What is an interface?
Short answer. A list of methods a class promises to have, like a contract.
Why must the method be public?
Interface methods are public, and a class cannot make them less visible.
Remember
| Interface: a contract |
| Class uses implements |
| Methods must be public |
Three ways to pay. How does Java force all of them to pay? An interface is a contract. Upi implements Pay, so it must write a public pay method. Remember. An interface is a contract. A class implements it. Its methods must be public.
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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