What is an interface How is extending a class different from impl.pdf
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An interface is an unimplemented class used to define a set of operations for creating new object types, containing only public static final variables and public abstract methods. The main difference between extending a class and implementing an interface is that a class can extend another class, while only a single class can implement an interface. This allows for multiple inheritance of implementations through interfaces.
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What is an interface How is extending a class different from impl.pdf
- 1. What is an interface ? How is extending a class different from implementing an interface ? Solution Interface :- Interface is also one type class; it is a fully un-implemented class. It is used for creating a new type of object only by declaring set of operations of this object. So interface contains only public static final variables and public abstract methods for declaring object operations. Interface is mainly introduced to develop multiple implementation inheritance. How is extending a class different from implementing an interface ? Because a class can extend an another class. But one and only a class implements an interface. Example :- Interface I1 { } Interface I2 { } class A { } class c extends A { } class c extends A implements I1,I2 { }