Multiple Inheritance Troubles

Java-Extend Interface

Extend Interface Interface is also extended by other Interface. One Interface can inherit another by use of the keyword extends. This is much like a way for inheriting class. When you inheriting two interfaces, you must provide implementations for all methods defined within the interface inheritance path. In the following program, the interfaces InterOne and … Read more…

nested interfece

Java-Nested Interfaces

Nested Interfaces An interface can be declared a member of a class or another interface. Such an interface is called a member interface or a nested interface. A nested interface can be declared as public, private, or protected. When a nested interface is used outside of its enclosing scope, it must be qualified by the … Read more…

Accessing Implementations Through Interface References

Java-Accessing Implementations Through Interface References

Accessing Implementations Through Interface References You can declare variables as object references that use an interface rather than a class type. Any instance of any class that implements the declared interface can be referred to by such a variable. When you call a method through one of these references, the correct version will be called … Read more…

Interface Variables must be Final

Java-Interface Variables must be Final

Interface Variables must be Final An interface does not have instance variables. The members of an interface are always declared as static and final, that the variable cannot be modified by the methods in the class. Such variables will be inherited by the class that implements the interface. Program Program Source interface Data { int … Read more…

implementing-interfaces

Java-Interface

Interface An interface declares a set of methods and their signatures. The methods that are declared in an interface should not have implementation codes. A class that makes use of an interface should provide the codes for the methods declared in that interface. An interface is similar to a class, but there are several important differences … Read more…