10 Questions
What is an interface in Java?
A collection of related abstract public methods
Which keyword is used to create and define an interface in Java?
interface
What is true about methods and constants in interfaces in Java?
They are implicitly public
Can an interface be instantiated directly in Java?
No, interfaces cannot be instantiated directly
What is true about inheriting an interface in Java?
An interface that extends another interface inherits all abstract methods
What is an interface in Java?
A collection of related abstract public methods
How are methods and constants in interfaces treated in Java?
Methods and constants in interfaces are implicitly public, and constants are also static and final
Which of the following is true about inheriting an interface in Java?
An interface that extends another interface or an abstract class that implements an interface inherits all abstract methods
What is the rule for defining an interface in Java?
An interface cannot be marked as final
How many interfaces can a class implement in Java?
Two or more interfaces
Study Notes
Interfaces in Java
- An interface in Java is a collection of abstract methods and constants that can be implemented by a class.
- The keyword
interfaceis used to create and define an interface in Java.
Methods and Constants in Interfaces
- Methods in interfaces are implicitly abstract and public, and constants are implicitly public, static, and final.
- Methods and constants in interfaces are treated as abstract methods and public static final constants.
Instantiating an Interface
- An interface cannot be instantiated directly in Java.
Inheriting an Interface
- A class can implement multiple interfaces in Java.
- When a class inherits an interface, it must implement all the methods of the interface.
- A class can implement multiple interfaces and inherit their methods and constants.
Defining an Interface
- The rule for defining an interface in Java is to declare all methods as abstract and all variables as constants.
Implementing Multiple Interfaces
- A class can implement any number of interfaces in Java.
Test your knowledge of Java interfaces with this quiz! Explore the fundamentals, rules for defining and inheriting interfaces, and practical examples to solidify your understanding.
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