What is Diamond problem and how is it resolved in Java?
Solution to diamond problem
You can achieve multiple inheritance in Java, using the default methods (Java8) and interfaces. From Java8 on wards default methods are introduced in an interface. Unlike other abstract methods these are the methods of an interface with a default implementation.
What is Diamond problem in inheritance how Java 8 solves this problem?
How to avoid Diamond Problem With Default Methods in Java 8. In order to solve this error, you need to override the write() method in your implementation class i.e. class Multitalented here, this will remove the ambiguity, making the compiler happy enough to compile this class.
What is Diamond ambiguity in Java?
Then, if you call the demo() method using the object of the subclass compiler faces an ambiguous situation not knowing which method to call. This issue is known as diamond problem in Java. Due to this Java does not support multiple inheritance i.e., you cannot extend more than one other class.
What is diamond operator in Java?
Diamond Operator: Diamond operator was introduced in Java 7 as a new feature. The main purpose of the diamond operator is to simplify the use of generics when creating an object. It avoids unchecked warnings in a program and makes the program more readable.
What is Upcasting and Downcasting in Java?
Upcasting: Upcasting is the typecasting of a child object to a parent object. … Instead of all the members, we can access some specified members of the child class. For instance, we can access the overridden methods. Downcasting: Similarly, downcasting means the typecasting of a parent object to a child object.
What is encapsulation in Java?
Encapsulation in Java is a mechanism of wrapping the data (variables) and code acting on the data (methods) together as a single unit. In encapsulation, the variables of a class will be hidden from other classes, and can be accessed only through the methods of their current class.
Why do we use super in Java?
The super keyword in Java is a reference variable which is used to refer immediate parent class object. Whenever you create the instance of subclass, an instance of parent class is created implicitly which is referred by super reference variable. … super can be used to invoke immediate parent class method.
What is interface used for in Java?
An interface in Java is a mechanism which we mainly use to achieve abstraction and multiple inheritances in Java. An interface provides a set of specifications that other classes must implement. We can implement multiple Java Interfaces by a Java class. All methods of an interface are implicitly public and abstract.
What do you mean by polymorphism in Java?
Polymorphism in Java is the ability of an object to take many forms. To simply put, polymorphism in java allows us to perform the same action in many different ways. … In the technical world, polymorphism in java allows one to do multiple implementations by defining one interface.
Which type of inheritance leads to diamond problem *?
Which type of inheritance leads to diamond problem? Explanation: When 2 or more classes inherit the same class using multiple inheritance and then one more class inherits those two base classes, we get a diamond like structure.
What is the difference between collections and collection in Java?
It defines several utility methods like sorting and searching which is used to operate on collection. It has all static methods.
Collection vs Collections in Java with Example.
|The Collection is an interface that contains a static method since java8. The Interface can also contain abstract and default methods.||It contains only static methods.|
Why does diamond problem arises due to multiple inheritance Mcq?
Explanation: The diamond problem arises when multiple inheritance is used. This problem arises because the same name member functions get derived into a single class. … At least 2 base classes and one class to inherit those two classes. If lesser, it becomes single level inheritance.