![]() ![]() Note that details differ among languages. You can do that assignment because a Student is a Person, but the runtime is smart enough to know that the actual type of p is Student. It gets a bit tricky, but if you do something like Person p = new Student() If you have a Person, which has a read method, and you have a Student which extends Person, which has its own implementation of read, which method gets called is determined for you by the runtime, depending if you have a Person or a Student. ![]() Polymorphism deals with how the program decides which methods it should use, depending on what type of thing it has. For example, if you have a private field on Person, Student won't see it because its private, and private fields are not visible to subclasses. There are some details around the access modifiers you put on the fields/methods in Person, but that's the basic idea. So if you have a Person class, then you have a Student class that extends Person, Student inherits all the things that Person has. Other examples of compile time polymorphism are constructor overloading and method hiding.ĩ.Inheritance is when a 'class' derives from an existing 'class'. How to achieve or implement static polymorphism in Java?Īns: Static polymorphism can be achieved by method overloading. In static polymorphism, the behavior of method is decided at compile-time based on the parameters or arguments of method.Ĩ. What is Compile time polymorphism (Static polymorphism)?Īns: A polymorphism where object binding with methods happens at compile time is called static polymorphism or compile-time polymorphism. Without polymorphism, it is not possible for a child class to execute its own behavior.ħ. On the other hand, polymorphism enables child class to redefine already defined behavior inside parent class. Inheritance helps in code reusability in child class by inheriting behavior from parent class. What are the advantages of Polymorphism?Īns: There are the following advantages of polymorphism in java:ī. How is Inheritance useful to achieve Polymorphism in Java?Īns: Inheritance represents the parent-child relationship between two classes and polymorphism take the advantage of that relationship to add dynamic behavior in the code (or to make the program more dynamic).ĥ. The subclasses can have their own unique implementation for certain features and can also share some of the functionality through inheritance.Ĥ. ![]() What are different ways to achieve or implement polymorphism in Java?Īns: Polymorphism in Java can be primarily achieved by subclassing or by implementing an interface. ![]() Dynamic polymorphism (Runtime Polymorphism)ģ.Static polymorphism (Compile time Polymorphism).What are the types of Polymorphism in Java?Īns: There are two types of polymorphism in java. In other words, if a single object shows multiple forms or multiple behaviors, it is called polymorphism.Ģ. That is, when a single entity (object) behaves differently in different cases, it is called polymorphism. Polymorphism is a concept by which we can perform a single task in different ways. That is one thing that can take many forms. Polymorphism means “many forms” in Greek. Java Polymorphism Interview Questions and AnswersĪns: Polymorphism in java is one of the core concepts of object-oriented programming system. So, prepare the answers of these questions before going to any technical interviews. These Java polymorphism interview questions have also covered the simple as well as tricky coding questions for the best practice so that you are able to answers of questions asked by the interviewer in any company. Here, we have listed the top 32 interview questions on Polymorphism in Java with the best possible answers. ![]()
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