This pattern is useful when you wish to limit the production of several objects in order to save resources or ensure consistency in data sharing throughout the application. This is accomplished by managing the procedure and making sure there is only one single global point of access to that particular instance. What is the Singleton design pattern?Īns: The Singleton design pattern is a software design approach that guarantees a class has just one instance throughout the program's execution. These types of java OOPs interview questions and answers should be prepared by the candidates thoroughly.Īlso Read: Top Java bootcamp courses to pursue right now! Is there a private constructor in Java?Īns: Private constructors are often used in the Singleton design pattern to restrict object creation to only within the class. It is primarily used to differentiate between instance variables and method parameters that have the same name. What is the purpose of the “this” keyword in Java?Īns: The “this” keyword in Java is used to refer to the current instance of a class. Java does not have destructors like some other programming languages instead, it relies on garbage collection to manage memory. What are constructor and destructor in Java?Īns: In Java, constructors are special methods used to initialise objects. This is amongst the most asked OOPs interview questions for experienced professionals. Can you create an instance of an abstract class in Java?Īns: No, it cannot be created as an instance of an abstract class directly because abstract classes are incomplete and need to be extended by concrete subclasses. By limiting visibility to only the code components included in its package, it offers a certain amount of encapsulation, improving code organisation and security. What is the default access modifier in Java?Īns: The default access modifier, also known as package-private, allows access to classes, methods, and variables within the package but prohibits access from outside of that package. This kind of OOPs interview questions for freshers must be in your preparation list. Access modifiers (e.g., public, private, protected, and default) control the visibility of classes, methods, and variables in Java. They are essential in regulating the degree of access and isolation of programme elements. This Java OOPs interview question must be included in your preparation list.Īlso Read: Top 15+ courses on C programming for beginnersĪns: Java access modifiers are keywords that control a programme's classes, methods, and variables' visibility and accessibility. This is one of the basic OOPs interview questions for experienced individuals as well as freshers to prepare for.Īns: Method overriding is a feature in Java where a subclass provides a specific implementation for a method that is already defined in its superclass, using the same method signature. Method overloading is having multiple methods with the same name but different parameters, and method overriding is providing a specific implementation for a method in a subclass that is already defined in its superclass.Īns: Method overloading is a feature in Java where multiple methods in the same class can have the same name but different parameter lists (number or types of parameters). How is polymorphism achieved in Java?Īns: Polymorphism in Java is achieved through method overloading and method overriding. A class can implement multiple interfaces, but it can extend only one abstract class.Īlso Read: 20+ Courses to Learn Backend Development in NodeJS An abstract class can have both abstract and concrete methods and have instance variables, while an interface can only have abstract methods and constants. What is the difference between interface and abstract class?Īns: To ace your OOPs interview, you must prepare for this best Java OOPs interview question. It promotes code reuse and supports the "is-a" relationship. Abstract classes and interfaces are used to achieve abstraction in Java.Īns: Inheritance is a mechanism in Java where a class (subclass/derived class) can acquire the properties and behaviours of another class (superclass/base class). Encapsulation is achieved in OOP by making data members private and providing public methods (getters and setters) to access and modify the data.Īns: Abstraction is the process of hiding the implementation details of an object and exposing only the relevant features to the outside world. How is encapsulation achieved in OOP?Īns: This is amongst the top OOPs interview questions and answers for freshers. Simpliv Learning Java Certification Courses Microsoft Corporation Java Certification CoursesĪmazon Web Services Java Certification Courses Great Learning Java Certification Courses
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