Inheritance is achieved by using the extends keyword. Inheritance in java is the process in which the child class(subclass) object acquires all the properties and behaviors of a parent object (superclass). No, you can not override a method declared as final. Q18 Can you override the method which is declared as final? No, you can not override a private method in java. Q17 Can we override a method declared as private in java? The concept of covariant return type was introduced in java 1.5 version. In the case of covariant method overriding, the return type must be the same as, or a subtype of, the return type declared in the original overridden method in the superclass. Q16 What do you mean by covariant method overriding in java? Static methods belong to class so they are resolved at compile time using the type of reference variable. No, you can not override a static method in java. Q15 Can we override a static method in java? A static method can be overloaded, but can not be overridden in java. Static methods should be accessed by class names rather than an object. You can have as many overloaded static methods having the same name as you like provided they have different method signatures. Yes, overloading a static method in java is possible. Q14 Can we overload a static method in java? Yes, we can override the overloaded method. Q13 Can we override the overloaded method in java? Method Overriding is an example of late binding in java. Method Overloading is an example of early binding in java. When an object is assigned to an object variable the compiler performs a process called binding.Ĭompile-time binding is called early binding (static binding) whereas runtime binding is called late Q12 What is early and late binding in java? I have explained in detail about the difference between Method Overloading and Method Overriding in java. Q11 What is the difference between Method Overloading and Method Overriding? You can find the complete detail about Method Overriding here. In Method Overriding a subclass/child class has the same method name, same method signature and same return types (covariant return types) as a method in its parent class, then the child class method has overridden the parent class method. When combined with the concepts of the Abstraction, Encapsulation, Inheritance, and Polymorphism give more power to the Object-Oriented Programming languages.Ī class with multiple methods by the same name but different parameters called Method Overloading. Reduces complexity and also improves the maintainability of the system. Q7 What are the 4 OOPs principles in java? Better Productivity as OOPs techniques enforce rules on a programmer. Objects can also be reused within and across applications, Reuse also enables faster development.Ĭ. Gives a clear modular structure for programsī. An object is a physical entity whereas Class is a logical entity.Ī. Class is a blueprint from which the instance/object is created.ī. Q5 Difference between a Class and an Object in java?Ī. Variables are also called members, fields or attributes. Functions are also called procedures or methods. This is where the data gets manipulated or algorithms get executed. State(instance variables): Values assigned to the instance variables of an object make up the object's state.īehavior(functions/methods): Methods/functions are where the class logic is stored. Q4 What do you understand by the terms state and behavior of an Object? Object: At runtime, when JVM (Java Virtual Machine) finds the new keyword, it will use the appropriate class to create an object which is an instance of that class. The two core concepts of OOPs are Object and Class.Ĭlass: Class is a template that explains the kind of state and behavior that objects of its type support. The state and behavior of an Object are represented as data members (variables) and methods (functions). It is a programming paradigm formulated around Objects. OOPs stands for Object-Oriented Programming System. In this post, I will be sharing most frequently asked 50 core java OOPs concepts interview questions and answers in java for freshers (0 - 1 year) and experienced.
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