Top Pages. Simple Class Example Program In C Simple Program for Multiple Inheritance Using C Programming Simple Program for Binary Operator Overloading Using. Java OOPs Interview questions OOPs concept in java. PS If you like the page or have any questions, feel free to comment at end of the page. Q What are different oops concept in java Ans OOPs stands for Object Oriented Programming. The concepts in oops are similar to any other programming languages. Java Sorting Algorithms. A sorting algorithm is an algorithm that puts elements of a list in a certain order. Bugsy Malone Movie'>Bugsy Malone Movie. The mostused orders are numerical order and. Interface in Java Interface is used for achieving full abstraction in java. An interface is like a template that we can use in our classes. Introduction to Java programming. This tutorial explains the installation and usage of the Java programming language. It also contains examples for standard. OOPs concepts explained with examples in java. OOPs interview questions on inheritance, polymorphism, composition. Most good designers avoid implementation inheritance the extends relationship like the plague. As much as 80 percent of your code should be written entirely in. Java Tutorial or Learn Java or Core Java Tutorial or Java Programming Tutorials for beginners and professionals with core concepts and examples covers the basics and. Inheritance Programs In Java' title='Inheritance Programs In Java' />Basically, it is program agnostic. The different OOps concepts are. Q1 What is polymorphism Ans The ability to identify a function to run is called Polymorphism. In java, c there are two types of polymorphism compile time polymorphism overloading and runtime polymorphism overriding. Method overriding Overriding occurs when a class method in a child class has the same name and signature as a method in the parent class. When you override methods, JVM determines the proper method to call at the programs run time, not at the compile time. Overloading Overloading is determined at the compile time. It occurs when several methods have same names with Different method signature and different number or type of parameters. Same method signature but the different number of parameters. Same method signature and same number of parameters but of different type. Example of Overloading. Book. Details. String title. BookString title. OOP.png]];var lpix_1=pix_1.length;var p1_0= [[557' alt='Inheritance Programs In Java' title='Inheritance Programs In Java' />Java interview questions and answers for freshers and experienced on applets, sockets, JDBC, JSP, J2EE JNI, Servets etc., Java interview questions pdf, Java online. Core Java Interview Questions and Answers for Beginner, Advanced Experienced programmers from my 10 years of java programming and interviewing experience. Inheritance in java, Java inheritance example, inheritance in java with example programs, java inheritance program, extends keyword, subclass, superclass. Science. Book extends Book. Details. set. BookString title overriding. BookString title, String publisher,float price overloading. Q2 What is inheritance Ans Inheritance allows a Child class to inherit properties from its parent class. In Java this is achieved by using extends keyword. Best Software For Scanning Slides With A Digital Camera there. Only properties with access modifier public and protected can be accessed in child class. Parent. public String parent. Name. public String family. Name. protected void print. My. Name. System. My name is chid. Name family. Name. public class Child extends Parent. String child. Name. Age. inheritance. My. Name. System. My child name is chid. Name family. Name. In a example above the child has inherited its family name from the parent class just by inheriting the class. When a child object is created the method print. My. Name present in the child class is called. Q3 What is multiple inheritance and does java support Ans If a child class inherits the property from multiple classes is known as multiple inheritance. Java does not allow to extend multiple classes. The problem with the multiple inheritance is that if multiple parent classes have methods with same name, then at runtime it becomes difficult for the compiler to decide which method to execute from the child class. To overcome this problem java allows to implement multiple Interfaces. The problem is commonly referred as What is Diamond Problem. Q What is the difference between polymorphism and inheritanceInheritance defines parent child relationship between two classes, polymorphism takes advantage of that relationship to add dynamic behavior in your code. Inheritance encourages code reusability by allowing child class to inherit behavior from the parent class. On the other hand Polymorphism allows child to redefine already defined behaviour inside the parent class. Without Polymorphism its not possible for a child to execute its own behaviour while represented by a Parent reference variable, but with Polymorphism it can be done. Java doesnt allow multiple inheritance of classes, but allows multiple inheritance of Interface, which is actually required to implement Polymorphism. For example, a class can be Runnable, Comparator and Serializable at the same time because all three are interfaces. This makes them pass around in code e. Serializable, or to Collections. Comparator. Both Polymorphism and Inheritance allow Object oriented programs to evolve. For example, by using Inheritance you can define new user types in an Authentication System and by using Polymorphism you can take advantage of already written authentication code. Since, Inheritance guarantees minimum base class behaviour, a method depending upon super class or super interface can still accept an object of the base class and can authenticate it. Q4 What is an abstraction Ans Abstraction is a way of converting real world objects in terms of class. Its a concept of defining an idea in terms of classes or interface. For example creating a class Vehicle and injecting properties into it. E. gpublic class Vehicle. String colour. public String model. Q5 What is Encapsulation Ans The encapsulation is achieved by combining the methods and attribute into a class. The class acts like a container encapsulating the properties. The users are exposed mainly public methods. The idea behind is to hide how things work and just exposing the requests a user can do. Q6 What is Association Ans Association is a relationship where all object have their own lifecycle and there is no owner. Lets take an example of Teacher and Student. Multiple students can associate with a single teacher and single student can associate with multiple teachers but there is no ownership between the objects and both have their own lifecycle. Both can create and delete independently. Q7 What is AggregationAns Aggregation is a specialized form of Association where all objects have their own lifecycle but there is ownership and child object can not belongs to another parent object. Lets take an example of Department and teacher. A single teacher cannot belong to multiple departments, but if we delete the department teacher object will not destroy. We can think about has a relationship. Q8 What is CompositionAns Composition is specialized form of Aggregation and we can call this as a death relationship. It is a strong type of Aggregation. Child object does not have their lifecycle and if parent object deletes all child object will also be deleted. Lets take again an example of a relationship between House and rooms. House can contain multiple rooms there is no independent life of room and any room can not belongs to two different house if we delete the house room will automatically delete.