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- Question
In RDBMS, what is the efficient data structure used in the internal storage representation?
Options- A. Stack
- B. Queue
- C. B+ tree structure
- D. AVL tree Structure
- Correct Answer
- B+ tree structure
ExplanationB+ tree. Because in B+ tree, all the data is stored only in leaf nodes, that makes searching easier. This corresponds to the records that shall be stored in leaf nodes
- 1. What is Overloading Polymorphism? Discuss
- 2. If you are using C language to implement the heterogeneous linked list, what pointer type will you use? Discuss
- 3. How many types of classes are there in Java? Discuss
- 4. Which of the following modifiers can be used with Local inner class?
Options- A. Final or Abstract
- B. Final or Transcient
- C. Abstract or Transcient
- D. Final or public Discuss
- 5. A lock can be acquired on a class. The above statement is
Options- A. True
- B. False
- C. Both A and B
- D. None Discuss
- 6. What is JAR file? Discuss
- 7. What is polymorphism? Discuss
- 8. When do you use :: Operator in C++? Discuss
- 9. Explain Overriding Polymorphism.? Discuss
- 10. When should I use abstract classes and when should I use interfaces? Discuss
Technology problems
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Correct Answer: Overloading allows multiple functions to exist with same name but different parameters Again if you take bike as an example, it has a function “Start” with two forms ie ?Auto Start? and ?kick start?
Correct Answer: The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them It is not possible to use ordinary pointers for this So we go for void pointer Void pointer is capable of storing pointer to any type as it is a generic pointer type
Correct Answer: Two types of classes: 1) Top Level Class 2) Classes within Class i) member classes a) static member class b) non static member class ii) local classes iii) anonymous classes
Correct Answer: Final or Abstract
Explanation:
It can either be Final or Abstract
Correct Answer: True
Explanation:
A lock can be acquired on a class. This lock is acquired on the class's Class object.
Correct Answer: A JAR file (short for Java Archive) is a ZIP file used to distribute a set of Java classes It is used to store compiled Java classes and associated metadata that can constitute a program
Correct Answer: It is the ability of an object to behave differently on different situations for the same message
Correct Answer: :: is the scope resolution operator When local variable and global variable are having same name, local variable gets the priority C++ allows flexibility of accessing both the variables through a scope resolution operator
Correct Answer: Overriding means changing behavior of methods of base class in derive class by overriding the base class methods If class A is a base class with method ?calculate? and class B inherits class A, thus derives method ?calculate? of class A The behavior of ?calculate? in class B can be changed by overriding it
Correct Answer: Use Interfaces when? - You see that something in your design will change frequently - If various implementations only share method signatures then it is better to use Interfaces - You need some classes to use some methods which you don't want to be included in the class, then you go for the interface, which makes it easy to just implement and make use of the methods defined in the interface Use Abstract Class when? - If various implementations are of the same kind and use common behavior or status then abstract class is better to use - When you want to provide a generalized form of abstraction and leave the implementation task with the inheriting subclass - Abstract classes are an excellent way to create planned inheritance hierarchies They're also a good choice for nonleaf classes in class hierarchies
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