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- Question
How many types of classes are there in Java?
- 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
- 1. 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
- 2. 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
- 3. What are the various elements of OOPS? Discuss
- 4. What is the difference between throw and throws clause? Discuss
- 5. Which method names follow the JavaBeans standard?
Options- A. addSize
- B. putDimensions
- C. getCust
- D. deleteRep Discuss
- 6. If you are using C language to implement the heterogeneous linked list, what pointer type will you use? Discuss
- 7. What is Overloading Polymorphism? Discuss
- 8. 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 Discuss
- 9. What is JAR file? Discuss
- 10. What is polymorphism? Discuss
Technology problems
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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: Various elements of OOP are: ? Object ? Class ? Method ? Encapsulation ? Information Hiding ? Inheritance ? Polymorphism
Correct Answer: A throw is used to throw an exception manually, where as throws is used in the case of checked exceptions, to tell the compiler that we haven't handled the exception, so that the exception will be handled by the calling function
Correct Answer: getCust
Explanation:
C use the valid prefixes 'get' and 'is
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: 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: B+ tree structure
Explanation:
B+ 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
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
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