Technology problems
- 1. When will you define a method as static? Discuss
Correct Answer: When a method needs to be accessed even before the creation of the object of the class then we should declare the method as static
- 2. How is final different from finally and finalize()? Discuss
Correct Answer: final is a modifier which can be applied to a class or a method or a variable final class can't be inherited, final method can't be overridden and final variable can't be changed finally is an exception handling code section which gets executed whether an exception is raised or not by the try block code segment finalize() is a method of Object class which will be executed by the JVM just before garbage collecting object to give a final chance for resource releasing activity
- 3. Which king class properly represents the relationship "King has a best friend who is a Soldier"?
Options- A. class King extends Soldier { }
- B. class King implements Soldier { }
- C. class King { private BestFriend Soldier; }
- D. class King { private Soldier bestFriend; } Discuss
Correct Answer: class King { private Soldier bestFriend; }
- 4. How many of the following will follow JavaBean Listener naming rules? addListener addMouseListener deleteMouseListener removeMouseListener registerMouseListener
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 2
- 5. Keeping the actoins and attributes together under a single unit is called
Options- A. Encapsulation
- B. Information Hiding
- C. Polymorphism
- D. Inheritance Discuss
Correct Answer: Encapsulation
Explanation:
Encapsulation is a process of binding the data objects together under a single unit.It is one ofthe elements of oops
- 6. By whom will the unallocated memory that is no longer needed will be cleared in java?
Options- A. Java Virtual Machine
- B. Garebage collector
- C. Both A and B
- D. None Discuss
Correct Answer: Garebage collector
Explanation:
The Java programming language provides a system-level thread to track memory allocation.
Garbage collection has the following characteristics:
? Checks for and frees memory no longer needed
? Is done automatically
? Can vary dramatically across JVM implementations
- 7. What are the 3main tasks of JVM? Discuss
Correct Answer: The JVM performs three main tasks: ? Loads code ? Verifies code ? Executes code
- 8. An algorithm written once which can be used in many places is called
Options- A. Block
- B. Function
- C. Datatype
- D. None Discuss
Correct Answer: Function
Explanation:
Function is an algorithm which can be used any where in the program when required
- 9. Client code having direct access to internal data is called
Options- A. Encapsulation
- B. DataHiding
- C. Polymorphism
- D. DataAbstraction Discuss
Correct Answer: DataHiding
Explanation:
Client code must use setters and getters to access internal data in DataHiding
- 10. There is one default constructor in every class.
Options- A. The above statement is true
- B. The above statement is false
- C. Both true and false
- D. None Discuss
Correct Answer: The above statement is true
Explanation:
There will always be a default constructor in every class
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