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- Question
How is final different from finally and finalize()?
- 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
- 1. When will you define a method as static? Discuss
- 2. I do not want my class to be inherited by any other class. What should i do? Discuss
- 3. What is the purpose of declaring a variable as final? Discuss
- 4. Can a class be declared as protected? Discuss
- 5. Which package is imported by default? Discuss
- 6. 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
- 7. 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
- 8. Keeping the actoins and attributes together under a single unit is called
Options- A. Encapsulation
- B. Information Hiding
- C. Polymorphism
- D. Inheritance Discuss
- 9. 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
- 10. What are the 3main tasks of JVM? Discuss
Technology problems
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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
Correct Answer: You should declared your class as final But you can't define your class as final, if it is an abstract class A class declared as final can't be extended by any other class
Correct Answer: A final variable's value can't be changed final variables should be initialized before using them
Correct Answer: A class can't be declared as protected only methods can be declared as protected
Correct Answer: javalang package is imported by default even without a package declaration
Correct Answer: class King { private Soldier bestFriend; }
Correct Answer: 2
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
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
Correct Answer: The JVM performs three main tasks: ? Loads code ? Verifies code ? Executes code
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