Chapter 4

Question 1

What is difference between byte code and instruction set

Answer 1

both are same thing but instruction set is compiler dependent.

Question 2

What is JAVA virtual machine

Answer 2

Byte code to instruction set is called Java virtual machine. It gives plate form independence. It also controls memory allocation.

Question 3

What is JIT

Answer 3

Just in time compilation means only compile the part which is necessary

Question 4

What is garbage collection

Answer 4

It deletes such memory locations which are not referred

Question 5

What is COM

Answer 5

component object model, Microsoft component based programming. Its basic purpose is OLE (object linking and embedding)

Question 6

What are ActiveX controls

Answer 6

These are com objects

Question 7

What is clean room implementation

Answer 7

We take a program, reverse engineer it and write its specifications. And then write a program from scratch by following these specifications. In this way, we are not copying anything and no illegal activity and copyright problem. C# is a clean room implementation of JAVA by microsoft.

Question 8

C# is strict Boolean. What is strict Boolean

Answer 8

Either it takes true or false

Question 9

Is C# totally garbage collected

Answer 9

Yes

Question 10

Does C# have multiple inheritance

Answer 10

No

Question 11

What are 2 common types in C#

Answer 11

1. Value type (No referential identity)

2. Reference type (Referential identity and referential identity get compared)

Question 12

What is boxing and unboxing

Answer 12

int foo = 42; // value type
object bar = foo; // foo is boxed
int foo2 = (int)bar; // unbox back