Java Generics

Question 1

Why use java generics

Answer 1

To avoid rewriting code to be used for lots of different types

Instead write one which will have a generic type that can be implemented for all types

Question 2

between what symbols should the type be put in between

Answer 2

< >

Question 3

what is a primitive type in java

Answer 3

the predefined data types eg int, string, long, float, boolean

Question 4

what is a wrapper in java

Answer 4

a way to use the primitive types as objects

Question 5

what is the Int wrapper class

Answer 5

Integer

Question 6

What happens if a client modifies the data structure while iterating?

Answer 6

A fail-fast iterator throws a java.util.ConcurrentModificationException.

Question 7

when a class is initialised what will the placeholder be replaced with

Answer 7

the actual type

Question 8

what is the issue with the operation

object 1 == object 2

Answer 8

will only compare the memory addresses, but most of the time, we do not want to know this

Question 9

What does the comparable interface return if the objects are the same

Answer 9

0