1. Fail Fast and Fail-Safe
Ans- Fail Fast- iterator over-collection and removing the element from the collection.
fail-safe is a concurrent package because use a copy of the collection
2. Why use generics
Ans- In Generics Type parameters provide a way for you to re-use the same code with different inputs.
3. Comparable and Comparator
|
Comparable |
Comparator |
|
1) Comparable provides a single sorting
sequence. In other words, we can sort the collection on the basis of a
single element such as id, name, and price. |
The Comparator provides multiple sorting
sequences. In other words, we can sort the collection on the basis of
multiple elements such as id, name, and price etc. |
|
2) Comparable affects the original class,
i.e., the actual class is modified. |
Comparator doesn't affect the original class,
i.e., the actual class is not modified. |
|
3) Comparable provides compareTo() method to
sort elements. |
Comparator provides compare() method to
sort elements. |
|
4) Comparable is present in java.lang package. |
A Comparator is present in the java.util package. |
|
5) We can sort the list elements of Comparable type
by Collections.sort(List) method. |
We can sort the list elements of Comparator type
by Collections.sort(List, Comparator) method. |
*image source- https://www.javatpoint.com/difference-between-comparable-and-comparator
