Difference between Set and List

List is a type of ordered collection that maintains the elements in insertion order while Set is a type of unordered collection so elements are not maintained any order. List allows duplicates while Set doesn't allow duplicate elements .

1. Which is better list or set?
2. What is the difference between set list and map?
3. What is the difference between list set and queue?
4. What is the difference between set and list in python?
5. Which is faster list or set?
6. Why use a set instead of a list?
7. Does ArrayList accept null?
8. Which is faster list or set in Java?
9. Can a list have NULL values?
10. Does ArrayList maintain order of insertion?
11. What are collection Apis give me an example?
12. What is a set in Java?

Which is better list or set?

If the requirement is to have only unique values then Set is your best bet as any implementation of Set maintains unique values only. If there is a need to maintain the insertion order irrespective of the duplicity then List is a best option.

What is the difference between set list and map?

Both Set and Map interfaces are used to store a collection of objects as a single unit. The main difference between Set and Map is that Set is unordered and contains different elements, whereas Map contains the data in the key-value pair.

What is the difference between list set and queue?

In brief: A list is an ordered list of objects, where the same object may well appear more than once. ... You can add an element anywhere in the list, change an element anywhere in the list, or remove an element from any position in the list. A queue is also ordered, but you'll only ever touch elements at one end.

What is the difference between set and list in python?

A set is a collection which is unordered and unindexed, and doesnt allow duplicates. In Python, sets are written with curly brackets. A list is a collection which is ordered and changeable. In Python lists are written with square brackets.

Which is faster list or set?

Sets are implemented using hash tables. ... This is also the reason that sets do not preserve the order of the objects you add. Note that sets aren't faster than lists in general -- membership test is faster for sets, and so is removing an element. As long as you don't need these operations, lists are often faster.

Why use a set instead of a list?

1) Fundamental difference between List and Set in Java is allowing duplicate elements. List in Java allows duplicates while Set doesn't allow any duplicate. If you insert duplicate in Set it will replace the older value. Any implementation of Set in Java will only contains unique elements.

Does ArrayList accept null?

5) Nulls: ArrayList can have any number of null elements. HashMap allows one null key and any number of null values.

Which is faster list or set in Java?

If you're certain your data will be unique, use a List. You can use a Set to enforce this rule. Sets are faster than Lists if you have a large data set, while the inverse is true for smaller data sets.

Can a list have NULL values?

2) Null values: List allows any number of null values. Set allows single null value at most. Map can have single null key at most and any number of null values.

Does ArrayList maintain order of insertion?

ArrayList maintains the insertion order i.e order of the object in which they are inserted. HashSet is an unordered collection and doesn't maintain any order. ArrayList allows duplicate values in its collection.

What are collection Apis give me an example?

The Collection API is a set of classes and interfaces that support operation on collections of objects. Example of classes: HashSet, HashMap, ArrayList, LinkedList, TreeSet and TreeMap. ... Example of interfaces: Collection, Set, List and Map.

What is a set in Java?

A Set is a Collection that cannot contain duplicate elements. It models the mathematical set abstraction. ... Two Set instances are equal if they contain the same elements. The Java platform contains three general-purpose Set implementations: HashSet , TreeSet , and LinkedHashSet .