What's the difference between a list and a set?

The main difference between List and Set is that Set is unordered and contains different elements, whereas the list is ordered and can contain the same elements in it.

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next → ← prev Difference Between List and Set in Java In JDK 2.0, we used to use Vectors, Arrays, and Hashtable to group the objects into a single unit. In JDK 8, Collection framework come in to existence that provides several interfaces to work with a collection of data. List and Set interfaces are one of them that are used to group the object. Both interfaces extend the Collection interface. The main difference between List and Set is that Set is unordered and contains different elements, whereas the list is ordered and can contain the same elements in it. Let's discuss in detail. List Interface The java.util package provides the List interface for maintaining the ordered collection. A List can contain the null and duplicate values. The methods of the List are based on the index, so all the operations like insert, delete, update, and search is based on the index. ArrayList, LinkedList, Stack, and Vector are the implementation classes available in the List interface. In Java, we mostly used the ArrayList and LinkedList implementation classes to design a list. Let's use the List interface in a Java program. ListExample.java import java.util.*; class ListExample{ public static void main(String args[]){ //Create List List names = new ArrayList (); //Adding elements in the List. names.add("Emma"); names.add("Adele"); names.add("Aria"); names.add("Ally"); //Performing iteration of list to print each element of it. for(String name: names) System.out.println(name); } } Output: Set Interface The Set interface belongs to the java.util package that extends the Collection interface. It restricts us from entering the distinct value in it. It stores the value in a sorted way, so it doesn't maintain the insertion order. The set interface is used to design the mathematical Set in Java. Let's see an example to understand how to create a set in Java. SetExample.java import java.util.*; public class SetExample{ public static void main(String[] args) { // creating HashSet implementation using the Set Set veg = new HashSet (); veg.add("Ginger"); veg.add("Garlic"); veg.add("Onion"); veg.add("Ginger"); System.out.println(veg); } } Output: List Vs Set Interface In Java, both the List and the Set are available in the Collection framework. In order to store the collection of objects as a single unit, Set and List interface are used. Apart from these similarities, both the interfaces have so many differences too, which are as follows: S.No List Set 1. The list implementation allows us to add the same or duplicate elements. The set implementation doesn't allow us to add the same or duplicate elements. 2. The insertion order is maintained by the List. It doesn't maintain the insertion order of elements. 3. List allows us to add any number of null values. Set allows us to add at least one null value in it. 4. The List implementation classes are LinkedList and ArrayList. The Set implementation classes are TreeSet, HashSet and LinkedHashSet. 5. We can get the element of a specified index from the list using the get() method. We cannot find the element from the Set based on the index because it doesn't provide any get method(). 6. It is used when we want to frequently access the elements by using the index. It is used when we want to design a collection of distinct elements. 7. The method of List interface listiterator() is used to iterate the List elements. The iterator is used when we need to iterate the Set elements. Next Topic How many days required to learn Java

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How long is 2 beats?

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Is repetition is allowed in set?

No. Sets are collections where repetition and order are ignored.

math.stackexchange.com - Can elements in a set be duplicated? - Mathematics Stack Exchange

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The original question is simply ill-posed, since "letter" is ambiguous between letter-tokens and letter-types. I'm doing the crossword. I ask you "What's an a eight letter word beginning with 'c' that means disparity?" Obviously here I mean to count letter-tokens. "Contrast" is an eight letter word in this crossword sense, as it contains eight letter-tokens though these happen to exemplify only seven different types of letter. I challenge you: "Only use the first fifteen letters of the alphabet in your tweets today". Obviously here I'm talking about letter types. It is ok for you to tweet "Eeek. Killing me!" even though that contains many tokens of the same letter type. Likewise talk about words is ambiguous between word-tokens or word-types. "How many words are there in Shakespeare?" could be asking how many word-tokens there are in the corpus, or how many word-types are there exemplified. (I think it is to C.S. Peirce we owe the type/token terminology for making the obvious distinction.)