Difference between list and set in java
Difference between List and Set in java can be based on below given parameters.
1. Duplicate Object
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List allows duplicate elements to be stored in it.
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Set doesn’t allow duplicate element. All the element needs to be unique.
2. Order Maintenance
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List generally maintains the insertion order.
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In set maintenance of insertion order depends on the implementing class. (HashSet-> order not guaranteed, LinkedHashSet-> Order is maintained)
3. Null value
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In List, one can store unlimited null values
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In Set, only one null value is permitted.
4. Implementations
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ArrayList class, LinkedList class and Vector class implements List interface.
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HashSet class, LinkedHashSet class and TreeSet class implements Set interface.
5. Traversal
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We can use both ListIterator and Iterator to traverse elements in List.
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We cannot use ListIterator to iterate Set. In order to traverse Set use Iterator.
Example of list and set implementation in java code
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class ListandSet {
public static void main(String[] args) {
//Implentation of list
List<String> arrayList = new ArrayList<String>();
arrayList.add("A");
arrayList.add("B");
arrayList.add("A");
arrayList.add("C");
arrayList.add("D");
System.out.println("List elements:"+ arrayList);
//Implementation of set
Set<String> set = new HashSet<String>();
set.add("A");
set.add("B");
set.add("A");
set.add("C");
set.add("D");
System.out.println("Set elements:"+ set);
}
}
OUTPUT
List elements:[A, B, A, C, D]
Set elements:[A, B, C, D]
Notice, the duplicate element "A" is not stored in set while it is stored in List.
We have covered major difference between list vs set.
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About the Author
Rohanjit Kumar
Technology geek, loves to write and share knowledge with the world. Having 9+ years of IT experience. B.Tech in Computer Science & Engineering
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Published Date :
Jul 12,2020
