What is difference between List and Set
Answer: Below are differences:
| Set | List |
| Elements in Set in not ordered | Elements in list are ordered |
| Allows no duplicate element | Duplicate elements are allowed |
| Because of unordered collection user has no control over where the values are inserted | This is ordered collection so user of this interface has control over where in list values are inserted |
| Element of set couldn’t be accessed by index | Elements in the list could be accessed by index |
Example of set and list:
package com.javahonk.setTest; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; public class SetTest { public static void main(String[] args) { Set<String> set = new HashSet<String>(); set.add("I"); set.add("I"); set.add("am"); set.add("am"); set.add("Java"); set.add("Set"); System.out.println("Set example:"); //Duplicate value won't be added for (String string : set) { System.out.println(string); } System.out.println("\nList example:"); List<String> list = new ArrayList<String>(); list.add("I"); list.add("I"); list.add("am"); list.add("am"); list.add("Java"); list.add("List"); //Duplicate are allowed for (String string : list) { System.out.println(string); } } }
Output:
