In this post, we will see about LinkedHashSet in java. LinkedHashSet is same as HashSet except that it maintains insertion order.
Some points about LinkedHashSet
- LinkedHashSet implements Set interface and extends HashSet class.
- LinkedHashSet maintains insertion order, so when you will be able to access elements in the order they were inserted like ArrayList.
Example:
LinkedHashSetMain.java
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package org.arpit.java2blog; import java.util.LinkedHashSet; public class LinkedHashSetMain { public static void main(String args[]) { // LinkedHashSet with Country // LinkedHashSet maintains insertion order LinkedHashSet<String> countryHashSet=new LinkedHashSet<String>(); countryHashSet.add("India"); countryHashSet.add("Japan"); countryHashSet.add("France"); countryHashSet.add("Russia"); countryHashSet.add("India"); countryHashSet.add("France"); countryHashSet.add("United Kingdom"); System.out.println("-----------------------------"); System.out.println("Iterating LinkedHashSet"); System.out.println("-----------------------------"); for (String country:countryHashSet) { System.out.println(country); } System.out.println("-----------------------------"); } } |
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----------------------------- Iterating LinkedHashSet ----------------------------- India Japan France Russia United Kingdom ----------------------------- |
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