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Judul : Difference Betwixt Treeset, Linkedhashset As Well As Hashset Inwards Coffee Alongside Example
link : Difference Betwixt Treeset, Linkedhashset As Well As Hashset Inwards Coffee Alongside Example

Difference Betwixt Treeset, Linkedhashset As Well As Hashset Inwards Coffee Alongside Example

TreeSet, LinkedHashSet in addition to HashSet all are implementation of Set interface in addition to past times virtue of that, they follows contract of Set interface i.e. they exercise non allow duplicate elements. Despite beingness from same type hierarchy,  at that spot are lot of departure betwixt them; which is of import to understand, thence that you lot tin conduct most appropriate Set implementation based upon your requirement. By the way departure betwixt TreeSet in addition to HashSet or LinkedHashSet is besides i of the popular Java Collection interview question, non every bit pop every bit Hashtable vs HashMap or ArrayList vs Vector but nonetheless appears inwards diverse Java interviews. In this article nosotros volition meet difference betwixt HashSet, TreeSet in addition to LinkedHashSet on diverse points e.g. Ordering of elements, performance, allowing goose egg etc in addition to thence nosotros volition meet When to utilisation TreeSet or LinkedHashSet or simply HashSet inwards Java.

Difference betwixt TreeSet, LinkedHashSet in addition to HashSet inwards Java

TreeSet, LinkedHashSet in addition to HashSet inwards Java are 3 Set implementation inwards collection framework in addition to similar many others they are besides used to shop objects. Main characteristic of TreeSet is sorting,  LinkedHashSet is insertion guild in addition to HashSet is merely full general utilisation collection for storing object. HashSet is implemented using HashMap inwards Java spell TreeSet is implemented using TreeMap.  TreeSet is a SortedSet implementation which allows it to proceed elements inwards the sorted guild defined past times either Comparable or Comparator interface. Comparable is used for natural guild sorting in addition to Comparator for custom guild sorting of objects, which tin live on provided spell creating illustration of TreeSet. Anyway before seeing departure betwixt TreeSet, LinkedHashSet in addition to HashSet, let's meet or thence similarities betwixt them:

1) Duplicates : All 3 implements Set interface agency they are non allowed to shop duplicates.

2) Thread security : HashSet, TreeSet in addition to LinkedHashSet are non thread-safe, if you utilisation them inwards multi-threading surround where at to the lowest degree i Thread  modifies Set you lot take to externally synchronize them.

3) Fail-Fast Iterator : Iterator returned past times TreeSet, LinkedHashSet in addition to HashSet are fail-fast Iterator. i.e. If Iterator is modified subsequently its creation past times whatsoever way other than Iterators remove() method, it volition throw ConcurrentModificationException amongst best of effort. read to a greater extent than about fail-fast vs fail-safe Iterator here

Now let’s meet difference betwixt HashSet, LinkedHashSet in addition to TreeSet inwards Java :

Performance in addition to Speed : First departure betwixt them comes inwards damage of  speed.  HashSet is fastest, LinkedHashSet is minute on performance or nigh similar to HashSet but TreeSet is flake slower because of sorting performance it needs to perform on each insertion. TreeSet provides guaranteed O(log(n)) fourth dimension for mutual operations similar add, take in addition to contains, spell HashSet in addition to LinkedHashSet offering constant fourth dimension performance e.g. O(1) for add, contains in addition to take given hash business office uniformly distribute elements inwards bucket.

Ordering : HashSet does non keep whatsoever guild spell LinkedHashSet maintains insertion guild of elements much similar List interface in addition to TreeSet maintains sorting guild or elements.

Internal Implementation : HashSet is backed past times an HashMap instance, LinkedHashSet is implemented using HashSet in addition to LinkedList spell TreeSet is backed upwardly past times NavigableMap inwards Java in addition to past times default it uses TreeMap.

null : Both HashSet in addition to LinkedHashSet allows goose egg but TreeSet doesn't allow goose egg but TreeSet doesn't allow goose egg in addition to throw java.lang.NullPointerException when you lot volition insert goose egg into TreeSet. Since TreeSet uses compareTo() method of respective elements to compare them  which throws NullPointerException spell comparing amongst null, hither is an example:

TreeSet cities

Exception inwards thread "main" java.lang.NullPointerException

        at java.lang.String.compareTo(String.java:1167)

        at java.lang.String.compareTo(String.java:92)

        at java.util.TreeMap.put(TreeMap.java:545)

        at java.util.TreeSet.add(TreeSet.java:238)

Comparison : HashSet in addition to LinkedHashSet uses equals() method inwards Java for comparing but TreeSet uses compareTo() method for maintaining ordering. That's why compareTo() should live on consistent to equals inwards Java. failing to exercise thence interruption full general contact of Set interface i.e. it tin permit duplicates.

TreeSet vs HashSet vs LinkedHashSet - Example

Let’s compare all these Set implementation on or thence points past times writing Java program. In this illustration nosotros are demonstrating departure inwards ordering, fourth dimension taking spell inserting 1M records amidst TreeSet, HashSet in addition to LinkedHashSet inwards Java. This volition attention to solidify or thence points which discussed inwards before department in addition to attention to determine when to utilisation HashSet, LinkedHashSet or TreeSet inwards Java.

import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

/**
 * Java plan to demonstrate departure betwixt TreeSet, HashSet in addition to LinkedHashSet

 * inwards Java Collection.
 * @author
 */
public class SetComparision {
 
    public static void main(String args[]){            
        HashSet<String> fruitsStore = new HashSet<String>();
        LinkedHashSet<String> fruitMarket = new LinkedHashSet<String>();
        TreeSet<String> fruitBuzz = new TreeSet<String>();
     
        for(String fruit: Arrays.asList("mango", "apple", "banana")){
            fruitsStore.add(fruit);
            fruitMarket.add(fruit);
            fruitBuzz.add(fruit);
        }
       

        //no ordering inwards HashSet – elements stored inwards random order
        System.out.println("Ordering inwards HashSet :" + fruitsStore);

        //insertion guild or elements – LinkedHashSet storeds elements every bit insertion
        System.err.println("Order of chemical constituent inwards LinkedHashSet :" + fruitMarket);

        //should live on sorted guild – TreeSet stores chemical constituent inwards sorted guild
        System.out.println("Order of objects inwards TreeSet :" + fruitBuzz); 

     

        //Performance attempt to insert 10M elements inwards HashSet, LinkedHashSet in addition to TreeSet
        Set<Integer> numbers = new HashSet<Integer>();
        long startTime = System.nanoTime();
        for(int i =0; i<10000000; i++){
            numbers.add(i);
        }

        long endTime = System.nanoTime();
        System.out.println("Total fourth dimension to insert 10M elements inwards HashSet inwards s : "

                            + (endTime - startTime));
     
     
        // LinkedHashSet performance Test – inserting 10M objects

        numbers = new LinkedHashSet<Integer>();
        startTime = System.nanoTime();
        for(int i =0; i<10000000; i++){
            numbers.add(i);
        }
        endTime = System.nanoTime();
        System.out.println("Total fourth dimension to insert 10M elements inwards LinkedHashSet inwards s : "

                            + (endTime - startTime));
       

        // TreeSet performance Test – inserting 10M objects
        numbers = new TreeSet<Integer>();
        startTime = System.nanoTime();
        for(int i =0; i<10000000; i++){
            numbers.add(i);
        }
        endTime = System.nanoTime();
        System.out.println("Total fourth dimension to insert 10M elements inwards TreeSet inwards s : "

                            + (endTime - startTime));
    }
}

Output
Ordering inwards HashSet :[banana, apple, mango]
Order of chemical constituent inwards LinkedHashSet :[mango, apple, banana]
Order of objects inwards TreeSet :[apple, banana, mango]
Total fourth dimension to insert 10M elements inwards HashSet inwards s : 3564570637
Total fourth dimension to insert 10M elements inwards LinkedHashSet inwards s : 3511277551
Total fourth dimension to insert 10M elements inwards TreeSet inwards s : 10968043705

When to utilisation HashSet, TreeSet in addition to LinkedHashSet inwards Java

Since all 3 implements Set interface they tin be used for mutual Set operations similar non allowing duplicates but since HashSet, TreeSet in addition to LinkedHashSet has at that spot particular characteristic which makes them appropriate inwards sure enough scenario. Because of sorting guild provided past times TreeSet, utilisation TreeSet when you lot take a collection where elements are sorted without duplicates. HashSet are rather full general utilisation Set implementation, Use it every bit default Set implementation if you lot take a fast, duplicate costless collection. LinkedHashSet is extension of HashSet in addition to its to a greater extent than suitable where you lot take to keep insertion order of elements, similar to List without compromising performance for costly TreeSet. Another utilisation of LinkedHashSet is for creating copies of existing Set, Since LinkedHashSet preservers insertion order, it returns Set which contains same elements inwards same guild similar exact copy. In short,  although all 3 are Set interface implementation they offering distinctive feature, HashSet is a full general utilisation Set spell LinkedHashSet provides insertion guild guarantee in addition to TreeSet is a SortedSet which stores elements inwards sorted guild specified past times Comparator or Comparable inwards Java.

How to re-create object from i Set to other

Here is code illustration of LinkedHashSet which demonstrate How LinkedHashSet tin live on used to re-create objects from i Set to or thence other without losing order. You volition larn exact replica of origin Set, inwards damage of contents in addition to order. Here static method copy(Set source) is written using Generics, This sort of parameterized method provides type-safety in addition to attention to avoid ClassCastException at runtime.

import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * Java plan to copy object from i HashSet to or thence other using LinkedHashSet.
 * LinkedHashSet preserves guild of chemical constituent spell copying elements.
 *
 * @author Javin
 */
public class SetUtils{
   
    public static void main(String args[]) {
       
        HashSet<String> origin = new HashSet<String>(Arrays.asList("Set, List, Map"));
        System.out.println("source : " + source);
        Set<String> re-create = SetUtils.copy(source);
        System.out.println("copy of HashSet using LinkedHashSet: " + copy);
    }
   
    /*
     * Static utility method to re-create Set inwards Java
     */
    public static <T> Set<T> copy(Set<T> source){
           return new LinkedHashSet<T>(source);
    }
}
Output:
origin : [Set, List, Map]
re-create of HashSet using LinkedHashSet: [Set, List, Map]

Always code for interface than implementation thence that you lot tin supersede HashSet to LinkedHashSet or TreeSet when your requirement changes. That’s all on difference betwixt HashSet, LinkedHashSet in addition to TreeSet inwards Java.  If you lot know whatsoever other pregnant departure betwixt TreeSet, LinkedHashSet in addition to HashSet which is worth remembering than delight add together every bit comment.

Further Learning
Java In-Depth: Become a Complete Java Engineer
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4 ways to loop Map inwards Java amongst examples

How to convert List to Array inwards Java

How to create read solely or unmodifiable Collection inwards Java

How to convert Collection to coma separated String inwards Java

10 illustration of Hashtable inwards Java - tutorial

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