Difference in order between HashSet and ArrayList

DrRakha

Difference in order between HashSet and ArrayList for a group of strings objects :

Code:

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class Main {

    public static void main(String[] args) {

        String stringsArr[] = {"adam", "tom", "ali", "mina", "saly"};


        List arraylist = new ArrayList();
        Set hashSet = new HashSet();
        for (String str : stringsArr) {
            arraylist.add(str);
            hashSet.add(str);
        }
        Iterator listIterator = arraylist.iterator();
        Iterator setIterator = hashSet.iterator();
        System.out.println("Iterations for array list");
        while (listIterator.hasNext()) {
            System.out.print(listIterator.next() + "\t");
        }
        /*
         *  Notice that the output of set object is not in order.
         * 
         */
        System.out.println("\nIterations for hash set.");
        while (setIterator.hasNext()) {
            System.out.print(setIterator.next() + "\t");
        }
    }
}
 

The output for this snippet :

Code:

Iterations for array list.
adam        tom        ali        mina        saly        
Iterations for hash set.
saly        ali        adam        mina        tom 

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Difference in order between HashSet and ArrayList

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