HashSet in Java


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HashSet in Collection Framework

HashSet is Implementer class of Set Interface. HashSet supports hashing mechanism to store the value that means all the elements are stored in un-shorted random order (the elements will not be in same order as inserted).

hashset

Points to Remember

  • HashSet are not allows to store duplicate elements.
  • HashSet allows to store heterogeneous elements.
  • For retrieving elements from HashSet you can use foreach loop and iterator interface to retrieve the elements.
  • HashSet is not Synchronized means multiple threads can work Sanctimoniously.
  • HashSet allows to store null value.

Example of HashSet

import java.util.*;

class HashSetDemo
{
public static void main(String args[])
	{
	HashSet<String> hs=new HashSet<String>();
	hs.add("Java");
	hs.add("C-lang");
	hs.add("C++");
	hs.add("Java");
   System.out.println(hs);
   Iterator i=hs.iterator();
   System.out.println("Forward Direction");

	while(l.hasNext())
	{
	System.out.println(i.next());
	}
	}
}

Output

Java
C-lang
C++

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