Please explain auto boxing behavior

[dhaval dethe]

// PLEASE EXPLAIN FOLLOWING PROGRAM'S BEHAVIOUR
---->Please explain me how am I getting this OUTPUT ?
---->When I add i1 and i2 into LinkedHashSet with values 20 and 25 respectively
----> I am reassigning i2 as 33 and when I remove i2 it removes i2 with value 33 BUT i2 with value 25 remains in set .At this point only I have got confused.

public class CollectionTest {

	public static void main(String [] args ){
		
		HashSet<Integer> hs = new LinkedHashSet<Integer>();
		Integer i1  = new Integer(20);
		Integer i2  = new Integer(25);
		
		hs.add(i1);
		hs.add(i2);

		i2=33;
		
				
		for (Integer integer : hs) {
			System.out.println("Integers are ::"+ integer);
		}

		
                 hs.remove(i2);
		System.out.println("------------after removing one element i2----------------------");
		
		
		for (Integer integer : hs) {
			System.out.println("Integers are :: " + integer);
		}		
	}
}

---------------------------------------OUTPUT------------------------------------------------------
Integers are ::20
Integers are ::25

------------after removing one element i2----------------------


Integers are :: 20
Integers are :: 25
--------------------------------------------------------------------------------------------------------

[Joseph Arnold]

You are assigning i2 to 33 after inserting i2 into the LinkedHashSet. Now when you try to remove i2, you are actually trying to remove a 33 from the Set which doesn't exist in the Set.
It is similar to,

hs.add(20)
hs.add(25)

and then
hs.remove(33) // 33 doesn't exist in hs. So nothing is removed!!3

When you insert i2 into the set, the set hs stores 25 in it. So when you reassign i2 to 33, the value in hs is unchanged and is 25 only.

[dhaval dethe]

Thanks for your explanation.
I read javadoc for remove method which returns Boolean value as 'false' which means value of i2 =33 has not been added to set so remove() method returns false.