Import java.util.*;public class SetEx { private String str; SetEx(String s) { str = s } public static void main(String[] ar) { Set s = new HashSet(); SetEx setEx = new SetEx("Java"); SetEx setEx1 = new SetEx("Java"); String str1 = new String("Java"); String str2 = new String("Java"); s.add(setEx); s.add(setEx1); s.add(str1); s.add(str2); System.out.println("No Of elements in the Set is " + s.size()); }What is the result and how?

moorthimahalingam
Profile Answers by moorthimahalingam Questions by moorthimahalingam
Aug 6th, 2007
3
2517

Questions by moorthimahalingam answers by moorthimahalingam

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psuresh1982
Profile Answers by psuresh1982

Oct 25th, 2007

The Result is 3.

Hashset does not allowed duplicates. Here str1 and str2 considered as a duplicate. So it will erase one of the element. So the result shows 3.

james.vinett
Profile Answers by james.vinett

Aug 23rd, 2009

The result is 3 even though you would want it to be 2.You MUST override equals() and hashCode() for proper use of add in HashSet.