Core Java - import java.util.*;public class SetEx { private String str; SetEx(String s) { str = s

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Core Java | Question 424 of 502

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?

Total Answers and Comments: 3

Last Update: August 25, 2009 Asked by: moorthimahalingam

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October 25, 2007 04:20:49

psuresh1982

Member Since: September 2006 Contribution: 1027

RE: import java.util.*;public class SetEx ...

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.

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August 23, 2009 21:01:28

james.vinett

Member Since: August 2009 Contribution: 4

RE: 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

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.

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August 25, 2009 11:35:02

inthiyaj

Member Since: May 2009 Contribution: 4

It prints --->

No Of elements in the Set is 3

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