What will be the output of following java code snippet?

[java4all]

public class Test {
public static void main(String[] args) {
HashSet s = new HashSet();
for(short i = 0; i<100;i++){
s.add(i);
s.remove(i-1);
}
System.out.println(s.size());
}
}

< spoiler removed >

[JosAH]

If you really can't find the answer by thinking about it simpy cook up a compilable
and runnable piece of code, run it and see for yourself.

kind regards,

Jos

ps. answer: 1

[karthickkuchanur]

If you really can't find the answer by thinking about it simpy cook up a compilable
and runnable piece of code, run it and see for yourself.

kind regards,

Jos

ps. answer: 1

Whether it is possible to add the integer to hashset

[JosAH]

Whether it is possible to add the integer to hashset

Since Java 1.5 it is: autoboxing (but then you need a Set<Short>)

kind regards,

Jos

[karthickkuchanur]

Since Java 1.5 it is: autoboxing (but then you need a Set<Short>)

kind regards,

Jos

public class Test {
public static void main(String[] args) {
HashSet s = new HashSet();
for(short i = 0; i<100;i++){
s.add(String.valueOf(i));
s.remove(String.valueOf(i-1));
}
System.out.println(s.size());
}
}

i just run above code like this so wat iam asking

[JosAH]

i just run above code like this so wat iam asking

I'm sorry I don't understand what you're saying; the original example uses a raw
Set; since Java 1.5 you shouldn't do that anymore; use a Set<Short> or Set<Integer>
instead. Is that what you're talking about?

kind regards,

Jos

[karthickkuchanur]

OK thanks ,nothing i dont know what is mean <set>Short.

[JosAH]

OK thanks ,nothing i dont know what is mean <set>Short.

Read this article for a nice tutorial on generics.

kind regards,

Jos

[chaarmann]

I don't think you run your code successfully.
You should get an error for calling String.valueOf(-1), (Index out of bounds exception) because the first time inside the loop i=0 !

...
for(short i = 0; i<100;i++){
...
s.remove(String.valueOf(i-1));
}
...
 

i just run above code like this so wat iam asking

[JosAH]

I don't think you run your code successfully.
You should get an error for calling String.valueOf(-1), (Index out of bounds exception) because the first time inside the loop i=0 !

The value -1 is a value to be deleted from a Set, not its index.

kind regards,

Jos

[karthickkuchanur]

Thanks Josh may know wre r u from

[java4all]

I have found the answer to this question at
http://java4all.info/corejava/interview-questions/java-interview-questions.html#q4

Thanks

[JosAH]

I have found the answer to this question at
http://java4all.info/corejava/interview-questions/java-interview-questions.html#q4

Thanks

Bloody autoboxing ... again it got me ...

kind regards,

Jos

[shaileshkumar]

out put : 100.
-----------------------------------------------------------------
remove() in HashSet

public boolean remove(Object o)

Removes the specified element from this set if it is present.

Specified by:
remove in interface Set
Overrides:
remove in class AbstractCollection

Parameters:
o - object to be removed from this set, if present.
Returns:
true if the set contained the specified element.

------------------------------------------------------------------------------------
Since you are requesting size ,you will get 100.
---------------------------------------------------------------------------
JDK1.5 uses concept called autoboxing.
You face no problem in executing the program.
--------------------------------------------------------------------

regards,
shailesh