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Subset doubt

 
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Hi,

If I have a TreeSet s, with Integer objects in it, having the following values:

s = [606, 608, 609, 610, 612]

And I run the following code, in a method:



At the end of this, s2 contains: [608, 609, 610]

Now, according to K&B, the booleans in the subset method above indicate whether the endpoint is exclusive. I am unable to understand that bit. Can someone please point out how exactly do the booleans work in the subSet/subMap syntax?

help appreciated and requested :-)

Best,
aditya

 
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Hello Aditya,

According to Java 6 API, TreeSet implements NavigableSet, which extends SortedSet which exdends Set. The method subSet is defined in SordedSet as

It returns a view of the portion of the set whose elements range from fromElement, inclusive, to toElement, exclusive.

In Java 6, you can also use the subSet method from the NavigableSet, which is defined as:

There you have also the two boolean flags fromInclusive and toInclusive. It returns a view of the portion of the set whose elements are greater than (or equal to, if fromInclusive is true) fromElement and are less than (or equal to, if toInclusive is true) toElement.
 
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dear aditya, notice the underlind bolded parts

Aditya Kumar wrote:Hi,

s = [606, 608, 609, 610, 612]

And I run the following code, in a method:

TreeSet<Integer> s2 = new TreeSet<Integer>();
s2 = (TreeSet)s.subSet(608,true,611, true);

At the end of this, s2 contains: [608, 609, 610]

 
Aditya Kumar
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Dear Rene and Imad,

Thank you for your answers, I get it now. I was actually confused -- I took the ToInclusive argument as ToExclusive, for some reason. It's clear now. thanks again!

Best,
aditya
 
Don't get me started about those stupid light bulbs.
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