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    <p>This is actually intended to <em>save</em> memory (and time spent creating objects). A program which uses BigIntegers is likely to have many copies of the same numbers, by storing just one instance of BigInteger(1), you can have hundreds of thousands of references to the number, but only have to create one object.</p> <p>It's worth noting that static initialization happens when a class is referenced, so programs which don't use BigInteger will not store this array. In programs which do use BigInteger, the worst case is you're storing 33 objects you don't have to, but in the best case scenario you're saving on the creation and storage of thousands of objects by simply referring to these constants.</p> <p>This is called the <a href="http://en.m.wikipedia.org/wiki/Flyweight_pattern" rel="nofollow">Flyweight Pattern</a>.</p> <p>Now, why store these specific constants, and not the exact objects used in the program? The latter would require storing every BigInteger used in the program in a hash table, and checking this table every time a new BigInteger is created, which is much more expensive in memory and computation time than the existing solution. You would also have to worry about concurrent modification of the table, so locking would be involved as well. Simply put, memoizing the exact objects used in the program is too expensive to be done by default. Some programs which re-use a lot of BigIntegers outside the range of -16 to 16 will implement this themselves.</p> <p>Small numbers usually occur much more often in programs, which is why these specific values were chosen to be memoized.</p>
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    1. POWhy are they holding this many instances(33) even before being asked for? Where did they get the number 16 from?
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    1. CODoes it really answer the question? You are talking about the pool where BigIntegers can be saved and reused. This is clear, but OP asks why it is created before it is really needed.
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    2. COLets look at it as per your logic . Just with the hope that user will ask number within -16 to 16 they have created 16 instances . say time taken to create an instance be a second (just for example) . you are wasting 33 seconds just because of that hope . What is the probability that he will ask within that range ? I cannot understand ..
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      1. USHarish Kayarohanam
    3. COtypo in comment 2 , it is 33 instances.
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      1. USHarish Kayarohanam
 

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