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[最佳答案] I want to select 100000 elements from database,can list store that many elements? Yes. There is an upper limit on the size of an ArrayList (2^31) ... but you are a long way off that. And some other List implementations don't have that limit. I want to fetch all the elements from database in minimum time? Is list is the best way to store elements or is there any other way which can improve performance? Most of the CPU time will be spent performing the query and reading from the resultset rather