java - Raw Arrays vs Collection List -


i have gone through many codebases on github , everywhere found 1 common pattern use arrays instead of lists.

example : 

class attributes {    ...    ...    attribute[] attribute;    ...    ... }

so question here is, why of these projects using raw arrays , not collections? below code still same functionality wise , using arrays require of code re-written handle expansion of array.

class attributes {    ...    ...    list<attribute> attribute;    ...    ... }

i don't know sources, i'm pretty sure collections used more arrays, since provide dynamic structure. yet there reasons use arrays well;

-if have limited memory, using arrays better choice.

-if have strict deadlines on program, using arrays better choice.

-if know amount of elements use in program, using arrays better choice.

in nutshell, if need performance, or have limited resources use arrays. if need functionality, use collections.


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