Declare and use List in java -


i touch java, found if need create new list

list<string> = new arraylist<string>();

but in homework, code following. in function postering, parameter list<integer> positions . can put 'arraylist' there? or usually put list there?

could explain in detailed way?

static class posting { int docid; list<integer> positions; public posting(int docid, list<integer> positions) {   this.docid = docid;   this.positions = positions; }

}

list<integer> interface; arraylist<integer> class implementing interface. should use list<integer>, because lets caller change implementation - example, linkedlist<integer>.

this technique improving flexibility known programming interface. can read more advantages in answers question.


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