java - How to upper bound a map's value type -



java - How to upper bound a map's value type -

when should 1 of these preferred another?

public static void dostuffwithit_a( map<integer, ? extends object > thethings){ ...} public static void dostuffwithit_b( map<integer, ? > thethings){ ...} public static void dostuffwithit_c( map<integer, object > thethings){ ...}

i've been using variable parameters passing interface in java, inspired python's "**kw"argument syntax, , i'm trying 'more right'

by using object, first , sec alternative same thing. there important differences between 2 , 3rd option, however. consider calling methods. if 1 has map<integer, string>, phone call first 2, not 3rd option. within method itself, 3rd alternative allow method insert info map (without resorting dropping generic definition , - optionally - casting arg).

java generics bounded-wildcard

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