java - extending a class where a parameter of the parent class extends a class -


i trying extend version of treemap subclass index words more efficiently, unsure correct syntax is. class definition treemap looks this

public class mytreemap<k extends comparable<? super k>,v> extends abstractmap<k,v> {

extending class in straightforward way

public class treemapindexer<k> extends mytreemap<k,linkedlist<integer>> {

yields error "bound mismatch: type k not valid substitute bounded parameter > of type mytreemap".

i tried 

public class treemapindexer<k> extends  mytreemap<k extends comparable<? super k>, linkedlist<integer>> {

instead, yields compiler error "syntax error on token "extends", , expected". erroneous extends in "".

i found thread (generic generics: "syntax error on token "extends", , expected") same error message. appears different situation mine, tried 

public class treemapindexer<k> extends  mytreemap<k, k extends comparable<? super k>, linkedlist<integer>> {

which yields same "syntax error on token "extends", , expected" compiler message.

class mytreemap<k extends comparable<? super k>, v> extends abstractmap<k, v>

so k declared bound of extends comparable<? super k>. need redeclare same bound on subclass.

class treemapindexer<k extends comparable<? super k>> extends mytreemap<k, linkedlist<integer>>

otherwise attempting declare subtype not having restriction compilation error 'bound mismatch'.

what tried right, bound needed in generic type declaration, not arguments (passed along) superclass.


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