java - Constraining method in generic class to specific type -

the code snippet below not compile; have generic class map maps generic key k floats. of methods deal map in generic way.

additionally, want allow initialising map ascending integer values. clearly, requires me constrain method k=integer only. unfortunately, following error:

the method put(k, float) in type map not applicable arguments (k extends integer, float)

any here highly appreciated!

public class myclass<k> {     map<k,float> mymap;      <k extends integer> myclass(int size){        distribution = new hashmap<k,float>();        integer bar = 0;        while(bar<size){           float rnd = threadlocalrandom.current().nextfloat();           mymap.put(bar,rnd);           bar++;        }     } } 

you can extend class , specify parameter type base class:

class myclass<k> {     map<k,float> mymap; } class derived extends myclass<integer>{     void sparsepdt(int size){         mymap = new hashmap<integer,float>();         integer bar = 0;         while(bar<size){             float rnd = threadlocalrandom.current().nextfloat();             mymap.put(bar,rnd);             bar++;         }     } } 

it makes class "myclass" available stay generic , use it's map integer type.
more extending generic classes can read here.
hope helps.