java - Cannot cast from and ArrayList to HashMap -


i'm having problem arraylist of list of hashmaps. tried cast not allowed. here offending code:

list<list<hashmap>> myhashmaps = asyncmusichashmap.fillhashmap(path); hashmap<string, string> artisthashmap = (hashmap<string, string>) myhashmaps.get(0); hashmap<string, list<string>> albumhashmap = (hashmap<string, list<string>>) myhashmaps.get(1); hashmap<string, list<string>> songhashmap = (hashmap<string, list<string>>) myhashmaps.get(2);

with following exception message:

exception in thread "main" java.lang.classcastexception: java.util.arraylist cannot cast java.util.hashmap     @ com.bkane56.mp3.mp3handlingdao.addmusictodatabase(mp3handlingdao.java:51)     @ com.bkane56.mp3.mp3handler.main(mp3handler.java:21)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:497)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:140)

the mentioned line 51 in class mp3handlingdao is:

hashmap<string, string> artisthashmap = (hashmap<string, string>) myhashmaps.get(0);

probably simple stuck.

he has error in declaration:

list<list<hashmap>> myhashmaps = asyncmusichashmap.fillhashmap(path);

i think instruction can resolve problem because if cast myhashmaps.get(0) hashmap, list parameter maybe hashmap(string, string). try again declaration : 

list<hashmap(string, string)> myhashmaps = asyncmusichashmap.fillhashmap(path);

thanks


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