java - Create generic array for toArray method -

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• how create generic array in java? 28 answers

i have following method:

public static <t, u> t[] getkeysforvalue(map<t,u> map,u value){     if(map == null || map.isempty()) {         return null;     }      set<t> keys = new hashset<t>();      (map.entry<t,u> entry : map.entryset()) {         if (entry.getvalue().equals(value)) {             keys.add(entry.getkey());         }     }      return keys.toarray(new t[keys.size()]); } 

i getting compilation error on line: keys.toarray(new t[keys.size()]), says "cannot create generic array of t", obvious. how can solve issue?

you should pass class corresponding t argument of method , call array.newinstance(clazz, size)

public static <t, u> t[] getkeysforvalue(class<t> clazz, map<t,u> map,u value){    t[] array = (t[])array.newinstance(clazz, size);