How to get 2d array from ArrayList of arrays in java -


i need dynamically create string[][] variable in java. tried code got exception java.lang.classcastexception: [ljava.lang.object; cannot cast [[ljava.lang.string; why , how can create such array?

string [][] gettitles() {   string [][] res= {{""}};     arraylist <string []> titles=new arraylist();     resourcebundle rb=(resourcebundle)config.get(session, "messages");     string titlestring=null;     int i=0;     try     {   rb.getstring(getresourcenameprefix()+"-titles-"+i);     }     catch(exception e)     {   titlestring=null;     }     while(titlestring!=null)     {   string [] title=titlestring.split("\\|",-1);         if(title.length==1 && title[0].length()==0)         {   title=new string [0];         }         titles.add(title);         i++;         try         {   rb.getstring(getresourcenameprefix()+"-titles-"+i);         }         catch(exception e)         {   titlestring=null;         }     }     res=(string [][])titles.toarray();     return(res); }

you can use method toarray(t[] a)

string[][] twodarray = titles.toarray(new string[titles.size()][]);

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