Java generic method type casting -

why happened? 1 line in code works while other similar line doesn't. automatic type cast happen in conditions? have tried assign gt.echov() object , works well; when assign string, same error come out again.

public class genemethodtest {      public static void main(string... args) {         genemethodtest gt = new genemethodtest();         gt.<string>echov(); //this line works         gt.<string>echov().getclass();//this line leads type cast exception                                                               }      public <t> t echov() {         t t=(t)(new object());                                                                             return t;     } } 

gt.<string>echov().getclass(); produces equivalent of following sequence of operations:

// inside echov object t = new object();  // note not string! object returnvalue = t; // in main string stacktemp = (string) returnvalue;  // operation fails stacktemp.getclass(); 

what "for free" generics (string) cast. nothing else.