You can cast one instance of a generic class into another only if
the two are otherwise compatible and their type arguments are the same.
class Gen {
T ob;
Gen(T o) {
ob = o;
}
T getObject() {
return ob;
}
}
class Gen2 extends Gen {
Gen2(T o) {
super(o);
}
}
public class MainClass {
public static void main(String args[]) {
Gen intObject = new Gen(88);
Gen2 longObject = new Gen2(99L);
//longObject = (Gen2)intObject;
}
}