Actual type of variable type in parameterized type

Question

Hi all,
Is there way to find out what is actual type of the Variable type in Parameterized type, for example:
class A<T> {
     //actual type of variable type T
     Class<T> tClass;
     public void setTClass() {
          // I don't know what should I do here
     public Class<T> getTClass() {
          return tClass;
     public static void main(String[] args) {
          assert((new A<Integer>().getTClass()).toString().equals("class java.lang.Integer"));
Message was edited by:
MjLaali
Message was edited by:
MjLaali
Message was edited by:
MjLaali

Answer 1

yes ofcource I can't chenge the actual type of variable type T in run time, but I would like to get actual class of T in run time like this example :
package test;
import java.lang.reflect.ParameterizedType;
abstract class B<T>{
     private Class<T> variableClass;
     public B() {
          this.variableClass = (Class<T>) ((ParameterizedType) getClass()
                    .getGenericSuperclass()).getActualTypeArguments()[0];
     public Class<T> getTClass(){
          return variableClass;
class A extends B<Integer> {
     public static void main(String[] args) {
          assert(new A().getTClass() == Integer.class);
but I don't want class A and I would like to move main method to class B.