Possible to return List T from a method based on Class T parameter?

Question

Hi all,
I would like to implement a method as below:
private List<T> createList(Class<T> cls) {
}This method would then be possible to call this way:
List<?> myDynamicGenericList = createList(someClass);Where someClass could be BigDecimal.class (should be known at compile time I suppose, cannot use reference to just "Class")
I would then like to be able to get type check when adding elements in myDynamicGenericList:
myDynamicGenericList .add(someBigDecimal); // Ok!
myDynamicGenericList .add(someString); // Compilation error!Is this possible to achieve?
With best regards/
AC
Message was edited by:
Alecor9

Answer 1

  public static void main(String args[])
    List<BigDecimal> myList = createList(BigDecimal.class);
    myList.add(new BigDecimal("45.00"));
    myList.add(new BigDecimal("82.95"));
    for (BigDecimal bd : myList)
      System.out.println("decimal["+bd.toString()+"]");
  static <T> List<T>  createList(Class<T> someClass)
    List<T> someList = new ArrayList<T>();
    return someList;
  }Or you could do this:
  static <T extends Number> List<T>  createList(Class<T> someClass)
    List<T> someList = new ArrayList<T>();
    return someList;
  }