Cast a Field to a Hashtable

Question

Hi all,
I am learning to use the reflection and have a problem which i dont know how to solve.
I am trying to use the getDeclaredFields() to get all the variables defined in my program. I then do a for loop to go to each of the variables i have fetched from the getDeclaredFields() method. My problem is i dont know how to manipulate the data. (in my example below, i am trying to clear all the data in a hashtable) i cannot do a cast for the Field i got into a Hashtable). Is there any other ways that i can make use to change the data from the Fields that i have fetched ?
my codes are as below :
Class thisClass = getClass();
Field[ ] fieldArray = thisClass.getDeclaredFields();
try {
for(int i=0; i < fieldArray.length; i++) {
((Hashtable)thisClass.getDeclaredField(fieldArray.getName())).clear(); // CASTING ERROR !!!!
catch(Exception e) {
e.printStackTrace();

Answer 1

Field[ ] fieldArray = thisClass.getDeclaredFields();Hi,
A field does only describe the actual field in the class. To get the value e.g. the Hashtable object you have to do:
Hashtable table = (Hashtable) fieldArray[0].get(anObjectOfTheClass);If file[0] is the hashtable-field.
So, now you got all info to re-write you example above :)
/Kaj