Getting key from Hashable

I have a Hashtable object with all the data in it. I have a value and want to get its key from the Hashtable object. I know its the reverse which we normally do - but is this possible? How :confused:

Thanks for your time.

Code:

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import java.util.*;

public class ExpTest {
    public static void main(String[] args) {
        Random seed = new Random();
        int limit = 100;
        String domain = "abcdefghizklmnopqrstuvwxyz";
        // Arrange to save a random value for later lookup.
        String randomValue = null;
        int size = 10;
        int randomIndex = seed.nextInt(size);
        Hashtable<Integer, String> hashTable = new Hashtable<Integer, String>();
        for(int j = 0; j < size; j ++) {
            Integer key = Integer.valueOf(seed.nextInt(limit));
            int index = seed.nextInt(domain.length());
            String value = String.valueOf(domain.charAt(index));
            if(j == randomIndex) {
                randomValue = value;
                System.out.println("randomValue = " + randomValue);
            }
            hashTable.put(key, value);
        }
        // Check keySet and entrySet.
        Set<Integer> keySet = hashTable.keySet();
        System.out.println("keySet = " + keySet);
        Set<Map.Entry<Integer, String>> entrySet = hashTable.entrySet();
        System.out.println("entrySet = " + entrySet);
        // Find the key corresponding to each occurrence of randomValue.
        Enumeration keys = hashTable.keys();
        while(keys.hasMoreElements()) {
            Integer key = (Integer)keys.nextElement();
            String value = (String)hashTable.get(key);
            if(value.equals(randomValue)) {
                System.out.printf("Found key: %d for randomValue: %s%n",
                                  ((Integer)key).intValue(), randomValue);
            }
        }
    }
}

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