Question

I have some data and I have added them to Hashtable in some orders what I want to do now is to get the data in the same order that I have entered

What is the data type that I can use?

Answer 1

Assuming your key is a String you could add some ordering to it and have a getter method for the sorted data. See example below:

    static int order;
    Hashtable map = new Hashtable();

    void put (String key, Object value) {
        map.put(order + key, value);
        order++;
    }

    Enumeration getSorted() {
        Enumeration keys = map.keys();
        Vector sortedKeys = new Vector();

        while (keys.hasMoreElements()) {
            String key = (String) keys.nextElement();
            insertionSort(key, sortedKeys);
        }

        Vector sortedData = new Vector();
        keys = sortedKeys.elements();
        while (keys.hasMoreElements()) {
            String key = (String) keys.nextElement();
            sortedData.addElement(map.get(key));
        }

        return sortedData.elements();
    }

You can find insertionSort algorithms at http://en.wikipedia.org/wiki/Insertion_sort