reading elements in hashtable in an order

[sitaram irrinki]

By default, Hashtable is unordered. Then, how can you retrieve Hashtable
elements in the same order as they are put inside

[Tony Morris]

import java.util.Map;
import java.util.LinkedHashMap;
 
final class X
{
    private X() throws UnsupportedOperationException
    {
        throw new UnsupportedOperationException();
    }
 
    public static void main(final String... args)
    {
        final Map<String, String> m = new LinkedHashMap<String, String>();        
        m.put("a", "b");
        m.put("b", "c");
        m.put("c", "d");
 
        // guarantees output a b c
        for(String key : m.keySet())
        {
            System.out.println(key);
        }
    }
}