how can I get a linked HashMap
<p>I has a <code>Args</code> class,this class extend <code>HashMap</code> and has some methods:</p>

<pre><code>public class Args extends HashMap{
    public myMethod_1(){
        //...
    }
    public myMethod_2(){
        //...
    }
    public myMethod_3(){
        //...
    }
}
</code></pre>

<p>now,I want to get a Linked <code>Args</code> instance,but exnted <code>LinkedHashMap</code>,</p>

<p>I can't change Args exnteds to <code>LinkedHashMap</code>,also can't change <code>Args</code> to a interfaces</p>

<p>can I get a linked <code>Args</code> instance ? </p>

<p>if not,how the best way to get a <code>LinkedArgs</code>? (not repeat <code>myMethod_1-3</code>)</p>
