Abstract Class and Interface

abstract class AbstractClass
{
    public abstract void show();
}
interface Interface
{
    void show();
}
public class Test extends AbstractClass implements Interface
{
    public void show()
    {
        System.out.println("my show method");
    }
    public static void main(String[] a)
    {

        AbstractClass ac = new Test();
        ac.show();

        Interface i = new Test();
        ac.show();
    }
}