Call Dll in Java

public abstract class LimitedAction
{
    /** to hold a time value (methods are inactive while time is a future time) */
    private static long time;
    
    /**
     * sets an inactive state for the specified duration of time
     * @param millis the duration of inactive time in milliseconds */
     */
    public static setDelay(long millis)
    {
        time = System.currentTimeMillis()+millis; // sets time to a future time
    }
    
    /** ensures an active state (or cancels an inactive state) */
    public static setActive()
    {
        time = 0; // sets time to a past time
    }
    
    /** returns the active state */
    public static boolean isActive()
    {
         return time <= System.currentTimeMillis();
    }

public static String getKey()
{
    if (! isActive()) return null;
    return Greenfoot.getKey();
}

public static boolean isKeyDown(String key)
{
    if (! isActive()) return false;
    return Greenfoot.isKeyDown(key);
}

public static boolean mouseClicked(Object obj)
{
    if (! isActive()) return false;
    return Greenfoot.mouseClicked(obj);
}

public abstract class LimitedAction
{
    /** to hold a time value (methods are inactive while time is a future time) */
    private static long time;
     
    /**
     * sets an inactive state for the specified duration of time
     * @param millis the duration of inactive time in milliseconds
     */
    public static void setDelay(long millis)
    {
        time = System.currentTimeMillis()+millis; // sets time to a future time
    }
     
    /** ensures an active state (or cancels an inactive state) */
    public static void setActive()
    {
        time = 0; // sets time to a past time
    }
     
    /** returns the active state */
    public static boolean isActive()
    {
         return time <= System.currentTimeMillis();
    }