mam prosta klase :
import java.applet.*;
public class Dzwiek extends Applet
{
public Dzwiek()
{
muzyczka = getAudioClip( getDocumentBase(), "muzyczka.wav");
}
public void graj()
{
muzyczka.play();
}
AudioClip muzyczka;
}
w innej klasie :
Dzwiek dz = new Dzwiek();
dz.graj();
problem jest taki, ze nic nie odgrywa, zwraca :
xception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.applet.Applet.getDocumentBase(Unknown Source)
at Dzwiek.<init>(Dzwiek.java:7)
at Obsługa_Klawiszy.keyPressed(Obsługa_Klawiszy.java:23)
at java.awt.Component.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Window.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
w czym jest problem ?