java.lang.NullPointerException

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  • java.lang.NullPointerException at PianoApplet.paint(PianoApplet.java) at java.awt.Container.update(Container.java:976) at sun.awt.RepaintArea.update(RepaintArea.java:332) at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:195) at java.awt.Component.dispatchEventImpl(Component.java:2658) at java.awt.Container.dispatchEventImpl(Container.java:1208) at java.awt.Component.dispatchEvent(Component.java:2492) at java.awt.EventQueue.dispatchEvent(EventQueue.java:334) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:126) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:93) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:88) at java.awt.EventDispatchThread.run(EventDispatchThread.java:80)
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