java.lang.NullPointerException

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  • simple piano to play using buttons
    via by Vazzdoin Rocko,
    • java.lang.NullPointerException at test.piano.mousePressed(piano.java:69) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:280) at java.awt.Component.processMouseEvent(Component.java:6104) at javax.swing.JComponent.processMouseEvent(JComponent.java:3287) at java.awt.Component.processEvent(Component.java:5872) at java.awt.Container.processEvent(Container.java:2101) at java.awt.Component.dispatchEventImpl(Component.java:4467) at java.awt.Container.dispatchEventImpl(Container.java:2159) at java.awt.Component.dispatchEvent(Component.java:4293) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4578) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4171) at java.awt.Container.dispatchEventImpl(Container.java:2145) at java.awt.Window.dispatchEventImpl(Window.java:2559) at java.awt.Component.dispatchEvent(Component.java:4293) at java.awt.EventQueue.dispatchEvent(EventQueue.java:604) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177) at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
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