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via Oracle Community by 807551, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at Lab8.actionPerformed(Lab8.java:178)	at javax.swing.Timer.fireActionPerformed(Timer.java:271)	at javax.swing.Timer$DoPostEvent.run(Timer.java:201)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:443)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:191)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)