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via Oracle Community by 807551, 1 year ago
This exception has no message.
java.lang.NullPointerException at Tute04.actionPerformed(Tute04.java:337) at java.awt.Button.processActionEvent(Button.java:381) at java.awt.Button.processEvent(Button.java:350) at java.awt.Component.dispatchEventImpl(Component.java:3526) at java.awt.Component.dispatchEvent(Component.java:3367) at java.awt.EventQueue.dispatchEvent(EventQueue.java:445) 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)