线程"AWT-EventQueue-0“中的异常在feedingschedule.FillDemo.fill(FillDemo.java:63) at feedingschedule.FillDemo.actionPerformed(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709)
但是,当我右键单击JList时,我会看到以下内容:Exception in thread "AWT-EventQueue-1" java.lang.NullPointerExceptionjava.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.EventQueue.dispatchEvent(EventQ