打开罐子的问题

Question

我在netbeans中制成一个罐子，但是当我双击它时，什么也没发生

C:\Users\itzel\Documents>java -jar ColaDeVuelos.jar
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(Unknown Source)
        at GUI.MenuPrincipal.initComponents(MenuPrincipal.java:110)
        at GUI.MenuPrincipal.<init>(MenuPrincipal.java:30)
        at GUI.MenuPrincipal$5.run(MenuPrincipal.java:184)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unkno

wn来源）

Answer 1

看起来您的代码正在运行并抛出NullPointerException。我想MenuPrincipal.java文件中有错误。

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at GUI.MenuPrincipal$5.run(MenuPrincipal.java:184)