-1
Ich versuche Combobox im Dialog basierend auf ID-Nummern von Mitarbeitern anzuzeigen. Wenn der Benutzer eine ID auswählt, zeigt die Anwendung Daten dieser Mitarbeiter an.JComboBox in Dialog
byIdItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
combo = new JComboBox(idNumbers);
String[] options = { "OK", "Cancel"};
int selection = JOptionPane.showOptionDialog(null, combo, "Search",
JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null,
options, options[0]);
if (selection > 0) {
System.out.println("selection is: " + options[selection]);
}
currentItem = ((JComboBox)(e.getSource())).getSelectedIndex();
displayDetails(currentItem);}
});
Als Ergebnis habe ich nur null pointer exception. Vielen Dank im Voraus!
Stack-Trace:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.DefaultComboBoxModel.<init>(DefaultComboBoxModel.java:53)
at javax.swing.JComboBox.<init>(JComboBox.java:175)
at SearchId.initComponents(SearchId.java:37)
at SearchId.<init>(SearchId.java:26)
at EmployeeMenu$6.actionPerformed(EmployeeMenu.java:255)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:389)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
at com.apple.laf.AquaMenuItemUI.doClick(AquaMenuItemUI.java:137)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
at java.awt.Component.processMouseEvent(Component.java:6414)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6179)
at java.awt.Container.processEvent(Container.java:2084)
at java.awt.Component.dispatchEventImpl(Component.java:4776)
at java.awt.Container.dispatchEventImpl(Container.java:2142)
at java.awt.Component.dispatchEvent(Component.java:4604)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4618)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4279)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4209)
at java.awt.Container.dispatchEventImpl(Container.java:2128)
at java.awt.Window.dispatchEventImpl(Window.java:2492)
at java.awt.Component.dispatchEvent(Component.java:4604)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:717)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:676)
at java.awt.EventQueue$2.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:690)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:687)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Was der Stacktrace ist? –
Was ist "idNumbers"? –
Wenn idNumbers gleich null ist, erhalten Sie eine ähnliche Stack-Trace. Auch currentItem = ((JComboBox) (e.getSource())). GetSelectedIndex(); wird nicht den ausgewählten Wertindex der Combo enthalten. e.getSource() ist ein anderes Objekt. – RubioRic