java - 捕获异常失败

Question

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已关闭 10 年前。

我 try catch ArrayIndexOutOfBoundsException，但它不起作用，我不明白为什么？你能给我一些想法或提示吗？为什么会发生这种情况？

public void actionPerformed(ActionEvent arg0) {
                System.out.println(getSelectedUser());
                try{
                    System.out.println("deleting id:" +Integer.parseInt((String)table.getModel().getValueAt(table.getSelectedRow(), 0)));
                    table.getModel().getValueAt(table.getSelectedRow(), 0)));
                } catch (ArrayIndexOutOfBoundsException e){
                    JOptionPane.showMessageDialog(frmBugSurveilance, "Please select an user!");
                }
                  catch (Exception e){
                JOptionPane.showMessageDialog(frmBugSurveilance, "Please select an user!");
            }

                getUsers();
            }
        });

我需要处理用户没有单击 Jtable 中的某些行的情况...

程序如何崩溃:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.Vector.elementData(Unknown Source)
    at java.util.Vector.elementAt(Unknown Source)
    at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
    at view.AdminGui.getSelectedUser(AdminGui.java:237)
    at view.AdminGui$3.actionPerformed(AdminGui.java:149)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(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$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.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(Unknown Source)

Answer 1

这是因为您的 try block 位于错误的位置。查看此处的堆栈跟踪:

    at view.AdminGui.getSelectedUser(AdminGui.java:237)

请注意，您在 try block 之前调用该方法:

System.out.println(getSelectedUser());

重写为:

try{
    System.out.println(getSelectedUser());
    System.out.println("deleting id:" +Integer.parseInt((String)table.getModel().getValueAt(table.getSelectedRow(), 0)));
    // ...