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我正在使用 swing 中的 jcombobox 并从 getSelectedIndex 方法获得一些意外输出。当我选择第一个 JComboBox 时，第二个组合框被启用，我使用的方法 getSelectedIndex() 显示了一些意外的输出。我的意思是它应该显示“0”，但它显示“0”，然后是“-1”，然后是一个异常，最后是“0”。我无法弄清楚异常的原因。我在这里只显示部分代码希望你们得到我...

    public Tester() {
            super("Utility for publish_date");
            Container contentpane = getContentPane();
            contentpane.setLayout(new BorderLayout());

            try{
            conn = new MyConn().getMyConnection();
             s = conn.createStatement();
             rs = s.executeQuery("select distinct state_name , state_code from state_master where state_code in (select statecode from pdf_detail) order by state_name");
             statelist.add(0,"Select state");
             while(rs.next())
            {
                statelist.add(rs.getString(1));
                statecodelist.add(rs.getString(2));
            }

             System.out.println("the content of statelist"+ statelist);
           System.out.println("the content of statecodelist"+statecodelist);


             list_state  = new String [statelist.size()];
            statelist.toArray(list_state);


            }catch(Exception e)
            {
                System.out.println(e);
                log(e.getMessage());
            }


            combo = new JComboBox(list_state);
            combo.setBounds(50, 50, 100, 20);
            combo.addActionListener(this);


            combo1 = new JComboBox();
            combo1.addActionListener(this);
            combo1.setEnabled(true);

            combo1.setBounds(50, 100, 100, 20);

            combo2 = new JComboBox();
            combo2.addActionListener(this);
            combo2.setEnabled(true);

            combo2.setBounds(50, 100, 100, 20);

            JPanel panel1 = new JPanel(new FlowLayout());
            panel1.add(combo);
            panel1.add(combo1);
            panel1.add(combo2);
            contentpane.add(panel1 , BorderLayout.NORTH);


          label = new JLabel();
          label.setText("Choose publish Date by selecting below.");
          final SimpleDateFormat dateformater = new SimpleDateFormat("yyyy-MM-dd");

        datepicker = new JXDatePicker();
        datepicker.setFormats(dateformater);

        datepicker.addActionListener(new ActionListener(){

                  public void actionPerformed(ActionEvent e)  {
                       //label.setText(datepicker.getDate().toString());
                     System.out.println("new date is "+dateformater.format(datepicker.getDate()));
                    publish_date =    dateformater.format(datepicker.getDate());

                  }
        });



        JPanel panel2 = new JPanel(new FlowLayout());
        panel2.add(label);
        panel2.add(datepicker);
        contentpane.add(panel2 , BorderLayout.CENTER);




            pbutton = new JButton("Submit");
            pbutton.addActionListener(this);

           JPanel panel3 = new JPanel();
           panel3.add(pbutton);
           contentpane.add(panel3 , BorderLayout.SOUTH);


            setSize(600,150);

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }



    public void actionPerformed(ActionEvent a) 
    {
        if (a.getSource() == combo) {


            statename = (String)combo.getSelectedItem();
            System.out.println("statename======="+statename);
             q = combo.getSelectedIndex();
        System.out.println("....q....."+q);
            System.out.println(",,,,,,,,,,"+statecodelist.get(q-1));

            try{
                districtcodelist.clear();
                ResultSet rs2 =s.executeQuery("select distinct district_name , district_code from district_master where state_code= '"+statecodelist.get(q-1)+"' AND district_code in (select districtcode from pdf_detail where statecode =  '"+statecodelist.get(q-1)+"') order by district_name ");
                //districtlist.add(0, "Select district");
                while(rs2.next())
                {
                    districtlist.add(rs2.getString(1));
                    districtcodelist.add(rs2.getString(2));

                }

                 System.out.println("the content of districtlist"+ districtlist);
                 System.out.println("the content of districtcodelist"+districtcodelist);


                 list_district  = new String [districtlist.size()];
                 districtlist.toArray(list_district);
            }catch(Exception f)
            {
                 f.printStackTrace();
                 System.out.println(f);
                 log(f.getMessage());

            }
            //combo1.setEnabled(true);
            combo1.removeAllItems();
            for (int i = 0; i < list_district.length; i++) {
                     combo1.removeItem(list_district[i]);
                    combo1.addItem(list_district[i]);

            }
            districtlist.clear();
        }

        else if (a.getSource() == combo1)
        {
           // System.out.println("combo1");
            districtname = (String)combo1.getSelectedItem();
            System.out.println("districtname========"+districtname);
             w = combo1.getSelectedIndex();

             if(w == -1)
             {
                 System.out.println("hre is the prob");
                 System.out.println(combo1.getSelectedItem());
             }
            System.out.println(".....w...."+w);
            System.out.println(combo1.getSelectedItem());
            //System.out.println(",,,,,,,,,,"+districtcodelist.get(w));

            try{
                //tehsillist.add(0,"Select tehsil");


                ResultSet rs3 = s.executeQuery("select distinct tehsil_name , tehsil_code from tehsil_master where state_code= '"+statecodelist.get(q-1)+"' AND district_code='"+districtcodelist.get(w)+"' AND tehsil_code in ( select tehsilcode from pdf_detail where statecode =  '"+statecodelist.get(q-1)+"' AND districtcode = '"+districtcodelist.get(w)+"') order by tehsil_name");

                while(rs3.next())
                {
                    tehsillist.add(rs3.getString(1));
                }


                list_tehsil = new String [tehsillist.size()];
                tehsillist.toArray(list_tehsil);


            }catch(Exception g)
            {
             g.printStackTrace();
             log(g.getMessage());
            System.out.println(g);
        }
            //combo2.setEnabled(true);
            combo2.removeAllItems();
            for (int i = 0; i < list_tehsil.length; i++) {
                combo2.removeItem(list_tehsil[i]);
                combo2.addItem(list_tehsil[i]);
        }
            tehsillist.clear();
        }







        if(a.getSource() == pbutton){
             tehsilname = (String)combo2.getSelectedItem();
             e = combo2.getSelectedIndex();
             System.out.println("....e....."+e);
             System.out.println("....w....."+w);

               if((String)combo.getSelectedItem()== "Select state" || (String)combo1.getSelectedItem()== "Select district" || (String)combo2.getSelectedItem()== "Select tehsil" || publish_date == null  )
               {
                  JOptionPane.showMessageDialog(this, "Select all four items first.");
               }
               else 
               {
                 int c = JOptionPane.showConfirmDialog(this,"Do you really want to continue?","update publish date?",JOptionPane.YES_NO_OPTION);
                   if(c==0)
                   {
                   log("State is "+statename+"  \nDistrict is "+districtname+"  \nTehsil is "+tehsilname);
                  try{


              Properties pr =new Properties();
               pr.load(new FileInputStream("config/config.properties"));
              //String publish_date =  pr.getProperty("publish_date");

              ResultSet rs4 = s.executeQuery("select publish_date from pdf_detail where statecode = (select state_code from state_master where state_name = '"+statename+"') AND districtcode = (select district_code from district_master where district_name = '"+districtname+"') AND tehsilcode = (select tehsil_code from tehsil_master where tehsil_name = '"+tehsilname+"') ");

              while(rs4.next())
              {
                  testvalue = rs4.getString(1);

              }
              if(testvalue != null)
              {


                  n = JOptionPane.showConfirmDialog(this,"Publish_date is already assigned to this tehsil. Do you want to update it?","update publish date?",JOptionPane.YES_NO_OPTION);
                 System.out.println("the value of n is "+n);
              }

              if(testvalue == null ||  n == 0)
              {
                 JOptionPane.showMessageDialog(this, "Publish_date updated");  
                  s.executeUpdate("Update pdf_detail set publish_date = '"+publish_date+"'where statecode=(select state_code from state_master where state_name='"+statename+"') AND districtcode=(select district_code from district_master where district_name='"+districtname+"') AND tehsilcode=(select tehsil_code from tehsil_master where tehsil_name='"+tehsilname+"')");
                  log("publish date of "+tehsilname+" is updated from ("+testvalue+") to ("+publish_date+")");
              }
           }catch(Exception e){
               log(e.getMessage());
               System.out.println(e);}

           if(n==1)
           {
              JOptionPane.showMessageDialog(this, "Pulish_date updation canceled");
              log("publish_date process canceled as it is already done");
           }


          JOptionPane.showMessageDialog(this, "Proces completed");
          log("process completed at");
          log("------------------------------------------------------------------------");
         excelLog();


               }
                   else{
                       setVisible(false);
                     (new Publish_Date()).setVisible(true);

                   }

               }
               }    
    }











    public static void main(String args[]) {
             log("process start time");
            (new Tester()).setVisible(true);
    }

}

输出：

....q.....1

.....w....0

....q.....1

.....w....-1

java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.get(Unknown Source)
at com.Publish_Date.itemStateChanged(Publish_Date.java:215)
at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
at javax.swing.JComboBox.selectedItemChanged(Unknown Source)
at javax.swing.JComboBox.contentsChanged(Unknown Source)
at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
at javax.swing.DefaultComboBoxModel.removeElementAt(Unknown Source)
at javax.swing.DefaultComboBoxModel.removeElement(Unknown Source)
at javax.swing.JComboBox.removeItem(Unknown Source)
at com.Publish_Date.itemStateChanged(Publish_Date.java:190)
at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
at javax.swing.JComboBox.selectedItemChanged(Unknown Source)
at javax.swing.JComboBox.contentsChanged(Unknown Source)
at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
at javax.swing.JComboBox.setSelectedItem(Unknown Source)
at javax.swing.JComboBox.setSelectedIndex(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup$1.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$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$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)
java.lang.ArrayIndexOutOfBoundsException: -1

.....w....0
4

2 回答 2

1

当没有选择任何项目时，JComboBox 的选定索引为 -1。如果第二个复选框中的一个项目被选中并且您更改了第一个复选框中的选择，则第二个复选框中的所有项目都将被删除combo1.removeAllItems();，这将导致复选框将其选择更改为 -1 并触发一个事件。

很可能您可以检测到 -1 值并忽略该事件或进行一些清理。

于 2012-07-12T08:16:54.897 回答
0

试试ActionListener

JComboBox<String> jb =  new JComboBox<String>();

jb.add("Vivek"):
jb.add("Vicky");

jb.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {



        System.out.println(jb.getSelectedIndex());
    }
});
于 2012-07-12T06:29:04.257 回答