1. 技术文章
  2. The Property Change Event Of Progress Bar Not Firing

The Property Change Event Of Progress Bar Not Firing

由 左心房为你撑大大i 提交于 2019-12-02 07:30:35

问题


I am using JProgressBar for Showing The Progress Of Data Loaded From from DataBase . I am using SwingWorker Class To Load The Data In BackGround Thread using Tutorial!

The Property Change Event of ProgressBar Of my application is not firing.

Please guide me what i am doing wrong???.

Below is the SSCCE of the code i am trying to use is as follows.

public final class JProgressBarApplication {

    //private static org.jdesktop.swingx.JXDatePicker dpDate;
    javax.swing.JPanel pnlDate;
    JLabel label;
    JProgressBar pb;
    boolean taskDone=false;
    LongRunProcess lrpTask;

    public static void main(String... aArgs) {
        JProgressBarApplicationapp = new JProgressBarApplication();
        app.buildAndDisplayGui();
    }

    // PRIVATE //
    private void buildAndDisplayGui() {

        JFrame frame = new JFrame("Test Frame");
        buildContent(frame);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    private static final class showDialog implements ActionListener {

        /**
        * Defining the dialog's owner JFrame is highly recommended.
        */
        showDialog(JFrame aFrame) {    
            Date serverDate = null;
            fFrame = aFrame;    

        }

        public void GetData() {    
        // Code To Get Data From DB    
        }

        public void actionPerformed(ActionEvent aEvent) {

            JOptionPane.showMessageDialog(fFrame, "This is a dialog");
        }
        private JFrame fFrame;
    }

    private void buildContent(JFrame aFrame) {

        JPanel panel = new JPanel();

        panel.add(new JLabel("Hello"));

        JButton ok = new JButton("OK");
        ok.addActionListener(new MinimalSwingApplication.showDialog(aFrame));
        panel.add(ok);

        pb = new JProgressBar(0, 20);
        pb.setValue(0);
        pb.setStringPainted(true);
        aFrame.addWindowListener(new java.awt.event.WindowAdapter() {

            public void windowOpened(java.awt.event.WindowEvent evt) {
                formWindowOpened(evt);
            }
        });
        pb.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
            public void propertyChange(java.beans.PropertyChangeEvent evt) {
                pbPropertyChange(evt);
            }
        });         

        aFrame.getContentPane().add(panel);
        aFrame.getContentPane().add(pb);
        aFrame.getContentPane().add(label);
    }

    private void formWindowOpened(java.awt.event.WindowEvent evt) {

        // TODO add your handling code here:
        lrpTask = new LongRunProcess(this, "1", 0);
        taskDone =false;
        lrpTask.execute();
        lrpTask.addPropertyChangeListener(pb.getPropertyChangeListeners()[0]);
    }

    private void pbPropertyChange(java.beans.PropertyChangeEvent evt) {
        // TODO add your handling code here:
        if (!taskDone) {
            if (lrpTask !=null) {
                int progress = lrpTask.getProgress();
                pb.setValue(progress);
                String str = "<html>" + "<font color=\"#FF0000\">" + "<b>" + 
                String.format( "Completed %d%% of task.\n", progress) + "</b>" + "</font>" + "</html>";
                if (lrpTask.getProgress()==100) {
                    done() ;
                }
            }
        }
    }

    public void done() {
        //Tell progress listener to stop updating progress bar.
        taskDone = true;
        Toolkit.getDefaultToolkit().beep();
        pb.setValue(pb.getMinimum());
        String str = "<html>" + "<font color=\"#FF0000\">" + "<b>" + " Form Loading completed." + "</b>" + "</font>" + "</html>";
        label.setText(str);
    }      
}

class LongRunProcess extends SwingWorker {
    /**
     * @throws Exception
     */
    MinimalSwingApplication frm;
    String mID=null;
    int rowNo=0 ;
    LongRunProcess(MinimalSwingApplication jframe,String mID_,int rowNo_) {
        frm =jframe;
        mID=mID_;
        rowNo=rowNo_ ;
    }
    @Override
    protected Object doInBackground() throws Exception {
        Integer result = 0;               

        try {                        
            frm.GetData();                       
        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }
}

Edit: with @mKorbel answer

I use the following function

 private void getLongRunningTask(String id_ ,int row_){
  final String id=id_;
  final int row=row_;
    Thread process=  new Thread(new Runnable() {
      @Override
        public void run() {
      GetData(id,row);
      }
  });
  process.start();

}

Instead Of using SwingWorker object Before.

  lrpTask = new LongRunProcess(this, "1", 0);
  taskDone =false;
  lrpTask.execute();

Get The following Exceptions 

    debug:
    /JewelleryERPApplication/build/classes/java.lang.ArrayIndexOutOfBoundsException: 8 >= 8
at java.util.Vector.elementAt(Vector.java:470)
at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:294)
at Utilities.Utility.ChangeJTableColumnSize(Utility.java:304)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.RefreshReplicateDetailJTable(RcvGoodsFromFiler.java:2850)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetDetailData(RcvGoodsFromFiler.java:496)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:638)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)
    Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Vector.java:470)
at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:294)
at sun.swing.SwingUtilities2.convertColumnIndexToModel(SwingUtilities2.java:1841)
at javax.swing.JTable.convertColumnIndexToModel(JTable.java:2585)
at javax.swing.JTable.getColumnClass(JTable.java:2701)
at javax.swing.plaf.synth.SynthTableUI$SynthTableCellRenderer.getTableCellRendererComponent(SynthTableUI.java:790)
at javax.swing.JTable.prepareRenderer(JTable.java:5735)
at javax.swing.plaf.synth.SynthTableUI.paintCell(SynthTableUI.java:684)
at javax.swing.plaf.synth.SynthTableUI.paintCells(SynthTableUI.java:581)
at javax.swing.plaf.synth.SynthTableUI.paint(SynthTableUI.java:365)
at javax.swing.plaf.synth.SynthTableUI.update(SynthTableUI.java:276)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at                        javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at   java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 14 >= 0
at java.util.Vector.elementAt(Vector.java:470)
at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:294)
at javax.swing.plaf.basic.BasicTableHeaderUI.paint(BasicTableHeaderUI.java:648)
at javax.swing.plaf.synth.SynthTableHeaderUI.paint(SynthTableHeaderUI.java:173)
at javax.swing.plaf.synth.SynthTableHeaderUI.update(SynthTableHeaderUI.java:144)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at  javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at  java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    Exception in thread "Thread-44" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.removeElementAt(Vector.java:554)
at javax.swing.table.DefaultTableColumnModel.removeColumn(DefaultTableColumnModel.java:151)
at javax.swing.JTable.createDefaultColumnsFromModel(JTable.java:1286)
at javax.swing.JTable.tableChanged(JTable.java:4389)
at javax.swing.JTable.setModel(JTable.java:3691)
at  jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetDetailData(RcvGoodsFromFiler.java:582)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:642)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)
    java.lang.IllegalArgumentException: Identifier not found
at javax.swing.table.DefaultTableColumnModel.getColumnIndex(DefaultTableColumnModel.java:282)
at javax.swing.JTable.getColumn(JTable.java:2564)
at Utilities.Utility.AddingExtraColumnsAndComboForViews(Utility.java:2513)
at Utilities.Utility.RefreshReplicatedDataAndHeader(Utility.java:2307)
at  jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.RefreshReplicateDetailJTable(RcvGoodsFromFiler.java:2804)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetDetailData(RcvGoodsFromFiler.java:496)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:638)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)
    Exception in thread "Thread-49" java.lang.NumberFormatException: For input string: "E2856D+RWN"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at  jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.CalcWeight(RcvGoodsFromFiler.java:774)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:652)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)
    Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 7 >= 1
at java.util.Vector.elementAt(Vector.java:470)
at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:294)
at javax.swing.plaf.synth.SynthTableUI.paintCells(SynthTableUI.java:577)
at javax.swing.plaf.synth.SynthTableUI.paint(SynthTableUI.java:365)
at javax.swing.plaf.synth.SynthTableUI.update(SynthTableUI.java:276)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JViewport.paint(JViewport.java:725)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at  java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    Exception in thread "Thread-50" java.lang.NumberFormatException: For input string: "E2856D+RWN"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.CalcWeight(RcvGoodsFromFiler.java:774)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:652)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)
    Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 8 >= 4
at java.util.Vector.elementAt(Vector.java:470)
at javax.swing.table.DefaultTableColumnModel.getColumn(DefaultTableColumnModel.java:294)
at javax.swing.plaf.synth.SynthTableUI.paintCells(SynthTableUI.java:577)
at javax.swing.plaf.synth.SynthTableUI.paint(SynthTableUI.java:365)
at javax.swing.plaf.synth.SynthTableUI.update(SynthTableUI.java:276)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at  javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    Exception in thread "Thread-56" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.removeElementAt(Vector.java:554)
at javax.swing.table.DefaultTableColumnModel.removeColumn(DefaultTableColumnModel.java:151)
at javax.swing.JTable.createDefaultColumnsFromModel(JTable.java:1286)
at javax.swing.JTable.tableChanged(JTable.java:4389)
at javax.swing.JTable.setModel(JTable.java:3691)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetDetailData(RcvGoodsFromFiler.java:582)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:642)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3323)
at java.lang.Thread.run(Thread.java:722)

Edit For Code Generating Exceptions

Sample Exception1

    .ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.removeElementAt(Vector.java:554)
at javax.swing.table.DefaultTableColumnModel.removeColumn(DefaultTableColumnModel.java:151)
at javax.swing.JTable.createDefaultColumnsFromModel(JTable.java:1286)
at javax.swing.JTable.tableChanged(JTable.java:4389)
at javax.swing.JTable.setModel(JTable.java:3691)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetDetailData(RcvGoodsFromFiler.java:493)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.GetData(RcvGoodsFromFiler.java:638)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler$13.run(RcvGoodsFromFiler.java:3380)

Code At Which Exception occured

    DefaultTableModel dtm = new DefaultTableModel(data_RcvGoodsFromFilerDt, header_RcvGoodsFromFilerDt);

     tblDetailInfo.setModel(dtm);

Sample Exception 2

   Exception in thread "Thread-6" java.lang.NumberFormatException: For input string: "12.950"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at jewelleryerpapplication.GUI.Gold.RcvGoodsFromFiler.CalcWeight(RcvGoodsFromFiler.java:774)

Code At Which Exception occured

   qt += Integer.parseInt( tblDetailInfo.getValueAt(r, 8).toString() );

    Some Exceptions occured at unknown Code Point

    at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)

回答1:


@mKorbel has cited many instructive examples, but the key is invoking setProgress() from the worker's doInBackground(). SwingWorker handles the required synchronization. Several helpful answers expand on the topic in this related Q&A, including a reference to this example.




回答2:


  • You can implement Runnable; it avoids Future and generics, but it is easy to get wrong.

  • This answer compares SwingWorker and Runnable for similar action; SwingWorker has the advantage, but it requires better knowledge about Java Essential Classes.

  • SwingWorker is proper way and is designated for single long running thread; for multithreading, invoke SwingWorker from Executor.

  • Example about SwingWorker.

  • Example about get() exceptions from SwingWorker and PropertyChangeListener.



来源：https://stackoverflow.com/questions/13538275/the-property-change-event-of-progress-bar-not-firing

标签
java
swing
exception
swingworker
jprogressbar
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!