Question

我有一个java应用程序在单独的窗口中打开文件，但菜单栏和框架标题不显示在第二个窗口中。正如您所看到的那样，文件在标题和菜单栏出现的第一个窗口上打开。当我通过单击第一个窗口上的菜单打开文件。该文件在第二个窗口打开，但没有框架标题和菜单栏。有人会告诉我如何解决这个问题吗？提前谢谢。

图像是在窗口 enter image description here

上打开的第一个文件

图像是在单独窗口 enter image description here

上打开的第二个文件

有我的代码：

package PDFAnnotationPackage;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import java.util.*;
import javax.swing.JButton;
import java.awt.Color;
import javax.swing.JTextField;
import PDFAnnotationPackage.WindowMenu.ChildMenuItem;
import com.qoppa.pdf.IEmbeddedFile;
import com.qoppa.pdf.annotations.IAnnotSelectionListener;
import java.io.File;



public class Question extends JFrame implements ActionListener{

public final static  String PDFEXTENSION= "pdf";
private ArrayList<File> fileList=new  ArrayList<File>();
private PDFInternalFrame  internalFrame=null;
private ArrayList<PDFInternalFrame>  lstInternalFrame=new ArrayList<PDFInternalFrame>();


public static void main(String[] args) {
    // TODO Auto-generated method stub
    if (args.length>0){
        Utility.DisplayTestMsg(args[0]);

    }

    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run()
        {               
            new Question();              
        }
    });

}

public Question(File  newFile) {

    String extension=getExtension(newFile);
     if ( PDFEXTENSION.equalsIgnoreCase(extension)){
          AddJPDFNote(newFile);
     }   else{
                     Utility.DisplayWarningMsg("Only PDF File");
           }


    // TODO Auto-generated constructor stub
}
public  Question(){
    super("Question");

            //it is equal to this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {                      
                }
            });


           this.setMinimumSize(new Dimension(400, 500));        
           this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
           this.setExtendedState(JFrame.MAXIMIZED_BOTH);            
           this.setLayout(new BorderLayout());


            // Name the JMenu & Add Items
            JMenu menu = new JMenu("File");
            menu.add(makeMenuItem("Open"));
            menu.add(makeMenuItem("Save"));
            menu.add(makeMenuItem("Save As"));
            menu.add(makeMenuItem("Close"));
            menu.add(makeMenuItem("Print"));
            menu.add(makeMenuItem("Quit"));


            // Add JMenu bar
            JMenuBar menuBar = new JMenuBar();
            menuBar.add(menu);            
            setJMenuBar(menuBar);   
            setVisible(true);          

}
 public void actionPerformed(ActionEvent e) {

        // Menu item actions
        String command = e.getActionCommand().trim();  

        if (command.length()>1){
            menuAction(command);
        } 


    }
  private String getExtension(File file){
       return      file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length());
   }

private JMenuItem makeMenuItem(String name) {
    JMenuItem m = new JMenuItem(name);
    m.addActionListener(this);
    return m;
}

private void menuAction(String command){

        boolean blnGo=false;

             if (command.equals("Quit")) {

             } else if (command.equals("Open")) {
                 // Open menu item action           
                 OpenPDFFile();

             }  else if (command.equalsIgnoreCase("Save")) {


             } else if (command.equalsIgnoreCase("Save As")) {


             }else if (command.equalsIgnoreCase("Close")){

                 }

             else if (command.equalsIgnoreCase("Print")) {
             }

    }      



private void AddJPDFNote(File file){                
    try{                             

         internalFrame = new PDFInternalFrame(file, this.getWidth(), this.getHeight());
         fileList.add(file);
         lstInternalFrame.add(internalFrame);               
         internalFrame.setBounds(0, 0, 600, 100);       
         this.add(internalFrame,BorderLayout.CENTER);
         internalFrame.setVisible(true);

      try {

           internalFrame.setSelected(true);
       }
       catch (java.beans.PropertyVetoException e) {              
           Utility.DisplayExcecptionStrackTrack(e,"MainForm - AddJPDFNote line 401");

       }

       catch(Exception  err){
           Utility.DisplayExcecptionStrackTrack(err,"MainForm - AddJPDFNote line 406");
       }



    }
    catch(Exception  err){
        Utility.DisplayExcecptionStrackTrack(err,"MainForm - AddJPDFNote");


    }
}



private void  OpenPDFFile(){
      JFileChooser fileChooser = new JFileChooser();  
    FileNameExtensionFilter  pdfType=new FileNameExtensionFilter("PDF File (."+ PDFEXTENSION + ")", PDFEXTENSION);
    fileChooser.addChoosableFileFilter(pdfType);
    fileChooser.setFileFilter(pdfType);
  //clear "All files" from dropdown filter box
    fileChooser.setAcceptAllFileFilterUsed(false);

    int returnVal = fileChooser.showOpenDialog(Question.this);
    if (returnVal ==  fileChooser.APPROVE_OPTION) {

        File file = fileChooser.getSelectedFile();           
        String extension =getExtension(file);

        if ( PDFEXTENSION.equalsIgnoreCase(extension)){
          if (fileList.size()==0){

                      AddJPDFNote(file);
                  }
                  else{
                      Question a=new Question(file);
                      a.pack();
                      a.setVisible(true);
                  }
            } else{
             Utility.DisplayWarningMsg("Only PDF File");
            }

    } else if (returnVal == JFileChooser.CANCEL_OPTION ) {
    // Do something else

    } 
  } 




}

Answer 1

您似乎正在调用以File作为参数的构造函数...

Question a=new Question(file);

但在该构造函数中没有任何地方设置框架的标题或设置其菜单栏。

Answer 2

您正在呼叫的按钮操作列表器

Question a=new Question(file);

但是Jmenu项目是在没有参数的构造函数上编写的。所以改变你的construtors如下并尝试，它对我有用

    public Question(File  newFile) {

    String extension=getExtension(newFile);
    if ( PDFEXTENSION.equalsIgnoreCase(extension)){
        AddJPDFNote(newFile);
    }   else{
       // Utility.DisplayWarningMsg("Only PDF File");
    }
    //it is equal to this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
        }
    });


    this.setMinimumSize(new Dimension(400, 500));
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setExtendedState(JFrame.MAXIMIZED_BOTH);
    this.setLayout(new BorderLayout());


    // Name the JMenu & Add Items
    JMenu menu = new JMenu("File");
    menu.add(makeMenuItem("Open"));
    menu.add(makeMenuItem("Save"));
    menu.add(makeMenuItem("Save As"));
    menu.add(makeMenuItem("Close"));
    menu.add(makeMenuItem("Print"));
    menu.add(makeMenuItem("Quit"));


    // Add JMenu bar
    JMenuBar menuBar = new JMenuBar();
    menuBar.add(menu);
    setJMenuBar(menuBar);
    setVisible(true);

    // TODO Auto-generated constructor stub
}
public  Question(){
    //super("Question");
    this(new File(""));
}

enter image description here

在第二个窗口丢失菜单栏中打开JFrame

2 个答案: