Question

好的，这是我建造的应用程序的原型。我已经添加了问题的代码和图像我希望正确的数据显示在正确的列中，因此我在图像中标记为1的应该位于标题下的第二行，我在图像中标记为2应该是在工作室等的第二排。谁能看到我哪里错了？这个应用程序还有其他一些问题，比如JMenuBar，但后来在一个新问题中的地址不好，谢谢！

problems in my app

  //Date :  11-05-2014

  import java.awt.*;
  import java.awt.event.*;
  import javax.swing.*;
  import javax.swing.text.*;

 public class DVD extends JFrame implements ActionListener
 {
     //construct components
    JLabel sortPromt= new JLabel("Sort by:");
    JComboBox fieldCombo= new JComboBox();
    JTextPane textPane = new JTextPane();

    //initalize data in arrays
String title[]={"Casablanca", "Citizen Kane", "Singin in the rain", "The wizzard of Oz"};
String studio[]={"Wanner Brothers", "RKO Pictures", "MGM", "MGM"};
String year[]={"1942", "1941", "1952", "1939"};

 //construct an instance of DVD
 public DVD()
 {
    super("Classic on DVD");
 }
 //create the menu system
 public JMenuBar createMenuBar()
 {
    ///create instance of menu bar
    JMenuBar mnuBar =new JMenuBar();
    setJMenuBar(mnuBar);

    //Construct and Populate the File menu
    JMenu mnuFile = new JMenu("File",true);
        mnuFile.setMnemonic(KeyEvent.VK_F);
        mnuFile.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuFile);

    JMenuItem mnuFileExit =new JMenuItem("Exit");
        mnuFileExit.setMnemonic(KeyEvent.VK_E);
        mnuFileExit.setDisplayedMnemonicIndex(1);
        mnuBar.add(mnuFileExit);
        mnuFileExit.setActionCommand("Exit");
        mnuFileExit.addActionListener(this);

    //construct and pop the edit menu
    JMenu mnuEdit = new JMenu("Edit",true);
        mnuEdit.setMnemonic(KeyEvent.VK_E);
        mnuEdit.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuEdit);

    JMenuItem mnuEditInsert = new JMenuItem("Insert New DVD");
        mnuEditInsert.setMnemonic(KeyEvent.VK_I);
        mnuEditInsert.setDisplayedMnemonicIndex(1);
        mnuBar.add(mnuEditInsert);
        mnuEditInsert.setActionCommand("Insert");
        mnuEditInsert.addActionListener(this);

    JMenu mnuEditSearch = new JMenu("Search",true);
        mnuEditSearch.setMnemonic(KeyEvent.VK_R);
        mnuEditSearch.setDisplayedMnemonicIndex(3);
        mnuEditSearch.add(mnuEditSearch);

    JMenuItem mnuEditSearchByTitle =new JMenuItem("By Title");
        mnuEditSearchByTitle.setMnemonic(KeyEvent.VK_T);
        mnuEditSearchByTitle.setDisplayedMnemonicIndex(3);
        mnuBar.add(mnuEditSearchByTitle);
        mnuEditSearchByTitle.setActionCommand("title");
        mnuEditSearchByTitle.addActionListener(this);

    JMenuItem mnuEditSearchByStudio =new JMenuItem("By Studio");
        mnuEditSearchByStudio.setMnemonic(KeyEvent.VK_S);
        mnuEditSearchByStudio.setDisplayedMnemonicIndex(3);
        mnuBar.add(mnuEditSearchByStudio);
        mnuEditSearchByStudio.setActionCommand("title");
        mnuEditSearchByStudio.addActionListener(this);

    JMenuItem mnuEditSearchByYear =new JMenuItem("By Year");
        mnuEditSearchByYear.setMnemonic(KeyEvent.VK_Y);
        mnuEditSearchByYear.setDisplayedMnemonicIndex(3);
        mnuBar.add(mnuEditSearchByYear);
        mnuEditSearchByYear.setActionCommand("title");
        mnuEditSearchByYear.addActionListener(this);

    return mnuBar;
}//End menu contructor

//Create the conetnt pane
public Container createContentPane()
{
    //populate the jcomboBox
    fieldCombo.addItem("Title");
    fieldCombo.addItem("Studio");
    fieldCombo.addItem("Year");
    fieldCombo.addActionListener(this);
    fieldCombo.setToolTipText("Click the drop-down arow to display sort fields");

    //construct and populate the north panel
    JPanel northPanel = new JPanel();
        northPanel.setLayout(new FlowLayout());
        northPanel.add(sortPromt);
        northPanel.add(fieldCombo);

    //Create the JTextPane  and center Panel
    JPanel centerPanel = new JPanel();
        setTabsAndStyles(textPane);
        textPane = addTextToTextPane();
        JScrollPane scrollPane = new JScrollPane(textPane);
            scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
            scrollPane.setPreferredSize(new Dimension(500, 200));
        centerPanel.add(scrollPane);

    //create container and set attributes
    Container c =  getContentPane();
        c.setLayout(new BorderLayout(10,10));
        c.add(northPanel,BorderLayout.NORTH);
        c.add(centerPanel,BorderLayout.CENTER);

    return c;

}//end create container method

//method to create thtab stops and set fontstyles
protected void setTabsAndStyles(JTextPane textPane)
{
    //create Tab Stops
    TabStop[] tabs = new TabStop[2];
        tabs[0] = new TabStop(200, TabStop.ALIGN_LEFT,TabStop.LEAD_NONE);
        tabs[1] = new TabStop(350, TabStop.ALIGN_LEFT,TabStop.LEAD_NONE);
    TabSet tabset = new TabSet(tabs);

    //set tab style
    StyleContext tabStyle = StyleContext.getDefaultStyleContext();
    AttributeSet aset=
        tabStyle.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet,tabset);
    textPane.setParagraphAttributes(aset, false);

    //set Font Style
    Style fontStyle =
        StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);

    Style regular = textPane.addStyle("regular", fontStyle);
    StyleConstants.setFontFamily(fontStyle, "sansSerif");

    Style s = textPane .addStyle("italic",regular);
    StyleConstants.setItalic(s,true);

    s = textPane .addStyle("blod",regular);
    StyleConstants.setBold(s,true);

    s = textPane .addStyle("lard",regular);
    StyleConstants.setFontSize(s,16);

}

//method to ad text to textpane
public JTextPane addTextToTextPane()
{
    Document doc = textPane.getDocument();
    try
    {
        //clear previous text
        doc.remove(0, doc.getLength());

        //Insert title
        doc.insertString(0,"Title\tStudio\tYear\n",textPane.getStyle("large"));

        //insert detail
        for(int j=0;j<title.length;j++)
        {
            doc.insertString(doc.getLength(),title[j] + "\t",textPane.getStyle("bold"));
            doc.insertString(doc.getLength(),studio[j] + "\t",textPane.getStyle("italic"));
            doc.insertString(doc.getLength(),year[j] + "\t",textPane.getStyle("regular"));
        }//end loop
    } //end try
    catch (BadLocationException ble)
    {
        System.err.println("Couldnlt Insert Text");
    }//end catch
    return textPane;
}///end addtexttotextpane method

public void actionPerformed(ActionEvent e)
{
  String arg = e.getActionCommand();

  //user clicks the sort by combo box
  if(e.getSource() == fieldCombo)
    {
        switch(fieldCombo.getSelectedIndex())
        {
            case 0:
                sort(title);
                break;
            case 1:
                sort(studio);
                break;
            case 2:
                sort(year);
                break;
        }//end swictch
    } //end if

   //user clicks exit on file menu
    if (arg=="Exit")
        System.exit(0);
   //user clicks insert new dvd on edit menu
    if (arg=="insert")
    {
       String newTitle = JOptionPane.showInputDialog(null, "Please enter the moive's title");
       String newStudio = JOptionPane.showInputDialog(null, "Please enter the studio for" + newTitle);
       String newYear = JOptionPane.showInputDialog(null, "Please enter the year for " + newTitle);

        //Enlarge arrays
        title = enlargeArray(title);
        studio = enlargeArray(studio);
        year = enlargeArray(year);

        //add to arrys
        title[title.length-1] = newTitle;
        studio[studio.length-1] = newStudio;
        year[year.length-1] = newYear;

        //call to sort method
        sort(title);
        fieldCombo.setSelectedIndex(0);

    }//end if

    //user clicks title on search submeu
    if(arg=="title")
        search(arg,title);

    //user clicks title on studio submeu
    if(arg=="studio")
        search(arg,studio);

    //user clicks title on year submeu
    if(arg=="year")
        search(arg,year);

}//end of actionPerfomed method

//Method  to enlarge an arry by 1
public String[] enlargeArray(String[]currentArray)
{
    String[]newArray=new String [currentArray.length +1];
    for(int i = 0; i<currentArray.length;i++)
        newArray[i]=currentArray[i];
    return newArray;
}//end enlarg arry method

//method to sort arrays
public void sort(String tempArray[])
{
    //loop to control number of passes
    for(int pass = 1;pass<tempArray.length;pass++)
    {
        for(int element =0 ; element<tempArray.length -1 ;element++)
            if (tempArray[element].compareTo(tempArray[element+1])>0)
            {
                swap(title,element,element+1);
                swap(studio,element, element+1);
                swap(studio,element, element+1);

            }//end if
    }//end of loop
    addTextToTextPane();
}//end of sort method

//method to swap two elements of an array
public void swap(String swapArray[], int first, int second)
{
    String hold;//temp area to hold for swap
    hold = swapArray[first];
    swapArray[first] = swapArray[second];
    swapArray[second] = hold;

} //end swap method

public void search (String searchField, String searchArray[])
{
    try
    {
        Document doc = textPane.getDocument();//assing text to document object
        doc.remove(0,doc.getLength());//clear previous text

        //display colomTitles
        doc.insertString(0,"TITLE\tSTUDIO\tYEAR\n",textPane.getStyle("large"));

        //Prompt users for search data
        String search=JOptionPane.showInputDialog(null, "Please enter the " + searchField);
        boolean found= false;

        //search arrays
        for (int i=0; i<title.length; i++)
        {
            if(search.compareTo(searchArray[i])==0)
            {
                doc.insertString(doc.getLength(),title[i] + "\t", textPane.getStyle("bold"));
                doc.insertString(doc.getLength(),studio[i] + "\t", textPane.getStyle("italic"));
                doc.insertString(doc.getLength(),year[i] + "\t", textPane.getStyle("regular"));
            }//end if
        }//end for
        if (found = false)
        {
         JOptionPane.showMessageDialog(null,"Your search produced no results.", "no results found", JOptionPane.INFORMATION_MESSAGE);
         sort(title);
        }//end if
    }//end try
    catch(BadLocationException ble)
    {
        System.err.println("Couldn't insert text.");
    }//end catch
}//End serach method
//main method executes at runtime
public static void main(String args[])
{
    JFrame.setDefaultLookAndFeelDecorated(true);
    DVD f =new DVD();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setJMenuBar(f.createMenuBar());
    f.setContentPane(f.createContentPane());
    f.setSize(600,375);
    f.setVisible(true);
}//end main method

  }//end dvd class

Answer 1

在方法addTextToTextPane（）中，评论后//插入细节，在doc.insertString（doc.getLength（），year [j] +＆＃34; \ t＆＃34;，textPane.getStyle（＆＃34; regular＆＃34;））; 替换＆＃34; \ t＆＃34;用＆＃34; \ n＆＃34;，移到下一行。

从数组到Java Swing应用程序打印值时，JTextPane会发出问题

1 个答案: