JTable does not scroll

Hi
I have a JTabbedPane. One of the panes is a "resultPane" on which I put a "JScrollpaneResult" which keeps a "JScrollPaneTable".
Showhorizonta?SCrollbars are AS_NEEDED
BUT the schrollbar wil bee shown always, and resizing tabelcolumns does not affect the scolling.
I use my own "ResultTableModel" which has these methods
public ResultTableModel() {..}
public synchronized void append(Vector newResult) {
  // some updating ..
     fireTableRowsUpdated(index, index);
public synchronized void clear{..}
public int getColumnCount(){..}
public String getColumnName(int column) {..}
public int getRowCount() {..}
public Object getValueAt(int row, int col){..}
public boolean isCellEditable(int rowIndex, int columnIndex){...}Hanns

Note: You may also want to use table.getRowHeight()
to control the scrolling amount so it scrolls a
single row at a time.Awesome advice (found nowhere else that I looked) that helped me get the stupid scrollpane to programmatically scroll the way I wanted.
Anyone have an explanation of why JComponent::scrollRectToVisible()works better than JViewport::scrollRectToVisible()?
And are Duke Dollars still applicable in the forums?

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  • My JList does not scroll

    hello forum,
    my JList (indentifier=PKGList) does not scroll. Can any look at code and tell me what's the problem. Following is the code. To test this code create two files in same directory. No package statement is there in code.
    1. javaEditor.java
    2. key_words.java
    copy the respective codes. compile these files.
    run command >> java javaEditor .
    Then my GUI will appear. click "new file" from file menu.
    then type "import". press SPACE BAR. a list box will appear conatining list of some packages.
    This is where the problem is [b]. this list box does not sroll.
    at some places,for the ease of identification, i have put the comments..
    ///PAY ATTENTION HERE BEGINS
    and
    ///PAY ATTENTION HERE ENDS .
    I will be thankfull whoever helps me.
    /* javaEditor.java  */
    import javax.swing.*;
    import javax.swing.text.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import java.io.*;
    import java.lang.reflect.*;
    public class javaEditor extends JFrame
         JMenuBar menubar;
         JMenu menu;
         JMenuItem menuitem;
         Container pane;
         Package PKGname;     
         JList PKGlist;
         Vector files;
         Vector PACKAGE;
         static Vector ClassList;
         JTextArea JTA;
         char flag;
         javaEditor()
              super("JavaEditor");
              PACKAGE=new Vector();
              files= new Vector();          
              ClassList=new Vector();
              flag='0';
              pane=getContentPane();          
              pane.setLayout(null);
              window_listener WL=new window_listener(this);
              addWindowListener(WL);
              action_listener AL=new action_listener(this);
              PKGlist=new JList();
              Package pkg[]=Package.getPackages();
              for (int i=0;i<pkg.length;i++)
                   PACKAGE.add(i,pkg.getName());               
              }//for
    [I]
    ///PAY ATTENTION HERE BEGINS
              PKGlist.setListData(PACKAGE);          
              JScrollPane scrollPane = new JScrollPane(PKGlist);
              PKGlist.setAutoscrolls(true);
              pane.add(PKGlist);
    ///PAY ATTENTION HERE ENDS
              ////////////File menu//
              menubar=new JMenuBar();          
              setJMenuBar(menubar);
              menu=new JMenu("File");     
                   menuitem=new JMenuItem("New File");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
                   menuitem=new JMenuItem("Open");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
                   menuitem=new JMenuItem("Save As...");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
              menubar.add(menu);
              menu=new JMenu("Edit");
                   menuitem=new JMenuItem("Cut");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
                   menuitem=new JMenuItem("Copy");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
                   menuitem=new JMenuItem("Paste");
                   menuitem.addActionListener(AL);
                   menu.add(menuitem);
              menubar.add(menu);          
              setJMenuBar(menubar);          
              setDefaultCloseOperation(EXIT_ON_CLOSE);
         }//javaEditor()
         public static void main(String s[])
              javaEditor JE =new javaEditor();
              JE.setSize(500,500);
              JE.setVisible(true);
         }//public static void main(String s[])
         public boolean isClass(String str)
              int i=0;
              System.out.println("searching"+str+" ................");
              while(i<javaEditor.ClassList.size())
                   Class c=(Class)javaEditor.ClassList.elementAt(i);
                   String str1=c.getName();
                   str1=str1.substring(str1.lastIndexOf('.')+1);
                   System.out.println("\t\tMaching with "+str1);
                   if(str1.equals(str))
                        System.out.println("....mached");
                        return true;                    
                   i++;
              return false;
         public Class  findClass(String str)
              int i=0;
              while(i<javaEditor.ClassList.size())
                   Class c=(Class)javaEditor.ClassList.elementAt(i);
                   String str1=c.getName();
                   str1=str1.substring(str1.lastIndexOf('.')+1);
                   if(str1.equals(str))
                        return c;
                   i++;
              return null;
    }//javaEditor extends JFrame
    class action_listener implements ActionListener
         javaEditor JE;
         action_listener (javaEditor JE1)
              JE=JE1;
         public void actionPerformed(ActionEvent e)
              if (e.getActionCommand()=="New File")//adds JTEXT AREA
                   FileOpener file_opener=new FileOpener(JE);
                   file_opener.openNewFile();
                   JE.files.add(FileOpener.counter,file_opener);
              if (e.getActionCommand()=="Open")
                   try
                        JFileChooser chooser = new JFileChooser();               
                        int returnVal = chooser.showOpenDialog(JE);
                        if(returnVal == JFileChooser.APPROVE_OPTION)
                            System.out.println("You chosed to open this file: "+
                             chooser.getSelectedFile().getName());                    
                             FileOpener file_opener=new FileOpener(JE);
                             file_opener.openFile(chooser.getSelectedFile());
                             JE.files.add(FileOpener.counter,file_opener);
                        }//if(returnVal == JFileChooser.APPROVE_OPTION)
                   }//try
                   catch(Exception excptn)
                        System.out.println(excptn);
                   }//catch(Exception excptn)
              if (e.getActionCommand()=="Save As...")
                   try
                        JFileChooser chooser = new JFileChooser();               
                        int returnVal = chooser.showSaveDialog(JE);
                        if(returnVal == JFileChooser.APPROVE_OPTION)
                           System.out.println("You chose to save this file: " +
                                  chooser.getSelectedFile().getName());
                           FileOutputStream fileOS=new FileOutputStream(chooser.getSelectedFile());
                          //String tofile=JTA.getText();
                          //fileOS
                        }//if(returnVal == JFileChooser.APPROVE_OPTION)
                   catch(Exception ex)
              }//if (e.getActionCommand()=="Save As...")          
         }//actionPerformed(ActionEvent e)
    }//action_listener implements ActionListener
    class window_listener extends WindowAdapter
         javaEditor JE;
         window_listener(javaEditor JE1)
              JE=JE1;
    }//window_listener extends WindowAdapter
    class key_listener implements KeyListener
              JTextArea JTA;
              javaEditor JE;
              StringTokenizer str_tok;
              key_listener (JTextArea JTA1,javaEditor JE1)
                   JTA=JTA1;
                   JE=JE1;
          public void keyPressed(KeyEvent e)
               if (e.getSource()==JTA)
                        Character c = new Character(e.getKeyChar());
                        String str= JTA.getText()+c.toString();
                        String str1="hsdk";
                        if(JTA.getCaretPosition()!=0)
                        str=str.substring(0,JTA.getCaretPosition()+1);
                        str_tok=new StringTokenizer(str," \n\r\t;:{}%\\+-*&!.");
                        while(str_tok.hasMoreTokens())
                             str1=str_tok.nextToken();
                        //while(str_tok.hasMoreTokens())
                        if(key_words.isKeyWord(str1))
                             System.out.println("key word "+str1);
                             if(str1.equals("import"))
                                  JE.flag='p';                                             
                             else
                                  JE.flag='k';                                             
                        }//if(key_words.isKeyWord(str1))
                        else if(JE.isClass(str1))
                             System.out.println("class is in list");
                        else if(c.equals(new Character(' '))||c.equals(new Character('.')))
                             Class CLASS;
                             ClassSearch.ifClassAddToList(str1);                                
                             if(JE.isClass(str1))
                                  Method methods[];
                                  System.out.println("searching "+str1+" class into list");
                                  CLASS=JE.findClass(str1);
                                  System.out.println("after finding "+CLASS.getName());
                                  methods=CLASS.getDeclaredMethods();
                                  for(int i=0;i<methods.length;i++)
                                       System.out.println(methods.toString());
                             System.out.println("proceeding............");
                             //CS.start();                    
                        if(JE.flag=='p' && c.equals(new Character(' ')))
                             Caret crt=JTA.getCaret();
                             Point p=crt.getMagicCaretPosition();
    [I]
    ///PAY ATTENTION HERE BEGINS
                             JE.PKGlist.setVisible(true);
                             JE.PKGlist.grabFocus();
                             JE.PKGlist.setOpaque(true);
                             JE.PKGlist.setBackground(new Color(150,150,150));                         
                             JE.PKGlist.setBounds(p.x+JTA.getX()+10,p.y+JTA.getY()+60,50,100);
    ///PAY ATTENTION HERE ENDS
                        }//if(JE.flag=='p' && c.equals(new Character(' ')))
                        if(JE.flag=='C' && c.equals(new Character(' ')))
                        JTA.repaint();
                        JE.pane.repaint();
               }///if e.getSource()
               if (e.getSource()==JE.PKGlist)
                    if(e.getKeyCode()==e.VK_ENTER||e.getKeyCode()==e.VK_SPACE||e.getKeyCode()==e.VK_TAB)
                              JE.PKGlist.setVisible(false);
                              String selectedstr=(String)JE.PKGlist.getSelectedValue();
                              System.out.println(selectedstr);
                              String toAdd=" "+selectedstr+".*;";
                              JTA.insert(toAdd,JTA.getCaretPosition());
                              JTA.grabFocus();
                              JE.flag='0';
                    }//if(e.getKeyCode()==e.VK_ENTER.....
               }//if (e.getSource()==JE.PKGlist)
          public void keyReleased(KeyEvent e){}//keyReleased ends
          public void keyTyped(KeyEvent e){}//keyTyped ends
    class FileOpener
         javaEditor JE;
         static int counter=-1;
         String name;
         JTextArea JTA;
         JInternalFrame  JIF;
         boolean isSaved;
         FileOpener(javaEditor JE1)
              JE=JE1;
              counter++;
              name=new String("NoName-"+Integer.toString(counter)+".java");
              JTA=new JTextArea();          
              isSaved=false;
         }//FileOpener(javaEditor JE1)
         public void openNewFile()
                   JIF=new JInternalFrame(name,true, true, true, true) ;
                   JIF.setBounds(0,10,JE.getWidth(),JE.getHeight()-50);               
                   JTA.setBounds(0,20,JE.getWidth(),JE.getHeight()-50);               
                   key_listener KL=new key_listener(JTA,JE);
                   JTA.addKeyListener(KL);
                   JE.PKGlist.addKeyListener(KL);
                   JIF.getContentPane().add(JTA);               
                   JIF.setVisible(true);
                   JE.pane.add(JIF);
                   JE.repaint();
                   JIF.grabFocus();     
                   JIF.moveToFront();
                   JTA.grabFocus();
         }//openNewFile()
         public void openFile(File file) throws FileNotFoundException,IOException
                   JIF=new JInternalFrame(file.getName(),true, true, true, true) ;
                   JIF.setBounds(0,10,JE.getWidth(),JE.getHeight()-50);               
                   JTA.setBounds(0,20,JE.getWidth(),JE.getHeight()-50);               
                   FileInputStream fileInputStream=new FileInputStream(file);
                   byte buf[]=new byte[fileInputStream.available()];
                   fileInputStream.read(buf);
                   JTA.setText(new String(buf));
                   key_listener KL=new key_listener(JTA,JE);
                   JTA.addKeyListener(KL);
                   JE.PKGlist.addKeyListener(KL);
                   /************************************************************/          JIF.getContentPane().add(JTA);
                   JIF.setVisible(true);
                   JE.pane.add(JIF);
                   JE.repaint();
                   JIF.grabFocus();     
                   JIF.moveToFront();
                   JTA.grabFocus();
         }//openFile(File file)
    }//class FileOpener
    class ClassSearch //extends Thread
         public static  void ifClassAddToList(String str)
              String pkg[]=  new String[77];
              pkg[0]=new String("java.applet.");
              pkg[1]=new String("java.awt.");
              pkg[2]=new String("java.awt.color.");
              pkg[3]=new String("java.awt.datatransfer.");
              pkg[4]=new String("java.awt.dnd.");
              pkg[5]=new String("java.awt.event.");
              pkg[6]=new String("java.awt.font.");
              pkg[7]=new String("java.awt.geom.");
              pkg[8]=new String("java.awt.im.");
              pkg[9]=new String("java.awt.im.spi");
              pkg[10]=new String("java.awt.image.");
              pkg[11]=new String("java.awt.image.renderable");
              pkg[12]=new String("java.awt.print.");
              pkg[13]=new String("java.beans.");
              pkg[14]=new String("java.beans.beancontext.");
              pkg[15]=new String("java.io.");
              pkg[16]=new String("java.lang.");
              pkg[17]=new String("java.lang.ref.");
              pkg[18]=new String("java.lang.reflect.");
              pkg[19]=new String("java.math.");
              pkg[20]=new String("java.net.");
              pkg[21]=new String("java.rmi.");
              pkg[22]=new String("java.rmi.activation.");
              pkg[23]=new String("java.rmi.dgc.");
              pkg[24]=new String("java.rmi.registry.");
              pkg[25]=new String("java.rmi.server.");
              pkg[26]=new String("java.security.");
              pkg[27]=new String("java.security.acl.");
              pkg[28]=new String("java.security.cert.");
              pkg[29]=new String("java.security.interfaces.");
              pkg[30]=new String("java.security.spec.");
              pkg[31]=new String("java.sql.");
              pkg[32]=new String("java.text.");
              pkg[33]=new String("java.util.");
              pkg[34]=new String("java.util.jar.");
              pkg[35]=new String("java.util.zip.");
              pkg[36]=new String("javax.accessibility.");
              pkg[37]=new String("javax.media.sound.midi.");
              pkg[38]=new String("javax.media.sound.midi.spi.");
              pkg[39]=new String("javax.media.sound.sampled.");
              pkg[40]=new String("javax.media.sound.sampled.spi.");
              pkg[41]=new String("javax.naming.");
              pkg[42]=new String("javax.naming.directory.");
              pkg[43]=new String("javax.naming.event.");
              pkg[44]=new String("javax.naming.ldap.");
              pkg[45]=new String("javax.naming.spi.");
              pkg[46]=new String("javax.rmi.");
              pkg[47]=new String("javax.rmi.CORBA.");
              pkg[48]=new String("javax.swing.");
              pkg[49]=new String("javax.swing.border.");
              pkg[50]=new String("javax.swing.colorchooser.");
              pkg[51]=new String("javax.swing.event.");
              pkg[52]=new String("javax.swing.filechooser.");
              pkg[53]=new String("javax.swing.plaf.");
              pkg[54]=new String("javax.swing.plaf.basic.");
              pkg[55]=new String("javax.swing.plaf.metal.");
              pkg[56]=new String("javax.swing.plaf.multi.");
              pkg[57]=new String("javax.swing.table." );
              pkg[58]=new String("javax.swing.text.");
              pkg[59]=new String("javax.swing.text.html.");
              pkg[60]=new String("javax.swing.text.html.parser.");
              pkg[61]=new String("javax.swing.text.rtf.");
              pkg[62]=new String("javax.swing.tree.");
              pkg[63]=new String("javax.swing.undo." );
              pkg[64]=new String("javax.transaction." );
              pkg[65]=new String("org.omg.CORBA." );
              pkg[66]=new String("org.omg.CORBA_2_3." );
              pkg[67]=new String("org.omg.CORBA_2_3.portable." );
              pkg[68]=new String("org.omg.CORBA.DynAnyPackage." );
              pkg[69]=new String("org.omg.CORBA.ORBPackage." );
              pkg[70]=new String("org.omg.CORBA.portable." );
              pkg[71]=new String("org.omg.CORBA.TSIdentificationPackage." );
              pkg[72]=new String("org.omg.CORBA.TypeCodePackage." );
              pkg[73]=new String("org.omg.CORBA.ValueDefPackage." );
              pkg[74]=new String("org.omg.CosNaming." );
              pkg[75]=new String("org.omg.CosNaming.NamingContextPackage." );
              pkg[76]=new String("org.omg.SendingContext." );
              boolean found=false;
              int counter=0;
              Class cl;
              String str1=str;
              while(counter<77&&found==false)
                   try
                        System.out.println("searching for "+str1);                    
                        cl=Class.forName(str1);                    
                        found=true;                    
                        if(javaEditor.ClassList.isEmpty())
                             javaEditor.ClassList.add(0,cl);                    
                             Class c=(Class)javaEditor.ClassList.elementAt(0);
                             System.out.println(c.getName());
                        else
                             javaEditor.ClassList.add(javaEditor.ClassList.size(),cl);
                   catch(Exception e)
                        str1=pkg[counter]+str;
                   counter++;
              return ;
    /*############# key_words.java*/
    public class key_words
         public static boolean isKeyWord(String keyword)
              String list[]= new String[48];
              list[0] = "abstract";
              list[1] = "boolean";
              list[2] = "break";
              list[3] = "byte";
              list[4] = "case";
              list[5] = "catch";
              list[6] = "char";
              list[7] = "class";
              list[8] = "const";
              list[9] = "continue";
              list[10] = "default";
              list[47] = "do";
              list[11] = "double";
              list[12] = "else";
              list[13] = "extends";
              list[14] = "final";
              list[15] = "finally";
              list[16] = "float";
              list[17] = "for";
              list[18] = "goto";
              list[19] = "if";
              list[20] = "implements";
              list[21] = "import";
              list[22] = "instanceof";
              list[23] = "int";
              list[24] = "interface";
              list[25] = "long";
              list[26] = "native";
              list[27] = "new";
              list[28] = "package";
              list[29] = "private";
              list[30] = "protected";
              list[31] = "public";
              list[32] = "return";
              list[33] = "short";
              list[34] = "static";
              list[35] = "strictfp";
              list[36] = "super";
              list[37] = "switch";
              list[38] = "synchronized";
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