Textareaボックスのスクロールバーを取得する際の問題

Question

Textareaボックスのスクロールバーを取得する際に問題が発生しました。私のロジックを下に示しました。誰か助けてください。

package swings_new_1stjul; 

import java.awt.BorderLayout; 

import javax.swing.JButton; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTextArea; 
import javax.swing.JTextField; 

public class DHMain extends javax.swing.JFrame 
{  
    private static final long serialVersionUID = 1L; 
    private final static String newline = "\n"; 
    private java.io.File selectedFile; 


     public java.io.File getSelectedFile() { 
      return selectedFile; 
     } 
     public javax.swing.JLabel piclabel; 
     public javax.swing.JTextField samp; 
     public javax.swing.JPanel selectPanel; 
     public javax.swing.JButton verifyButton; 
     public javax.swing.JLabel piclabel1; 
     public javax.swing.JTextArea statusTestbox; 
     public javax.swing.JLabel piclabel2; 
     public javax.swing.JTextArea errorsTestbox; 
     public javax.swing.JScrollPane scrollpane1; 
     public javax.swing.JLabel filenameLabel; 
     public javax.swing.JTextField filenameField; 
     public javax.swing.JButton browseButton; 


    public DHMain() 
    { // method is calling here. 
     initComponents(); 
     setSize(420,250); 
     setResizable(false); 
    } 
// Method to initialize components in the frame. 
    private void initComponents() 
    { 

    setTitle("Welcome to Automated testing tool for Penson"); 

    new javax.swing.JDesktopPane(); 
    selectPanel = new javax.swing.JPanel();  
    filenameLabel=new JLabel("File Name"); 
    piclabel=new JLabel("Procedure Name"); 
    filenameField=new JTextField(23); 
    samp=new JTextField(20); 
    browseButton=new JButton(); 
    verifyButton=new JButton(); 
    piclabel1=new JLabel("Status",(int) LEFT_ALIGNMENT); 
    piclabel2=new JLabel("Errors"); 
    statusTestbox=new JTextArea(5,30); 
    errorsTestbox=new JTextArea(5,30); 
    statusTestbox.setEditable(false); 
    errorsTestbox.setEditable(false); 

    JPanel panel = new JPanel(); 
    JScrollPane scroller = new JScrollPane(panel); 
    this.getContentPane().add(scroller, BorderLayout.CENTER); 

    selectPanel.add(filenameLabel); 
    selectPanel.add(filenameField); 
    selectPanel.add(browseButton); 
    selectPanel.add(piclabel); 
    selectPanel.add(samp); 
    selectPanel.add(verifyButton); 
    selectPanel.add(piclabel1); 
    selectPanel.add(statusTestbox,scrollpane1); 
    selectPanel.add(piclabel2); 
    selectPanel.add(errorsTestbox); 
    add(selectPanel) ;  

    browseButton.setMnemonic('B'); 
    browseButton.setText("Browse"); 

    verifyButton.setMnemonic('V'); 
    verifyButton.setText("Verify"); 



    browseButton.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      browseButtonActionPerformed(evt); 
     } 
    }); 

    verifyButton.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      verifyButtonActionPerformed(evt); 
     } 
    }); 
}  

    private void browseButtonActionPerformed(java.awt.event.ActionEvent evt){ 

     // creating instance for GuiUtils class 

     javax.swing.JFileChooser chooser = GuiUtils.getImageFileChooser(); 
     if(filenameField.getText() != null) 
      chooser.setSelectedFile(new java.io.File(filenameField.getText())); 
     if(chooser.showOpenDialog(this) == javax.swing.JFileChooser.APPROVE_OPTION){ 
      selectedFile = chooser.getSelectedFile(); 
      filenameField.setText(selectedFile.getAbsolutePath()); 
     } 

    } 


    private void verifyButtonActionPerformed(java.awt.event.ActionEvent evt){ 
     int i; 
     for (i=0;i<10;i++) 
     { 

      statusTestbox.append(Integer.toString(i) + newline); 

     } 

    } 

    public static void main(String[] args) {      

     new DHMain().show(true); 

} 

} 

Answer 1

の代わりに

selectPanel.add(statusTestbox,scrollpane1) 

ように見えますが、どのテキスト領域ボックス

scrollpane1=new JScrollPane(statusTestbox); 
selectPanel.add(scrollpane1);