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我已經在Netbeans 8.1（Java版本1.8.0_65）中編寫了一個簡單的程序，其中它發現了一個已發現文件的列表並將它們寫入了一個jTextArea。這工作正常，除了有很多行寫入jTextArea（即超過500行左右）時，滾動條中的拇指消失。我看到這個post描述的確切問題。當TextArea有很多行時，JScrollPane不會顯示Nimbus L＆F中的縮略圖
這似乎是一個known issue有雨雲大號& F和鄉親已經發布了這一解決方法如上，他們說，要解決這個問題，只是增加一行在後描述：
UIManager.getLookAndFeelDefaults().put("ScrollBar.minimumThumbSize", new Dimension(30, 30));
問題我的確是在哪裏放這行代碼？我已經嘗試在創建jScrollPanel之前將它添加到initComponents中（如下面的代碼所示）。
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
我清楚地揮舞着剛剛約儘量堅持它不理解我在做什麼不同的地方，並且，沒有：檢查時，如果雨雲可我也已經試過了if語句之後驚喜，不工作。
有人可以幫我確定這種解決方法行代碼應該去哪裏？
我的代碼：
public class ViewFiles extends javax.swing.JFrame {
/**
* Creates new form ViewFiles
*/
public ViewFiles() {
initComponents();
}
public ViewFiles(ArrayList<DiscoveredFile> files){
initComponents();
discoveredFiles = files;
displayFiles();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
javax.swing.UIManager.getLookAndFeelDefaults().put("Scrollbar.minimumThumbSize", new Dimension(30,30));
jScrollPane1 = new javax.swing.JScrollPane();
viewFilesTextArea = new javax.swing.JTextArea();
viewFilesCloseButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
viewFilesTextArea.setColumns(20);
viewFilesTextArea.setRows(5);
jScrollPane1.setViewportView(viewFilesTextArea);
viewFilesCloseButton.setText("Close");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 656, Short.MAX_VALUE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(viewFilesCloseButton)
.addGap(29, 29, 29))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 277, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addComponent(viewFilesCloseButton)
.addContainerGap())
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ViewFiles.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ViewFiles.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ViewFiles.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ViewFiles.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ViewFiles().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JButton viewFilesCloseButton;
private javax.swing.JTextArea viewFilesTextArea;
// End of variables declaration
private ArrayList<DiscoveredFile> discoveredFiles;
public void displayFiles() {
for (DiscoveredFile file : discoveredFiles){
viewFilesTextArea.append(file.getFullPath() + "\n");
}
}
}
* *使用'JList'代替。另請參閱[File Browser GUI]（http://codereview.stackexchange.com/q/4446/7784），瞭解可能提供一些提示的文件瀏覽器（例如，良好的渲染器）。 –
謝謝。我固定了懸掛的括號，並且也會使用jlist。 – Monty
您可能需要查看「Scrollbar.minimumThumbSize」和「ScrollBar.minimumThumbSize」鍵之間的差異。 – aterai