文件游览器无法自动关闭

<strong><span style="font-size: 13px;">import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class FileChoose extends JFrame implements ActionListener { final JFileChooser chooser = new JFileChooser(); final JTextArea area = new JTextArea(); private class FileChooses extends JFrame { public FileChooses(String title) throws IOException { super(title); BufferedReader reader = new BufferedReader(new InputStreamReader( new FileInputStream("D:/txt/系统命令.txt"), "GBK")); String string; while ((string = reader.readLine()) != null) { area.append(string); } reader.close(); add(area); setSize(800, 600); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); } } public FileChoose(String title) { super(title); area.setLineWrap(true); add(chooser); chooser.addActionListener(this); pack(); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); } public static void main(String[] args) { new FileChoose("文件选择器"); } public FileChooses getChooses(String title) throws IOException { return new FileChooses(title); } @Override public void actionPerformed(ActionEvent e) { if (JFileChooser.APPROVE_SELECTION == e.getActionCommand()) { try { File file = chooser.getSelectedFile(); chooser.showOpenDialog(getChooses("打开的文件")); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } setVisible(false); } } </span></strong>