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>