制作一个Frame界面显示盘符的东西

import java.awt.BorderLayout;


public class JFramedemo extends JFrame {

	protected static final String LINE_SEPARATOR = System.getProperty("line.separator");
	private JPanel contentPane;
	private JTextField textField;
	private JScrollPane scrollPane;
	private JTextArea textArea;
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					JFramedemo frame = new JFramedemo();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public JFramedemo() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 656, 433);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		textField = new JTextField();
		textField.addKeyListener(new KeyAdapter() {
			@Override
			public void keyPressed(KeyEvent e) {
				if(e.getKeyCode() == KeyEvent.VK_ENTER)
				{
					showdir();
				}
			}
		});
		textField.setBounds(54, 10, 344, 27);
		textField.setFont(new Font("宋体", Font.PLAIN, 18));
		contentPane.add(textField);
		textField.setColumns(30);
		
		JButton btnNewButton = new JButton("转到");
		btnNewButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				showdir();
			}
			
		});
		btnNewButton.setBounds(403, 10, 113, 27);
		contentPane.add(btnNewButton);
		
		scrollPane = new JScrollPane();
		scrollPane.setBounds(54, 50, 462, 323);
		contentPane.add(scrollPane);
		
		textArea = new JTextArea();
		scrollPane.setViewportView(textArea);
	}

	public void showdir() {
		String str = textField.getText();
		File file = new File(str);
		if(file.exists() && file.isDirectory())
		{
			textArea.setText("");
			File file2[] = file.listFiles();
			for(File file3 : file2)
			{
				textArea.append(file3.getName() + LINE_SEPARATOR);
			}
		}
	}
}