如何在swt desiger中实现button的清空与登录功能

[sunyraindrop]

如何在swt desiger中实现button的清空与登录功能即如何修改下列代码

package com.accp.zxt;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Mine extends JFrame {


private JPasswordField passwordField;
private JTextField textField;
/**
* Launch the application
* @param args
*/
public static void main(String args[]) {
try {
Mine frame = new Mine();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* Create the frame
*/
public Mine() {
super();
getContentPane().setLayout(null);
setBounds(100, 100, 257, 313);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});


button.setText("登录");
button.setBounds(56, 197, 57, 23);
getContentPane().add(button);

final JButton button_1 = new JButton();
button_1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {



}
});
button_1.setText("清空");
button_1.setBounds(135, 197, 57, 23);
getContentPane().add(button_1);

textField = new JTextField();
textField.setBounds(107, 60, 85, 23);
getContentPane().add(textField);

passwordField = new JPasswordField();
passwordField.setBounds(107, 112, 85, 23);
getContentPane().add(passwordField);

final JLabel label = new JLabel();
label.setText("用户名");
label.setBounds(56, 60, 45, 23);
getContentPane().add(label);

final JLabel label_1 = new JLabel();
label_1.setText("密 码");
label_1.setBounds(56, 116, 45, 15);
getContentPane().add(label_1);
//
}

}

[craky]

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class LoginDemo extends Shell
{

    private Text txtPsd;

    private Text txtUser;

    /**
     * Launch the application
     * @param args
     */
    public static void main(String args[])
    {
        try
        {
            Display display = Display.getDefault();
            LoginDemo shell = new LoginDemo(display, SWT.SHELL_TRIM);
            shell.open();
            shell.layout();
            
            while(!shell.isDisposed())
            {
                if(!display.readAndDispatch())
                {
                    display.sleep();
                }
            }
            
            display.dispose();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * Create the shell
     * @param display
     * @param style
     */
    public LoginDemo(Display display, int style)
    {
        super(display, style);
        createContents();
    }

    /**
     * Create contents of the window
     */
    protected void createContents()
    {
        setText("SWT Application");
        setSize(416, 279);

        final Label lbUser = new Label(this, SWT.NONE);
        lbUser.setText("用户名");
        lbUser.setBounds(45, 80, 52, 21);

        final Label lbPsd = new Label(this, SWT.NONE);
        lbPsd.setText("密  码");
        lbPsd.setBounds(45, 120, 52, 21);

        txtUser = new Text(this, SWT.BORDER);
        txtUser.setBounds(103, 75, 260, 25);

        txtPsd = new Text(this, SWT.BORDER);
        txtPsd.setEchoChar('*');
        txtPsd.setBounds(103, 113, 260, 25);

        final Button btnLogin = new Button(this, SWT.NONE);
        btnLogin.addSelectionListener(new SelectionAdapter()
        {
            public void widgetSelected(final SelectionEvent e)
            {
                
            }
        });
        btnLogin.setText("登陆");
        btnLogin.setBounds(80, 191, 84, 25);

        final Button btnClear = new Button(this, SWT.NONE);
        btnClear.addSelectionListener(new SelectionAdapter()
        {
            public void widgetSelected(final SelectionEvent e)
            {
                
            }
        });
        btnClear.setText("清空");
        btnClear.setBounds(244, 191, 84, 25);
        //
    }

    @Override
    protected void checkSubclass()
    {
    // Disable the check that prevents subclassing of SWT components
    }
}