Java GUI textfield+JOptionPane

TextField textField_1 = new TextField();

textField_1.setEchoChar('*');

/**
完整執行個體源代碼
*/
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

import java.awt.Toolkit;

import javax.swing.JTextField;

import edu.gzu.stuManager.Dao.UserLoginValid;
import edu.gzu.stuManager.Domain.StudentInfo;
import edu.gzu.stuManager.View.StudentMainView;

import java.awt.Choice;
import java.awt.Font;
import java.awt.Button;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class MainUI {

	private JFrame frame;
	private JTextField textField;
	private JTextField textField_1;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MainUI window = new MainUI();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public MainUI() {
		initialize();
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		frame = new JFrame();
		frame.setTitle("\u6210\u7EE9\u7BA1\u7406\u7CFB\u7EDF\uFF08\u767B\u5F55\uFF09");
		frame.setIconImage(Toolkit.getDefaultToolkit().getImage(MainUI.class.getResource("/image/func_list7_privmana.png")));
		frame.setBounds(400, 250, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		
		JLabel lblNewLabel = new JLabel("\u5B66\u751F\u6210\u7EE9\u7BA1\u7406\u7CFB\u7EDF\u7528\u6237\u767B\u5F55\uFF01");
		lblNewLabel.setFont(new Font("宋體", Font.PLAIN, 16));
		lblNewLabel.setBounds(111, 17, 287, 15);
		frame.getContentPane().add(lblNewLabel);
		
		JLabel lblNewLabel_1 = new JLabel("\u7528\u6237\u540D\uFF1A");
		lblNewLabel_1.setFont(new Font("宋體", Font.PLAIN, 14));
		lblNewLabel_1.setBounds(87, 67, 67, 15);
		frame.getContentPane().add(lblNewLabel_1);
		
		textField = new JTextField();
		textField.setBounds(154, 64, 141, 21);
		frame.getContentPane().add(textField);
		textField.setColumns(10);
		
		JLabel label = new JLabel("\u5BC6  \u7801\uFF1A");
		label.setFont(new Font("宋體", Font.PLAIN, 14));
		label.setBounds(87, 108, 67, 15);
		frame.getContentPane().add(label);
		
		textField_1 = new JTextField();
		textField_1.setColumns(10);
		textField_1.setBounds(154, 103, 141, 21);
		frame.getContentPane().add(textField_1);
		
		JLabel lblNewLabel_2 = new JLabel("\u6211\u7684\u8EAB\u4EFD\u662F\uFF1A");
		lblNewLabel_2.setFont(new Font("宋體", Font.PLAIN, 14));
		lblNewLabel_2.setBounds(105, 150, 97, 15);
		frame.getContentPane().add(lblNewLabel_2);
		
		final Choice choice = new Choice();
		choice.setBounds(210, 147, 74, 21);
		choice.add("學生");
		choice.add("教師");
		choice.add("系統管理者");
		frame.getContentPane().add(choice);
		
		Button button = new Button("\u767B\u5F55");
		button.setBounds(87, 194, 76, 23);
		button.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				String user=textField.getText();
				String password=textField_1.getText();
				String shenfen=choice.getSelectedItem();
				if(user.equals("")||user==null){
					JOptionPane.showMessageDialog(frame, shenfen+":您好，帳号不能為空！");
					return;
				}else if(password.equals("")||password==null){
					JOptionPane.showMessageDialog(frame, shenfen+":您好，密碼不能為空！");
					return;
				}else{
					StudentInfo stu=new StudentInfo(Integer.parseInt(user),
							Integer.parseInt(password),shenfen);
					UserLoginValid dao=new UserLoginValid();
					String result=dao.isValid(stu);
					
					if("登入成功！".equals(result)){
						JOptionPane.showMessageDialog(frame,result);
						StudentMainView index=new StudentMainView(stu);
						JFrame frame2=index.getFrame();
						frame2.setVisible(true);
						frame.dispose();
					}else{
						JOptionPane.showMessageDialog(frame,result);
					}
					
				}
			}
		});
		frame.getContentPane().add(button);
		
		Button button_1 = new Button("\u53D6\u6D88");
		button_1.setBounds(219, 194, 76, 23);
		frame.getContentPane().add(button_1);
		
		
	}

}
           

JOptionPane.showMessageDialog(frame, shenfen+":您好，帳号不能為空！");