首页 文章

我的代码中的Java错误线程“AWT-EventQueue-0”中的异常[重复]

提问于
浏览 次
0

这个问题在这里已有答案：

我正在 Build 一个学生经理并从youtube学到了一切我没有被困在这请求帮助，并给我解决方案代码在下面给出，错误也在下面 .

这是代码 .

public class RegisterStart extends JFrame {

private JPanel contentPane;
private static JTextField uid, fname, lname, sa;
private static JPasswordField pass;
private static JComboBox sq;

private static Connection Conn;
private static ResultSet Rs;
static Properties prop;
static InputStream input;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try 
            {
                RegisterStart frame = new RegisterStart();
                frame.setVisible(true);
                Randomize();

                input = new FileInputStream("/Users/rajat/Programming/EclipseJava/Student Manager/src/config.properties");
                prop.load(input);

                DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());
                Conn = DriverManager.getConnection(prop.getProperty("database"), prop.getProperty("dbuser"), prop.getProperty("dbpassword"));
                Randomize();
            } 
            catch (Exception e) 
            {
                e.printStackTrace();
            }
        }
    });
}


public RegisterStart() {
    setResizable(false);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 600, 440);
    contentPane = new JPanel();
    contentPane.setBackground(new Color(255, 204, 153));
    contentPane.setBorder(null);
    contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);

    JPanel panel = new JPanel();
    panel.setBorder(new EmptyBorder(20, 0, 0, 0));
    panel.setBackground(new Color(255, 204, 153));
    contentPane.add(panel, BorderLayout.NORTH);

    JLabel lblAdminRegistration = new JLabel("ADMIN REGISTRATION");
    lblAdminRegistration.setFont(new Font("Lucida Grande", Font.PLAIN, 20));
    lblAdminRegistration.setBackground(new Color(255, 204, 153));
    panel.add(lblAdminRegistration);

    JPanel panel_1 = new JPanel();
    panel_1.setBackground(new Color(255, 204, 153));
    contentPane.add(panel_1, BorderLayout.CENTER);
    panel_1.setLayout(null);

    JLabel lblNewLabel = new JLabel("USER ID                          :");
    lblNewLabel.setBounds(62, 45, 180, 16);
    panel_1.add(lblNewLabel);

    JLabel lblNewLabel_1 = new JLabel("FIRST NAME                    :");
    lblNewLabel_1.setBounds(62, 83, 180, 16);
    panel_1.add(lblNewLabel_1);

    JLabel lblNewLabel_2 = new JLabel("LAST NAME                     :");
    lblNewLabel_2.setBounds(62, 122, 180, 16);
    panel_1.add(lblNewLabel_2);

    JLabel lblPassworf = new JLabel("PASSWORD                      :");
    lblPassworf.setBounds(62, 164, 180, 16);
    panel_1.add(lblPassworf);

    JLabel lblSecurityQuestions = new JLabel("SECURITY QUESTION        :  ");
    lblSecurityQuestions.setBounds(62, 207, 180, 16);
    panel_1.add(lblSecurityQuestions);

    uid = new JTextField();
    uid.setHorizontalAlignment(SwingConstants.CENTER);
    uid.setBackground(Color.WHITE);
    uid.setEditable(false);
    uid.setBounds(249, 40, 278, 26);
    panel_1.add(uid);
    uid.setColumns(10);

    fname = new JTextField();
    fname.setBounds(249, 78, 278, 26);
    panel_1.add(fname);
    fname.setColumns(10);

    lname = new JTextField();
    lname.setBounds(249, 117, 278, 26);
    panel_1.add(lname);
    lname.setColumns(10);

    sa = new JTextField();
    sa.setBounds(249, 246, 278, 26);
    panel_1.add(sa);
    sa.setColumns(10);

    JLabel lblSecurityAnswer = new JLabel("SECURITY ANSWER            :  ");
    lblSecurityAnswer.setBounds(62, 251, 180, 16);
    panel_1.add(lblSecurityAnswer);

    sq = new JComboBox();
    sq.setModel(new DefaultComboBoxModel(new String[] {"Which is your favorite animal?", "Who is your favorite Actor or Actress?", "Who is your first childhood friend?", "What is your hobby?", "Which is your dream Bike/Car?"}));
    sq.setBounds(249, 203, 283, 27);
    panel_1.add(sq);

    JButton regbutt = new JButton("REGISTER");
    regbutt.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            Register();
        }
    });
    regbutt.setBounds(257, 300, 117, 29);
    panel_1.add(regbutt);

    pass = new JPasswordField();
    pass.setBounds(254, 159, 273, 26);
    panel_1.add(pass);
}

private static void Randomize ()
{
    Random r = new Random (); 
    int a =  r.nextInt(1000000+1);
    uid.setText(a+"");  
}

private static void Register ()
{
    char[] pswrd = pass.getPassword();
    String pass2 = String.valueOf(pswrd);
    Calendar cal1 = new GregorianCalendar();

    java.util.Date CurrDate = cal1.getTime();
    cal1.setTime(CurrDate);
    cal1.add(Calendar.MONTH, 1);

    java.sql.Date SqlDate3 = new java.sql.Date(CurrDate.getTime());
    SimpleDateFormat DMY = new SimpleDateFormat("yyyy-mm-dd");
    DMY.format(SqlDate3);

    try 
    {
        int x=0;
        System.out.println(x++);
        PreparedStatement ps = Conn.prepareStatement("insert into admin_database values (?,?,?,?,?,?,?)");
        System.out.println(x++);
        ps.setInt(1, Integer.parseInt(uid.getText()));
        System.out.println(x++);
        ps.setString(2, fname.getText());
        System.out.println(x++);
        ps.setString(3, lname.getText());
        System.out.println(x++);
        ps.setString(4, pswrd.toString());
        System.out.println(x++);
        ps.setString(5, sq.getSelectedItem().toString());
        System.out.println(x++);
        ps.setString(6, sa.getText());
        System.out.println(x++);
        ps.setDate(7, SqlDate3);
        System.out.println(x++);

        int i = ps.executeUpdate();
        JOptionPane.showMessageDialog(null, "Thanks for Registering your UserID is "+uid.getText());
    } 
    catch (SQLException e) 
    {
        e.printStackTrace();
    }
}
}

这是我得到的错误 .

java.desktop / java.awt中java.desktop / java.awt.event.InvocationEvent.dispatch（InvocationEvent.java:313）处的frames.RegisterStart $ 1.run（RegisterStart.java:58）中的java.lang.NullPointerException . java.desktop上的EventQueue.dispatchEventImpl（EventQueue.java:770）/ java.desktop / java.awt.EventQueue.access $ 600（EventQueue.java:97）java.desktop / java.awt.EventQueue $ 4.run（EventQueue.java:721）在java.desktop / java.awt.EventQueue中的$ 4.run（EventQueue.java:715）在java.base / java.security.AccessController.doPrivileged（本机方法）在java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege （ProtectionDomain.java:87）在java.desktop / java.awt.EventQueue.dispatchEvent（EventQueue.java:740）在java.desktop / java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:203）在java.desktop / java.deskt的java.desktop / java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:113）中的java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:124） op / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:109）位于java.desktop / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:101），位于java.desktop / java.awt.EventDispatchThread.run（EventDispatchThread . java：90）0在线程“AWT-EventQueue-0”中的异常java.lang.NullPointerException at frames.RegisterStart.Register（RegisterStart.java:190）at frames.RegisterStart.access $ 2（RegisterStart.java:171）at frames.RegisterStart $ 2.actionPerformed（RegisterStart.java:153）java.desktop / javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java:1967）at java.desktop / javax.swing.AbstractButton $ Handler.actionPerformed（AbstractButton.java:2308） at java.desktop / javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:405）at java.desktop / javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java:262）at java.desktop / javax.swing.plaf.basic .BasicButtonListener.mouseReleased（BasicButtonListener.java:270）at java.desktop / java.awt.Component.processMo java.desktop上java.desktop / java.awt.Component.processEvent（Component.java:6354）的java.desktop / javax.swing.JComponent.processMouseEvent（JComponent.java:3342）中的useEvent（Component.java:6589） /java.awt.Container.processEvent(Container.java:2261）在java.desktop / java.awt.Component.dispatchEventImpl（Component.java:4966）java.desktop / java.awt.Container.dispatchEventImpl（Container.java） ：2319）位于java.desktop / java.awt上的java.desktop / java.awt.Component.dispatchEvent（Component.java:4798）java.desktop / java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4914） . LightweightDispatcher.processMouseEvent（Container.java:4543）在java.desktop / java.awt.LightweightDispatcher.dispatchEvent（Container.java:4484）在java.desktop / java.awt.Container.dispatchEventImpl（Container.java:2305）在java的java.desktop / java.awt.EventQueue.dispatchEventImpl（EventQueue .jav a：772）java.desktop / java.awt.EventQueue.access $ 600（EventQueue.java:97）java.desktop / java.awt.EventQueue $ 4.run（EventQueue.java:721）at java.desktop / java .awt.EventQueue $ 4.run（EventQueue.java:715）at java.base / java.security.AccessController.doPrivileged（Native Method）at java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:87 ）维持在java.desktop / java.awt.EventQueue中的$ 5.run（EventQueue.java:745）java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:97）在java.desktop / java.awt中java.base / java.security.ProtectionDomain上的java.base / java.security.AccessController.doPrivileged（Native Method）中的.EventQueue $ 5.run（EventQueue.java:743）$ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:87）at at java.desktop / java.awt.EventQueue.dispatchEvent（EventQueue.java:742）java.des上的java.desktop / java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:203） java.desktop / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread . java：109）at java.desktop / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:101）at java.desktop / java.awt.EventDispatchThread.run（EventDispatchThread.java:90)2018-08-15 22:28 ：31.367 java [699：58449]查找：[LULookupDefinitionModule]中捕获的未处理异常'JavaNativeException'_focusTermUsingQueue：处理器：]

java swing nullpointerexception awt-eventqueue

1 回答

  • 0

    我解决了我的问题，我刚改变了属性道具; to Properties prop = new Properties（）;

    public class RegisterStart extends JFrame {

    private JPanel contentPane;
    private static JTextField uid, fname, lname, sa;
    private static JPasswordField pass;
    private static JComboBox sq;

    private static Connection Conn;
    private static ResultSet Rs;
    static Properties prop = new Properties();
    static InputStream input = null;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try 
                {
                    RegisterStart frame = new RegisterStart();
                    frame.setVisible(true);
                    Randomize();

                    input = new FileInputStream("/Users/rajat/Programming/EclipseJava/Student Manager/src/config.properties");
                    prop.load(input);

                    DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());
                    Conn = DriverManager.getConnection(prop.getProperty("database"), prop.getProperty("dbuser"), prop.getProperty("dbpassword"));
                    Randomize();
                } 
                catch (Exception e) 
                {
                    e.printStackTrace();
                }
            }
        });
    }


    public RegisterStart() {
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 600, 440);
        contentPane = new JPanel();
        contentPane.setBackground(new Color(255, 204, 153));
        contentPane.setBorder(null);
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JPanel panel = new JPanel();
        panel.setBorder(new EmptyBorder(20, 0, 0, 0));
        panel.setBackground(new Color(255, 204, 153));
        contentPane.add(panel, BorderLayout.NORTH);

        JLabel lblAdminRegistration = new JLabel("ADMIN REGISTRATION");
        lblAdminRegistration.setFont(new Font("Lucida Grande", Font.PLAIN, 20));
        lblAdminRegistration.setBackground(new Color(255, 204, 153));
        panel.add(lblAdminRegistration);

        JPanel panel_1 = new JPanel();
        panel_1.setBackground(new Color(255, 204, 153));
        contentPane.add(panel_1, BorderLayout.CENTER);
        panel_1.setLayout(null);

        JLabel lblNewLabel = new JLabel("USER ID                          :");
        lblNewLabel.setBounds(62, 45, 180, 16);
        panel_1.add(lblNewLabel);

        JLabel lblNewLabel_1 = new JLabel("FIRST NAME                    :");
        lblNewLabel_1.setBounds(62, 83, 180, 16);
        panel_1.add(lblNewLabel_1);

        JLabel lblNewLabel_2 = new JLabel("LAST NAME                     :");
        lblNewLabel_2.setBounds(62, 122, 180, 16);
        panel_1.add(lblNewLabel_2);

        JLabel lblPassworf = new JLabel("PASSWORD                      :");
        lblPassworf.setBounds(62, 164, 180, 16);
        panel_1.add(lblPassworf);

        JLabel lblSecurityQuestions = new JLabel("SECURITY QUESTION        :  ");
        lblSecurityQuestions.setBounds(62, 207, 180, 16);
        panel_1.add(lblSecurityQuestions);

        uid = new JTextField();
        uid.setHorizontalAlignment(SwingConstants.CENTER);
        uid.setBackground(Color.WHITE);
        uid.setEditable(false);
        uid.setBounds(249, 40, 278, 26);
        panel_1.add(uid);
        uid.setColumns(10);

        fname = new JTextField();
        fname.setBounds(249, 78, 278, 26);
        panel_1.add(fname);
        fname.setColumns(10);

        lname = new JTextField();
        lname.setBounds(249, 117, 278, 26);
        panel_1.add(lname);
        lname.setColumns(10);

        sa = new JTextField();
        sa.setBounds(249, 246, 278, 26);
        panel_1.add(sa);
        sa.setColumns(10);

        JLabel lblSecurityAnswer = new JLabel("SECURITY ANSWER            :  ");
        lblSecurityAnswer.setBounds(62, 251, 180, 16);
        panel_1.add(lblSecurityAnswer);

        sq = new JComboBox();
        sq.setModel(new DefaultComboBoxModel(new String[] {"Which is your favorite animal?", "Who is your favorite Actor or Actress?", "Who is your first childhood friend?", "What is your hobby?", "Which is your dream Bike/Car?"}));
        sq.setBounds(249, 203, 283, 27);
        panel_1.add(sq);

        JButton regbutt = new JButton("REGISTER");
        regbutt.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Register();
            }
        });
        regbutt.setBounds(257, 300, 117, 29);
        panel_1.add(regbutt);

        pass = new JPasswordField();
        pass.setBounds(254, 159, 273, 26);
        panel_1.add(pass);
    }

    private static void Randomize ()
    {
        Random r = new Random (); 
        int a =  r.nextInt(1000000+1);
        uid.setText(a+"");  
    }

    private static void Register ()
    {
        char[] pswrd = pass.getPassword();
        String pass2 = String.valueOf(pswrd);
        Calendar cal1 = new GregorianCalendar();

        java.util.Date CurrDate = cal1.getTime();
        cal1.setTime(CurrDate);
        cal1.add(Calendar.MONTH, 1);

        java.sql.Date SqlDate3 = new java.sql.Date(CurrDate.getTime());
        SimpleDateFormat DMY = new SimpleDateFormat("yyyy-mm-dd");
        DMY.format(SqlDate3);

        try 
        {
            PreparedStatement ps = Conn.prepareStatement("insert into admin_database values (?,?,?,?,?,?,?)");
            ps.setInt(1, Integer.parseInt(uid.getText()));
            ps.setString(2, fname.getText());
            ps.setString(3, lname.getText());
            ps.setString(4, pswrd.toString());
            ps.setString(5, sq.getSelectedItem().toString());
            ps.setString(6, sa.getText());
            ps.setDate(7, SqlDate3);

            int i = ps.executeUpdate();
            JOptionPane.showMessageDialog(null, "Thanks for Registering your UserID is "+uid.getText());
        } 
        catch (SQLException e) 
        {
            e.printStackTrace();
        }
    }
}
    回复于

相关问题