showing illegal start of expression in defining functions of mouselistener interface

import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.util.Vector;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import  javax.swing.text.MaskFormatter;
import java.sql.*;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;


class MyFrame extends JFrame implements  ActionListener,MouseListener{
    Container c;
    JLabel lRollNo,lName,lAge,lMarks;
    JTextField tRollNo,tSName,tMarks;
    JTextField tAge;
    DefaultTableModel mStud;
    JTable tStud;
    JButton bAdd,bNew,bRemove;

    MyFrame(){
                c=getContentPane();
                setLayout(null);
                setTitle("My Frame");
                setSize(800,700);
                setLocation(10,10);

                lRollNo=new JLabel("Roll no");
                lRollNo.setBounds(25,50,100,50);
                c.add(lRollNo);

                lName=new JLabel("Name");
                lName.setBounds(25,150,100,50);
                c.add(lName);

                lAge=new JLabel("Age");
                lAge.setBounds(25,250,100,50);
                c.add(lAge);

                lMarks=new JLabel("Marks");
                lMarks.setBounds(25,350,100,50);
                c.add(lMarks);


                tRollNo=new  JTextField();
                tRollNo.setBounds(150,50,100,50);
                c.add(tRollNo);

                tSName=new  JTextField();
                tSName.setBounds(150,150,100,50);
                c.add(tSName);


                tMarks=new  JTextField();
                tMarks.setBounds(150,350,100,50);
                c.add(tMarks);

                tAge=new  JTextField();
                tAge.setBounds(150,250,100,50);
                c.add(tAge);

                String s[]={"RollNo","SName","Age","Marks"};
                mStud=new DefaultTableModel(s,0);
                tStud=new JTable(mStud);
                JScrollPane jsp= new JScrollPane(tStud);
                jsp.setBounds(315,0,400,500);
                c.add(jsp);
                fillTable();

                bAdd=new JButton("Add");
                bAdd.setBounds(230,525,150,50);
                c.add(bAdd);
                bAdd.addActionListener(this);

                bNew=new JButton("New");
                bNew.setBounds(420,525,150,50);
                c.add(bNew);
                bNew.addActionListener(this);

                bRemove=new JButton("Remove");
                bRemove.setBounds(610,525,150,50);
                c.add(bRemove);
                bRemove.addActionListener(this);




                setVisible(true);
                setDefaultCloseOperation(3);

    }

    public void actionPerformed(ActionEvent ae){
                                                Object o=ae.getSource();
                                                if(o.equals(bAdd)){
            try {
                        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                        Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ=student.mdb");
                        PreparedStatement st=con.prepareStatement("insert into stud Values(?,?,?,?)");

                        st.setInt(1,Integer.parseInt(tRollNo.getText()));
                        st.setString(2,tSName.getText());
                        st.setInt(3,Integer.parseInt(tAge.getText()));
                        st.setInt(4,Integer.parseInt(tMarks.getText()));
                            st.executeUpdate();


                        con.close();

            }
            catch (Exception ex) {
            }

            Vector v=new Vector();
            v.add(Integer.parseInt(tRollNo.getText()));
            v.add(tSName.getText());
            v.add(Integer.parseInt(tAge.getText()));
            v.add(Integer.parseInt(tMarks.getText()));
            mStud.addRow(v);
        }
        else if(o.equals(bNew)){

                                int n=(Integer)mStud.getValueAt(tStud.getSelectedRow(),0); 

                                n++;
                                tRollNo.setText(String.valueOf(n));
                                tSName.setText("");
                                tAge.setText("");
                                tMarks.setText("");
                            }
        else if(o.equals(bRemove)){
            try{
                                int rollno=(Integer)mStud.getValueAt(tStud.getSelectedRow(),0);
                    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                    Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ=student.mdb");
                    PreparedStatement st=con.prepareStatement("delete  from stud where rollno=?");
                    st.setInt(1,rollno);
                    int n=st.executeUpdate();
                    if(n>0)
                        JOptionPane.showMessageDialog(c,"delete");
                        else
                            JOptionPane.showMessageDialog(c,"sorry");               
                            con.close();
            }
                catch(Exception ex){

                                    }


        }
    }
    void fillTable(){
    try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                 Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ=student.mdb");
                 Statement st=con.createStatement();
                 ResultSet rs=st.executeQuery("Select * from stud");
                 while(rs.next())
                 {
                    Vector v=new Vector();
                    v.add(rs.getInt(1));
                          v.add(rs.getString(2));
                           v.add(rs.getInt(3));
                            v.add(rs.getInt(4));
                            mStud.addRow(v);
                 }
                            con.close();


        }
    catch (Exception ex) {
            }

                 }
                 public void mousePressed(MouseEvent me){
    }
    public void mouseClicked(MouseEvent me){
        Object e=me.getSource();
        if(e.equals(tSName)) {
                try {
                        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                        Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ=student.mdb");
                        PreparedStatement st=con.prepareStatement("select sname from stud where rollno=?");
                        st.setInt(1,Integer.parseInt(tSName.getText()));
                        ResultSet rs=null;
                        rs=st.executeQuery();

                        con.close();
            }     
            catch(Exception ex){
            }
    }
    public void mouseReleased(MouseEvent me){ 
    }
    public void mouseEntered(MouseEvent me){
    }
    public void mouseExit(MouseEvent me){
    }
}
    public class DemoDatabase{

    public static void main(String[] args) {
        new MyFrame();
}
    }

Edited 3 Years Ago by Nick Evan: Fixed formatting

in all these lines plz help
public void mouseExit(MouseEvent me){
public void mouseExit(MouseEvent me)

Almost certainly mis-matched { and }. Correct your indentation and it should be obvious.
ps

catch (Exception ex) {
}

is a terrible mistake. When there is an error you are telling Java to throw away the error message and not to tell you anything. Make sure every catch block contains

ex.printStackTrace();

so you know about the errors.

space\DemoDatabase.java:194: illegal start of expression
public void mouseReleased(MouseEvent me){
^
F:\space\DemoDatabase.java:194: illegal start of expression
public void mouseReleased(MouseEvent me){
^
F:\space\DemoDatabase.java:194: ';' expected
public void mouseReleased(MouseEvent me){
^
F:\space\DemoDatabase.java:194: ';' expected
public void mouseReleased(MouseEvent me){
^
F:\space\DemoDatabase.java:196: illegal start of expression
public void mouseEntered(MouseEvent me){
^
F:\space\DemoDatabase.java:196: illegal start of expression
public void mouseEntered(MouseEvent me){
^
F:\space\DemoDatabase.java:196: ';' expected
public void mouseEntered(MouseEvent me){
^
F:\space\DemoDatabase.java:196: ';' expected
public void mouseEntered(MouseEvent me){
^
F:\space\DemoDatabase.java:198: illegal start of expression
public void mouseExit(MouseEvent me){
^
F:\space\DemoDatabase.java:198: illegal start of expression
public void mouseExit(MouseEvent me){
^
F:\space\DemoDatabase.java:198: ';' expected
public void mouseExit(MouseEvent me){
^
F:\space\DemoDatabase.java:198: ';' expected
public void mouseExit(MouseEvent me){
^
F:\space\DemoDatabase.java:206: reached end of file while parsing
}
Process completed.

Edited 3 Years Ago by Nick Evan: Fixed formatting

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