Sir, program is for managing account details using jdbc but ,there error like some variable not accessible in specefic block . Please solve this problem. If you can..
//mypanel1-LogIn
class mypanel1 extends JPanel
{
JTextField t1,t2;
JButton b1,b2;
mypanel1()
{
JLabel l1,l2;
l1=new JLabel("User ID:");
l2=new JLabel("Password:");
t1=new JTextField();
t2=new JTextField();
b1=new JButton("Log In");
b2=new JButton("Exit");

setLayout(flowLayout);
add(l1);
add(t1);
add(l2);
add(l2);
add(t2);
add(b1);
add(b2);
}

}

//mypanel2
class mypanel2 extends JPanel
{
JTextField t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,st;
JLabel l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13,l14,srh ;
JRadioButton rb1,rb2;
JComboBox cb1,cb2;
JButton j1,sb1;
mypanel2()
{
t1=new JTextField();
t2=new JTextField();
t3=new JTextField();
t4=new JTextField();
t5=new JTextField();
t6=new JTextField();
t7=new JTextField();
t8=new JTextField();
t9=new JTextField();
t10=new JTextField();
t11=new JTextField();
t12=new JTextField();
st=new JTextField();

l1= new JLabel("Customer Name:");
l2= new JLabel("Customer ID:");
l3= new JLabel("Flat:");
l4= new JLabel("TEL NO:");
l5= new JLabel("Building:");
l6= new JLabel("Mobile NO:");
l7= new JLabel("Area:");
l8= new JLabel("Pin Code:");
l9= new JLabel("City:");
l10= new JLabel("NO. of Connection:");
l11= new JLabel("Activation Date:");
l12= new JLabel("Subscriber Charges:");
l13= new JLabel("Status:");
l14= new JLabel("Current Balance:");
srh=new JLabel("Search:");

j1=new JButton("Generate Bill");
sb1=new JButton("Search");

rb1=new JRadioButton("Mr.");
rb2=new JRadioButton("Mrs.");


String clist1[]={"Ozar","Nashik","Niphad","NashikRD"};
String clist2[]={"Active","T.disconnected"};


cb1=new JComboBox(clist1);
cb2=new JComboBox(clist2);

setLayout(null);

rb1.setBounds(10,40,60,20);
rb2.setBounds(80,00,60,100);
l1.setBounds(10,100,100,20);
t1.setBounds(110,100,180,20);
l2.setBounds(220,100,80,20);
t2.setBounds(10,100,160,20);
l2.setBounds(320,100,80,20);
t2.setBounds(400,100,80,20);
l3.setBounds(10,135,80,20);
t3.setBounds(110,135,80,20);
l4.setBounds(320,135,80,20);
t4.setBounds(400,135,80,20);
l5.setBounds(10,170,80,20);
t5.setBounds(110,170,100,20);
l6.setBounds(320,170,80,20);
t6.setBounds(400,170,80,20);
l7.setBounds(10,205,80,20);
cb1.setBounds(110,205,140,20);
l8.setBounds(320,205,80,20);
t7.setBounds(400,205,80,20);
l9.setBounds(10,240,80,20);
t8.setBounds(110,240,80,20);
l10.setBounds(280,240,120,20);
t9.setBounds(400,240,40,20);
l11.setBounds(10,280,120,20);
t10.setBounds(110,280,80,20);
l12.setBounds(280,280,120,20);
t11.setBounds(400,280,40,20);
l13.setBounds(10,320,80,20);
cb2.setBounds(110,320,80,20);
l14.setBounds(280,320,100,20);
t12.setBounds(400,320,40,20);

j1.setBounds(150,420,250,20);

srh.setBounds(180,40,150,20);
st.setBounds(230,40,150,20);
sb1.setBounds(400,40,80,20);

add(rb1);add(rb2);add(l1);add(t1);add(l2);add(t2); add(l3);add(t3);
add(l4);add(t4);add(l5);add(t5);add(l6);add(t6);ad d(l7);add(cb1);
add(l8);add(t7);add(l8);add(t8);add(l9);add(l10);a dd(t9);add(l11);add(t10);
add(l12);add(t11);add(l13);add(cb2);add(l14);add(t 12);

add(j1);add(srh); add(st); add(sb1);

}


}
//mypanel3
class mypanel3 extends JPanel
{
JTextField t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14,t15 ,t16,t17;
JLabel l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13,l14,l15 ,l16,l17;
JRadioButton rb1,rb2;
mypanel3()
{
t1=new JTextField(); t2=new JTextField();
t3=new JTextField(); t4=new JTextField();
t5=new JTextField(); t6=new JTextField();
t7=new JTextField(); t8=new JTextField();
t9=new JTextField(); t10=new JTextField();
t11=new JTextField(); t12=new JTextField();
t13=new JTextField(); t14=new JTextField();
t15=new JTextField(); t16=new JTextField();
t17=new JTextField();

l1= new JLabel("Bill no:");
l2= new JLabel("Bill Date:");
l3= new JLabel("Cust Name:");
l4= new JLabel("Cust Id:");
l5= new JLabel("Address:");
l6= new JLabel("Moble:");
l7= new JLabel("bill from Date");
l8= new JLabel("Bill upto:");
l9= new JLabel("Service Tax[%]:");
l10= new JLabel("Education Tax[%]:");
l11= new JLabel("Interest:");
l12= new JLabel("Ent Tax:");
l13= new JLabel("Vat:");
l14= new JLabel("Total amount:");
l15= new JLabel("Cash Mode:");
l16= new JLabel("Deposit:");
l17= new JLabel(");
l17= new JLabel(");


rb1=new JRadioButton("cash.");


rb1=new JRadioButton("Cheq.");
rb2=new JRadioButton("next");
l1.setBounds(70,100,60,20); t1.setBounds(130,100,80,20);
l2.setBounds(340,100,120,20); t2.setBounds(400,100,80,20);
l3.setBounds(40,135,80,20); t3.setBounds(130,135,180,20);
l4.setBounds(350,135,80,20); t4.setBounds(400,135,80,20);
l5.setBounds(60,170,60,20); t5.setBounds(130,170,180,20);
l6.setBounds(350,170,60,20); t6.setBounds(400,170,80,20);
l7.setBounds(30,205,80,20); t7.setBounds(130,205,80,20);
l8.setBounds(340,205,60,20); t8.setBounds(400,205,80,20);
l9.setBounds(20,240,100,20); t9.setBounds(130,240,80,20);
l10.setBounds(280,240,100,20); t10.setBounds(400,240,80,20);
l11.setBounds(60,280,60,20); t11.setBounds(130,280,80,20);
l12.setBounds(340,280,60,20); t12.setBounds(400,280,80,20);
l13.setBounds(80,320,60,20); t13.setBounds(130,320,80,20);
l14.setBounds(30,360,80,20); t14.setBounds(130,360,80,20);
l15.setBounds(320,360,80,20); rb1.setBounds(400,360,80,20);
rb2.setBounds(480,360,80,20); l16.setBounds(60,400,60,20);
t15.setBounds(130,400,80,20); l17.setBounds(300,400,100,20);
t16.setBounds(400,400,80,20);

setLayout(null);

add(l1); add(t1); add(l2); add(t2); add(l3);
add(t3); add(l4); add(t4); add(l5); add(t5);
add(l6); add(t6); add(l7); add(t7); add(l8); add(t8);
add(l9); add(t9); add(l10); add(t10); add(l11);
add(t11); add(l12); add(t12); add(l13); add(l13); add(l14);
add(t14); add(l15); add(rb1); add(rb2); add(l16);
add(t15); add(l17); add(t16);
}
}
class mypanel6 extends JPanel
{
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11;
mypanel6()
{
b1=new JButton("Previous");
b2=new JButton("First");
b3=new JButton("Last");
b4=new JButton("Add New");
b6=new JButton(");
b5=new JButton(");
b7=new JButton("Modify");
b6=new JButton("Delete");
b7=new JButton("Save");
b8=new JButton("Cancel");
b9=new JButton("Back");
b10=new JButton("Back to custmer information window");
b11=new JButton("CTV SYSTEM");


b11.setToolTipText("Error:");

setLayout(new FlowLayout());

add(b1); add(b2); add(b3); add(b4); add(b5);
add(b6); add(b7); add(b8); add(b9); add(b10);
add(b11);
setVisible(true);
}
}

//myframe class
class myframe extends JFrame implements ActionListener
{
Connection cn1;
Statement st1;
ResultSet rs1;
mypanel1 p1;
mypanel2 p2;
mypanel3 p3;
mypanel6 p6;
JLabel msg;
int Flag;
public myframe()
{
super("Database Error");
p1=new mypanel1();
p2=new mypanel2();
p3=new mypanel3();
p6=new mypanel6();

Container c1=getContentPane();
//mypanel4 p4=new mypanel4();
//mypanel5 p5=new mypanel5();

msg=new JLabel();
msg.setBounds(330,360,120,20);
p1.b1.addActionListener(this);
p1.b2.addActionListener(this);
p2.j1.addActionListener(this);
p2.sb1.addActionListener(this);

p6.b1.addActionListener(this); p6.b2.addActionListener(this);
p6.b3.addActionListener(this); p6.b4.addActionListener(this);
p6.b5.addActionListener(this); p6.b6.addActionListener(this);
p6.b7.addActionListener(this); p6.b8.addActionListener(this);
p6.b9.addActionListener(this); p6.b10.addActionListener(this);
p6.b11.addActionListener(this);

//p2.cb1.addItemListener();
//p2.cb2.addItemListener();
c1.add(msg);


add(p1);
//SetDefaultCloseOperation(EXIT_ON_CLOSE);
try
{
setConnection();
enablefields(true);

if(rs1.next())
{
enablebuttons(true);
showfields();
}
else
{
enablebuttons(true);
p6.b8.setEnabled(false);
p6.b9.setEnabled(false);
p6.b5.setEnabled(true);
}
}
catch(Exception e1)
{
JOptionPane.showMessageDialog(this,"Error:"+e1.get Message(),"Database Error",JOptionPane.ERROR_MESSAGE);
}

setSize(900,600);
setVisible(true);

}//myframe constructor
void enablebuttons(boolean Flag)
{
p6.b1.setEnabled(Flag); p6.b2.setEnabled(Flag);
p6.b3.setEnabled(Flag); p6.b4.setEnabled(Flag);
p6.b5.setEnabled(Flag); p6.b6.setEnabled(Flag);
p6.b7.setEnabled(Flag); p6.b8.setEnabled(!Flag);
p6.b9.setEnabled(Flag); p6.b10.setEnabled(Flag);
p6.b11.setEnabled(Flag);
}


void showfields()
{
try
{
p2.t1.setText(rs1.getString(1));
p2.t2.setText(rs1.getString(2));
p2.t3.setText(rs1.getString(3));
p2.t4.setText(rs1.getString(4));
p2.t5.setText(rs1.getString(1));
}
catch(Exception e1)
{
JOptionPane.showMessageDialog(this,"sun.jdbc.odbc. JdbcOdbcDriver"+e1.getMessage(),"jdbc:odbc:mydsn", JOptionPane.ERROR_MESSAGE);
}
}

void enablefields(boolean flag)
{
p2.t1.setEnabled(flag); p2.t2.setEnabled(flag);
p2.t3.setEnabled(flag); p2.t4.setEnabled(flag);
p2.t5.setEnabled(flag); p2.t6.setEnabled(flag);
p2.t7.setEnabled(flag); p2.t8.setEnabled(flag);
p2.t9.setEnabled(flag); p2.t10.setEnabled(flag);
p2.t11.setEnabled(flag); p2.t12.setEnabled(flag);
p2.cb1.setEnabled(flag); p2.cb2.setEnabled(flag);
}

void setConnection()
{
try
{
Class.forName("Connection successful");
Connection cn1=DriverManager.getConnection("select *from customer");
System.out.println("sql error");
st1=cn1.createStatement();
rs1=st1.executeQuery(" error");
}

}
public void actionPerformed(ActionEvent a1)
{
String s1=a1.getActionCommand();
try
{
if(s1.equals(");
}
catch(SQLException e1)
{
System.out.println("))
System.exit(0);
else if(s1.equals(");
}
catch(Exception e1)
{
System.out.println("))
{
String login=p1.t1.getText();

int pass=Integer.parseInt(p1.t2.getText());

if(login.equals("s");
}

}
public void actionPerformed(ActionEvent a1)
{
String s1=a1.getActionCommand();
try
{
if(s1.equals("Log in Successfully"))
System.exit(0);
else if(s1.equals("South"))
{
String login=p1.t1.getText();

int pass=Integer.parseInt(p1.t2.getText());

if(login.equals("Login Fail:Invalid Password"))
{
if(pass==1)
{
//msg.setText("Login Fail:Invalid User ID");
p1.t1.requestFocus();
}
}
else if(s1.equals(");
p1.setVisible(false);
add(p2);
add(p6,"))
{
p2.setVisible(false);
add(p3);
add(p6,"South");
p2.setVisible(true);
msg.setVisible(false);
}
else
msg.setText("Back"))
{
p3.setVisible(false);
add(p2);
p2.setVisible(true);
}
else if(s1.equals(");

}
else
{
msg.setText("))
{System.exit(0);
/*p3.setVisible(false);
add(p2);
p2.setVisible(true);/*/
}

else if(s1.equals("Next");
p1.t1.requestFocus();
}
}
else if(s1.equals("Previous"))
{
p2.setVisible(false);
add(p3);
add(p6,"First");
p3.setVisible(true);
}
else if(s1.equals("Last"))
{
p3.setVisible(false);
add(p2);
p2.setVisible(true);
}
else if(s1.equals("Add new"))
{System.exit(0);
/*p3.setVisible(false);
add(p2);
p2.setVisible(true);/*/
}

else if(s1.equals("None"))
{
if(rs1.next())
showfields();
else
{
rs1.last();
showfields();
}

}
else if(s1.equals("Cancel"))
{
if(rs1.previous())
showfields();
else
{
rs1.first();
showfields();
}

}
else if(s1.equals("Modify"))
{
rs1.first();
showfields();
}

else if(s1.equals("Delete"))
{
rs1.last();
showfields();
}
else if(s1.equals("Save"))
{
enablebuttons(false);
//clearfields();
enablefields(true);
p2.cb1.setSelectedItem("None");
p2.t2.requestFocus();
Flag=1;
}
else if(s1.equals("select class name,"))
{
enablebuttons(true);
enablefields(false);
showfields();
}
else if(s1.equals(",JoptionPane.Information_MESSAGE);
p2.cb1.requestFocus();
}
else
{
String vcname=p2.cb1.getSelectedItem();
}
rs1.updateInt(1,vrno);
rs1.upateString(2,Vsnamne);
sr1.upateInt(3,vm1);
rs1.upateInt(4,vm2);
rs1.upateInt(5,vm3);
rs1.updateString(6,Vcname);
if(Flag==1)
rs1.insertRow();
else
{
rs1.updateRow();
rs1.refreshRow();
}
enablebutton(true);
enablefields(false);
}*/
}
catch(NumberFormatException e1)
{
//JOption.showMessageDialog(this,"))
{
enablebuttons(false);
enablefields(true);
p2.t2.requestFocus();
Flag=1;
}
else if(s1.equals(",JoptionPane.WARNING_MESSAGE);
p2.t3.requestFocus();
}
catch(Exception e1)
{}

}
}
class ctv
{
public static void main(String args[])
{

myframe f=new myframe();
}
}

A stack trace or specific error message would be very very helpful.