import java.awt.*;
 import java.awt.event.*;
 import java.sql.*;
  public class College implements ActionListener  {   Panel p;  Frame f;
  Button b1,b2,b3,b4,b5,b6,b7;  TextField tf1,tf2,tf3,tf4,tf5,tf6,tf7;
  Label l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13,l14,l15;  GridLayout gl;
  Connection con;
  Statement st;
  String s1,s2,s3,s4,s5,s6,s7,sr1,sr2;
  TextArea ta1;
  College()  {   f=new Frame();
   p=new Panel();
   p.setBackground(Color.cyan);
   gl=new GridLayout(31,8,3,3);
   p.setLayout(gl);
   b1=new Button("Insert");
   b1.addActionListener(this);
      b2=new Button("Select");
   b2.addActionListener(this);
      b3=new Button("Select");
   b3.addActionListener(this);
      b4=new Button("Results");
   b4.addActionListener(this);
   b5=new Button("Select");
   b5.addActionListener(this);
   b6=new Button("Exam");
   b6.addActionListener(this);
   b7=new Button("Submit");
   b7.addActionListener(this);
   tf1=new TextField(50);
   tf1.setBackground(Color.yellow);
   tf2=new TextField(10);
   tf2.setBackground(Color.yellow);
   tf3=new TextField(50);
   tf3.setBackground(Color.yellow);
   tf4=new TextField(20);
   tf4.setBackground(Color.yellow);
   tf5=new TextField(6);
   tf5.setBackground(Color.yellow);
   tf6=new TextField(10);
   tf6.setBackground(Color.yellow);
   tf7=new TextField(10);
   tf7.setBackground(Color.yellow);
   tf8=new TextField(10);
   tf8.setBackground(Color.yellow);
   ta1=new TextArea(10,2);
   l1=new Label("Enter student info");
   l2=new Label("Update student info");
   l3=new Label("View student info");
   l4=new Label("View results");
   l5=new Label("Delete student info");
   l6=new Label("View exam details");
   l7=new Label("Name");
   l8=new Label("Roll");
   l9=new Label("Address");
   l10=new Label("Phone");
   l11=new Label("E-Mail");
   l12=new Label("Gender");
   l13=new Label("Date of Birth");
   l14=new Label("Result");
   l15=new Label("Exam Details");
   p.add(l1);
p.add(b1);
p.add(l2);
p.add(b2);
p.add(l3);
p.add(b3);
p.add(l4);
p.add(b4);
p.add(l5);
p.add(b5);
p.add(l6);
p.add(b6);  
p.add(l7);
p.add(tf1);
p.add(l8);
p.add(tf2);
p.add(l9);
p.add(tf3);
p.add(l10);
p.add(tf4);
p.add(l11);
p.add(tf5);
p.add(l12);
p.add(tf6);
p.add(l13);
p.add(tf7);
p.add(b7);
p.add(l14);
p.add(tf8);
p.add(l15);
p.add(ta1); 
f.add(p);
   f.setSize(100,200);
   f.setVisible(true);
   }  public void actionPerformed(ActionEvent e)  {   if(e.getSource()==b1)  { try {    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");    con=DriverManager.getConnection("jdbc:odbc:Avishek");   
s1=tf1.getText();  
s2=tf2.getText();   
s3=tf3.getText();  
s4=tf4.getText(); 
s5=tf5.getText();   
s6=tf6.getText();   
s7=tf7.getText();   
st=createStatement.executeQuery("insert into Table1 values(?,?,?,?,?,?,?)");   
    st.setString(1,s1);   
st.setString(2,s2);   
st.setString(3,s3); 
st.setString(4,s4);   
st.setString(5,s5);       
st.setString(6,s6);  
st.setString(7,s7);   
st.executeUpdate();  
st.execute();       
st.close();  
}  catch(Exception i)  
{  System.out.println("Error");  
} }      if(e.getSource()==b2)   
{  try  {    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");    con=DriverManager.getConnection("jdbc:odbc:Avishek");       s1=tf1.getText();    s2=tf2.getText();    
st=createStatement.executeQuery("update Table1 set Name=?"+"where Roll=?");
    st.setString(1,s1); 
st.setString(2,s2);   
    st.executeUpdate();   
st.execute();      st.close();  
}   catch(Exception i)   {  
System.out.println("Error");   }  } 
    if(e.getSource()==b3)    {    try     {      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");      con=DriverManager.getConnection("jdbc:odbc:Avishek");    
ResultSet rs=con.createStatement("Select * from Table1"); 
 while(rs.next()) { 
  String s1=rs.Name; 
String s2=rs.Roll; 
String s3=rs.Address;  
String s4=rs.Phone;  
String s5=rs.E-Mail;  
String s6=rs.Gender; 
String s7=rs.Date Of Birth; 
tf1.setText(s1); 
tf2.setText(s2);  
tf3.setText(s3); 
tf4.setText(s4);  
tf5.setText(s5); 
tf6.setText(s6); 
tf7.setText(s7);  
  }                 
rs.close();      } }    catch(Exception i)   {    System.out.println("Error");  
}  }  if(e.getSource()==b4)   
{    try     {   
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");      con=DriverManager.getConnection("jdbc:odbc:Avishek");   
s2=tf2.getText();          
ResultSet rs1=con.createStatement("select from Result where SRoll=?");      while(rs.next())    
{      if(s2.equals(Roll))         
{       String sr1=rs.SRoll;   
String sr2=rs.SResult;     
tf2.setText(sr1);   
tf8.setText(sr2);    
      }    }  
    rs.close();    
 }    catch(Exception i)  
{    System.out.println("Error");  
}  }  if(e.getSource()==b5)   
{    try  
{      s2=tf2.getText();    
st=createStatement.executeQuery("delete from Somu where Roll=?");      st.setString(2,Roll);   
st.executeUpdate();     
st.execute();          
st.close();      } }    catch(Exception i)   
{    System.out.println("Error");   }  }  
if(e.getSource()==b6)  
{     String exam="\nB-Tech 1st sem starts 12.2.2010.\n"+                 "\nB-Com 1st sem starts 10.2.2010.\n"+     
"\nMBA 1st sem starts 15.2.2010.\n";  
ta1.setText(exam);       
      }      }  
public static void main(String args[])  
{   College c=new College();   } }  

In the above program It'd be helpful if the errors could be corrected.Also I'd like to see the pannel change when the buttons are clicked.For example,if Insert is clicked,the panel containing student name,address,ph.,e-mail,gender,date of birth should appear.