public void actionPerformed(ActionEvent e) {
// Invoked when an action occurs.
if (e.getSource().equals(singleSizeUp)) {
singleSize = singleSize * 2;
singleSizeLabel.setText("Image height=" + singleSize);
}
if (e.getSource().equals(singleSizeDown)) {
singleSize = Math.max(64, singleSize / 2);
singleSizeLabel.setText("Image height=" + singleSize);
}
if (e.getSource().equals(seqSizeUp)) {
seqSize = seqSize * 2;
seqSizeLabel.setText("Image height=" + seqSize);
}
if (e.getSource().equals(seqSizeDown)) {
seqSize = Math.max(64, seqSize / 2);
seqSizeLabel.setText("Image height=" + seqSize);
}
}
// event handling
public void actionPerformed(ActionEvent e) {
if (e.getSource() == btnok) {
PreparedStatement pstm;
ResultSet rs;
String sql;
// if no entries has been made and hit ok button throw an error
// you can do this step using try clause as well
if ((tf1.getText().equals("") && (tf2.getText().equals("")))) {
lblmsg.setText("Enter your details ");
lblmsg.setForeground(Color.magenta);
} else {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection connect = DriverManager.getConnection("jdbc:odbc:student_base");
System.out.println("Connected to the database");
pstm = connect.prepareStatement("insert into student_base values(?,?)");
pstm.setString(1, tf1.getText());
pstm.setString(2, tf2.getText());
// execute method to execute the query
pstm.executeUpdate();
lblmsg.setText("Details have been added to database");
// closing the prepared statement and connection object
pstm.close();
connect.close();
} catch (SQLException sqe) {
System.out.println("SQl error");
} catch (ClassNotFoundException cnf) {
System.out.println("Class not found error");
}
}
}
// upon clickin button addnew , your textfield will be empty to enternext record
if (e.getSource() == btnaddnew) {
tf1.setText("");
tf2.setText("");
}
if (e.getSource() == btnexit) {
System.exit(1);
}
}