String into date format

Question

Hi
I was wondering if anyone knew how to convert a string into different formats,
to enable it to be stored in a mysql db.
I was wondering anyone you knew how to convert:
- String into the date format yyyy-mm--dd
- String into time format 00:00:00
- string to double
Ive tried:
c_date = java.sql.Date.valueOf(f_date);
System.out.println("conversion data: " +c_date);
c_time = java.sql.Time.valueOf(f_time);
System.out.println(" time converted data: "+c_time);
// string to double conversion
c_change = java.lang.Double.valueOf(f_change);
System.out.println(c_change);
My class doesnt execute this at all?
Also,
SimpleDateFormat sdft = new SimpleDateFormat("yyyy-MM-dd");
c_date = sdft.format(f_date);
System.out.println(c_date);
.. but this method returns the error incompatible types?
Any suggestions would be helpful.. thanks in advance..

Answer 1

Friends i've got similar kind of problem...can you help me
here is my code. When i try to print the user entered date (dd/MM/yyyy)(which i am storing in a string) the program dispalys nothing. and everey time i enter a valid date it displas "invalid From date entered ". I need to store the user entered date into a string because i need that for further use. All my intesion is to get two dates from user in dd/MM/yyyy. Strore them in certain variable. Check if they are valid or not. and make sure todate is either equal or greater than fromdate. Please help me to solve this problem.
public class EDTDateValidation extends JFrame implements ActionListener{
private JLabel fromlabel;
private JLabel tolabel;
private JTextField fromtxt;
private JTextField totxt;
private String fmt ="dd/MM/yyyy";
private java.lang.String fromdate;
private java.lang.String todate;
private JButton buttonOK;
private JButton buttonCancel;
private Date theDate;
private Date date1;
private Date date2;
private JPanel mainPanel;
SimpleDateFormat dtformat = new SimpleDateFormat(fmt);
public EDTDateValidation(){
super("Date Validation");
dtformat.setLenient(false);
mainPanel=new JPanel();
mainPanel.setLayout(null);
fromlabel = new JLabel("From Date");
tolabel = new JLabel("To Date");
buttonOK = new JButton("OK");
buttonCancel = new JButton("Cancel");
fromdate = new String();
todate = new String();
fromtxt = new JTextField(10);
totxt = new JTextField(10);
fromdate = fromtxt.getText();
todate = totxt.getText();
mainPanel.add(fromlabel);
fromlabel.setBounds(20,20,50,15);
mainPanel.add(tolabel);
tolabel.setBounds(20,50,50,15);
mainPanel.add(fromtxt);
fromtxt.setBounds(90,20,130,20);
mainPanel.add(totxt);
totxt. setBounds(90,50,130,20);
mainPanel.add(buttonOK);
buttonOK.setBounds(70,80,71,23);
mainPanel.add(buttonCancel);
buttonCancel.setBounds(150,80,71,23);
buttonOK.addActionListener(this);
buttonCancel.addActionListener(this);
setContentPane(mainPanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(247,140);
setResizable(false);
//pack();
public static void main(String args[]) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
catch(Exception e) {
System.err.println("Could not load Look and Feel" + e);
EDTDateValidation edtDateVal = new EDTDateValidation();
edtDateVal.setVisible(true);
public void actionPerformed(ActionEvent e) {
if(e.getSource() == buttonOK){
System.out.println(fromtxt.getText());
System.out.println(fromdate); //THIS PRINTS BLANK
System.out.println(todate); //THIS ASWELL
try {
Date date = null;
date = dtformat.parse(fromdate);
System.out.println("valid From date entered!");
catch(Exception f) {
System.out.println("Invalid From date entered!");
// textField1.setText("");
return;
try {
Date date = null;
date = dtformat.parse(todate);
System.out.println("valid TO date entered!");
catch(Exception f) {
System.out.println("Invalid To date entered!");
// textField1.setText("");
return;
}