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sushant
Validate JTexField with date on Text Changed event
1 Answer(s)      4 years and 3 months ago
Posted in : Java Beginners


Hello Sir I want to only Validate date in MM/DD/YYYY Format on TextChanged Event,date will automatically set through MM with two digits,then cursor will automatically set to next DD of Two digits and same as year of four digits within one JTextField and also have onTextChanged Validation ,plz Help me sir

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April 10, 2010 at 11:53 AM


Hi Friend,

Try the following code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.text.*;
class Validations extends JFrame{
JLabel l1,l2,l3,l;
JLabel lab1,lab2,lab3;
JTextField t1,t2,t3;
JPanel p;

Validations(){
l1=new JLabel("Enter Date: (MM/dd/yyyy)");
t1=new JTextField(20);

lab1=new JLabel();

p=new JPanel(new GridLayout(2,2));
p.add(l1);
p.add(t1);
p.add(lab1);
add(p);
setVisible(true);
pack();
lab1.setVisible(false);
t1.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
String date=t1.getText();
if(isValidDate(date)){
lab1.setVisible(false);
}
else{
lab1.setText("* Invalid date");
lab1.setForeground(Color.red);
lab1.setVisible(true);
}
}
});

}
public boolean isValidDate(String inDate) {

if (inDate == null)
return false;
SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
dateFormat.setLenient(false);
try {
dateFormat.parse(inDate.trim());
}
catch (ParseException pe) {
return false;
}
return true;
}
public static void main(String[]args){
Validations v=new Validations();
}
}

Thanks


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