a little problem

ei guys i got a little problem about the textfield?? i dont know if that need a loop ...
i want that if the user not fill all the blanks he cannot pass ...

heres my code ..

Code:

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Information extends JFrame implements ActionListener{
       
     
        JLabel lbl = new JLabel("Employee No.:");
                JTextField txt = new JTextField();
               
                JLabel lbl2 = new JLabel("Last Name :    ");
                JTextField txt2 = new JTextField();
               
        JLabel lbl3 = new JLabel("First Name :    ");
                JTextField txt3 = new JTextField();
               
                JLabel lbl4 = new JLabel("Middle Name :  ");
                JTextField txt4 = new JTextField();
               
                JLabel lbl5 = new JLabel("Department :  ");
                JTextField txt5 = new JTextField();
               
                JLabel lbl6 = new JLabel("Position :          ");
                JTextField txt6 = new JTextField();
       
                JButton btn = new JButton("SAVE");
                JButton btn2 = new JButton("CLOSE");
               
               
       
public Information(){
                super("Enployee's Information");
                Container c = getContentPane();
                c.setLayout(null);
                c.setBackground(Color.BLACK);
               
                //Posistions
                lbl.setBounds(10,100,100,20);
                txt.setBounds(100,100,200,20);
               
                lbl2.setBounds(10,140,100,20);
                txt2.setBounds(100,140,200,20);
               
                lbl3.setBounds(10,180,100,20);
                txt3.setBounds(100,180,200,20);
               
                lbl4.setBounds(10,220,100,20);
                txt4.setBounds(100,220,200,20);
               
                lbl5.setBounds(10,260,100,20);
                txt5.setBounds(100,260,200,20);
               
                lbl6.setBounds(10,300,100,20);
                txt6.setBounds(100,300,200,20);
               
               
                //buttons
                btn.setBounds(100,350,80,30);
                btn2.setBounds(200,350,80,30);
                btn.addActionListener(this);
                btn2.addActionListener(this);
               
               
                //label colors
                lbl.setForeground(Color.WHITE);
                lbl2.setForeground(Color.WHITE);
                lbl3.setForeground(Color.WHITE);
                lbl4.setForeground(Color.WHITE);
                lbl5.setForeground(Color.WHITE);
                lbl6.setForeground(Color.WHITE);
               
                //layout
                c.add(lbl);        c.add(txt);        c.add(lbl2); c.add(txt2);
                c.add(lbl3); c.add(txt3); c.add(lbl4); c.add(txt4);
                c.add(lbl5); c.add(txt5); c.add(lbl6); c.add(txt6);
                c.add(btn); c.add(btn2);
               
               
                setSize(350,450);
                setResizable(false);
                setDefaultCloseOperation(EXIT_ON_CLOSE);
                show();
 
    }
    public void actionPerformed(ActionEvent e){
            int num = 0;
            String emp = " ";
            String Fname = " ";
            String Lname = " ";
            String Mname = " ";
            String Dep  = " ";
            String Pos  = " ";
           
           
            emp = txt.getText();
            Fname = txt2.getText();
            Lname = txt3.getText();
            Mname = txt4.getText();
                  Dep = txt5.getText();
            Pos = txt6.getText();
   
           
           
           
    if(e.getSource() == btn){
            if(emp.equals(" ") && Fname.equals(" ")&& Lname.equals(" ") && Mname.equals(" ") && Dep.equals(" ")&& Pos.equals(" ") )
            {
                            JOptionPane.showMessageDialog(null,"Sorry, fill all the blank");
                   
            }
        else {
                 
                    JOptionPane.showMessageDialog(null,"Succes");
           
           
    }
   
                   
   
   
    }
   
   
   
    public static void main(String [] args){
                Information information = new Information();
                information.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
}

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When you run this program, do you get the pop-up when you miss a field?

no ... when i click the save button it say "Success" but all the txt field was blank..

Ah, okay, try this.

Code:

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    if(e.getSource() == btn){
        if(emp.equals("") || Fname.equals("") || Lname.equals("") || Mname.equals("") || Dep.equals("") || Pos.equals("") )  {
                JOptionPane.showMessageDialog(null,"Sorry, fill all the blank");
        } else {
                    JOptionPane.showMessageDialog(null,"Succes");   
    }

---

The way you were running it as "&&" was meaning it will ONLY run the error message if every single JTextField had " " within it.

i tried this one ..

Code:

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if(e.getSource() == btn){
            while(emp.equals(" ") || Fname.equals(" ")|| Lname.equals(" ") || Mname.equals(" ") || Dep.equals(" ")|| Pos.equals(" ") )
            {
                            JOptionPane.showMessageDialog(null,"Sorry, fill all the blank");
                            break;
            }
           
                JOptionPane.showMessageDialog(null,"Succes");

---

But i fill all the blanks then it say : sorry,fill all the blank then Succes..

No, don't use a while loop of that nature in a Swing application. Use your if/else block just as you were doing before. Also, this:

if (Lname.equals(" "))

is unreliable and unstable. For one, you don't initialize your JTextFields with the " " String, so this will likely always equate to false. And even if you did that, if the user deletes the space and you're left with a "" String, is it now considered a "good" input? Perhaps you want to instead do

if (Lname.trim().isEmpty())

or something similar.

Also, you should follow Java naming conventions in that all variable names should start with a lower-case letter and should use "camel" case. All class names should start with a capital letter as well.