I want to show labels having images one by one in Panel

Question

i want to show labels having images one by one in Panel through a while loop...
I made an ImagIcon array.
It doesn't work properly.
It shows only first image while the variable is incrementing. :(
This is my code...(Plz check it....)
import java.awt.*;
import javax.swing.*;
public class test extends JFrame
ImageIcon imgIco = new ImageIcon("mylogo.jpg");
ImageIcon imgIco1 = new ImageIcon("mylogo1.jpg");
ImageIcon imgIco2 = new ImageIcon("mylogo2.jpg");
ImageIcon imgIco3 = new ImageIcon("mylogo3.gif");
ImageIcon imgIco4 = new ImageIcon("mylogo4.gif");
ImageIcon[] a = {imgIco,imgIco1,imgIco2,imgIco3,imgIco4};
JButton b1 = new JButton("Add");          
JLabel l1;
JPanel p1 = new JPanel();
public test(String title)
super(title);
int s = 0;
while(s<=4)          
     try
          Thread.sleep(100);
          System.out.println(s);
          l1 = new JLabel(a[s]);
          repaint();
     /*if(s==1)
          p1.remove(l1);     
     catch(Exception e)
     System.out.println("Error Occured!!!");
     p1.add(l1);     
System.out.println(s);
s++;                              
     setContentPane(p1);          
public static void main(String args[])     
     test t = new test("Title");
     t.setSize(900,470);
t.setVisible(true);
t.setResizable(false);

Answer 1

You are sleeping the thread used to perform the repaint.
Calling repaint only marks a component as needing painting, and AWT will paint it later. If you continue to loop in the mainthread then you will not see the changes.
You have to move your loop to another thread.