Moving JLabel in a JFrame

Question

Hi .
I want to move a JLabel in a JFrame and i set bounds for JLalbe using while
such as :
JLabel lb=new JLabel("JLABEL");
int x=50,;
int y=0;
int w=60;
int h=40;
lb.setBounds(x,y,w,h) ;
while(y<100)
lb.setBounds(x,y,z,t);
y+=1;
But when lb moves in JFrame , it has vertical line its color is Color of lb ?
what should i do to solve this problem ?

Answer 1

Do you have an override of your paintComponent and do you call super.paintComponent from it?
It probably has to do with the fact that you are trying to pig all the CPU cycles and not allowing other processing in your thread, try this:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;
public class Junk extends JFrame implements ActionListener{
  private int dX = 1;
  private int dY = 1;
  public int x = 1;
  public int y = 1;
  public JLabel l = null;
  public Timer t = null;
  Junk(){
    t = new Timer(10, this);
  public static void main(String[] args){
    Junk f = new Junk();
    f.setTitle("Junk X.x");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setLayout(null);
    f.setSize(600, 600);
    f.l = new JLabel("This is a JLabel");
    f.l.setSize(100, 30);
    f.add(f.l);
//    f.pack();
    f.setVisible(true);
    f.t.start();
  public void actionPerformed(ActionEvent e){
    if((x+l.getWidth()) >= this.getWidth() || x == 0) dX *= (-1);
    if((y+l.getHeight()) >= this.getHeight() || y == 0) dY *= (-1);
     x += dX;
     y += dY;
     l.setLocation(x, y);
}The timer gives the GUI time to update.
BTW: yes, I know I should have used a JPanel. Mmmm... brain dead late night coding....