Display Image Using Label in Swing

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class form1 extends JFrame
{
JLabel l1;
form1()
{
Icon icon2=new ImageIcon("4.JPG");
l2=new JLabel(icon2);
l2.setBounds(0,0,600,500);
cn.add(l2);
setBounds(250,100,600,100);
cn.setBackground(Color.BLACK);
setSize(600,500);
setVisible(true);
addWindowListener(this);

}
public static void main(String arg[])
{
new form1();
}
}

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