How to make Dialog Box in java

   public void Diloagbox( Object my)
    {

      int re=JOptionPane.showInternalConfirmDialog(my,"Are You Want to Close","Choose yes or no",JOptionPane.YES_NO_OPTION);
     if(re==JOptionPane.YES_OPTION)
    {
         my.dispose();     }
    }
    public void DiloagboxError(String my)
    {
    javax.swing.JPanel jp=new javax.swing.JPanel();
        JOptionPane.showMessageDialog((Component)null,my,"Please Fill Correct Information",JOptionPane.ERROR_MESSAGE);
      
    }

public void MessageBox(String my)

{

  JOptionPane.showMessageDialog(this,my);
             

}