hjælp med javax.swing!

Kode 

import javax.swing.*;

public class Main
{
  public static void main(String[] arg)
  {
      String eMAIL;
      eMAIL = javax.swing.JOptionPane.showInputDialog("intast din e-mail"); // promter for brugers e-mail
      
      if (eMAIL.contains("@"))
      {
          javax.swing.JOptionPane.showMessageDialog("TAK");
      }
//      else javax.swing.JOptionPane.showMessageDialog("DET ER IKKE EN E-mail!!!");
      
      
  }
}

Kode 

symbol  : method showMessageDialog(java.lang.String)
location: class javax.swing.JOptionPane
          javax.swing.JOptionPane.showMessageDialog("TAK");
1 error
BUILD FAILED (total time: 0 seconds)