hmm mitenköhän

opetella Swingiä

import javax.swing.JOptionPane;

public class Esimerkki {

   public static void main(String[] args) {
      int k1 = Integer.parseInt(
            JOptionPane.showInputDialog("Anna 1. kokonais luku"));

      int k2 = Integer.parseInt(
            JOptionPane.showInputDialog("Anna 2. kokonais luku"));

      String tulos =
         "Summa: " k1 " " k2 " = " (k1 k2) "\n"
         "Erotus: " k1 " - " k2 " = " (k1 - k2) "\n"
         "Tulo: " k1 " * " k2 " = " (k1 * k2) "\n"
         "Osamäärä: " k1 " / " k2 " = " (k1 / k2);
      
      JOptionPane.showMessageDialog(
         null,
         tulos,
         "Tulokset",
         JOptionPane.ERROR_MESSAGE);
   }
}