Problem is getting java to create table and peform operation to stop

import javax.swing.*;
public class CelsuistoFaraheit{
public static void main(String [] args){

int celsius;
for( celsius = 1; celsius <= 20; celsius++){

int farenheit = ((9/5 * celsius) + 32);
JOptionPane.showMessageDialog(null, + celsius + "\t\t" + farenheit);
}





}
}