public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); if (cmd.equals(F_TO_C)) { int f = fTextField.getValue(); int c = GMath.round((5.0 / 9.0) * (f - 32)); cTextField.setValue(c); } else if (cmd.equals(C_TO_F)) { int c = cTextField.getValue(); int f = GMath.round((9.0 / 5.0) * c + 32); fTextField.setValue(f); } }