private void tableSiswaMouseClicked(java.awt.event.MouseEvent evt) {
  inputNis.setText(tableSiswa.getValueAt(tableSiswa.getSelectedRow(), 0).toString());
  inputNama.setText(tableSiswa.getValueAt(tableSiswa.getSelectedRow(), 1).toString());
  inputJurusan.setSelectedItem(tableSiswa.getValueAt(tableSiswa.getSelectedRow(), 2).toString());
  inputJK.setSelectedItem(tableSiswa.getValueAt(tableSiswa.getSelectedRow(), 3).toString());
  inputAlamat.setText(tableSiswa.getValueAt(tableSiswa.getSelectedRow(), 4).toString());
  buttonSimpan.setEnabled(false);
  buttonUpdate.setEnabled(true);
  buttonHapus.setEnabled(true);
}