Event-handling Problem in 3-JComboBox and 1-JTable Search Program

[SungChan Park]

My swing design is composed with 3-JComboBox & JTable.
I want search specific Table record which correspond to JComboBox
value. After compile Selection.java file, I got a above program
which does not respond to JComboBox.
Following is complete code.

 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Selection extends JFrame {

  int to;
  int to1;
  int to2;
  int to3;
  
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JPanel jPanel1 = new JPanel();
  String[] start = { "Y-Delta 기동", "직입기동"};
  String[] voltage = { "200V~240V 3상 60 Hz", "380V~440V 3상 60 Hz","500V~550V 3상 60 Hz"};
  String[] mt = { "110kW, 150HP", "132kW, 180HP"};
  
  JComboBox jComboBox1 = new JComboBox(start);
  JComboBox jComboBox2 = new JComboBox(voltage);
  JComboBox jComboBox3 = new JComboBox(mt);
  JScrollPane jScrollPane1 = new JScrollPane();
  
  JTable jTable1;
 
  String[][] data = {
            {"440", "GMC-3000", "300", "GTH-600", "400-600", "GMC-150", "GMC-300", "ABS803a", "800", "200"},
            {"220", "GMC-150", "150", "GTH-220", "160-240", "GMC-100", "GMC-150", "ABS403a", "400", "100"},
            {"165", "GMC-150", "140", "GTH-220", "120-180", "GMC-85", "GMC-150", "ABS403a", "300", "100"},
            {"528", "GMC-400", "400", "GTH-600", "400-600", "GMC-220", "GMC-400", "ABS1003a", "1000", "325"},
            {"264", "GMC-180", "180", "GTH-400", "200-300", "GMC-100", "GMC-180", "ABS603a", "500", "150"},
            {"198", "GMC-150", "140", "GTH-220", "160-240", "GMC-100", "GMC-150", "ABS403a", "350", "100"},
            {"440", "GMC-600", "600", "GTH-600", "400-600", "", "", "ABS803a", "800", "250"},
            {"200", "GMC-220", "220", "GTH-220", "160-240", "", "", "ABS403a", "400", "150"},
            {"176", "GMC-180", "180", "GTH-220", "160-240", "", "", "ABS403a", "350", "150"},
            {"528", "GMS-600", "600", "GTH-600", "400-600", "", "", "ABS1003", "1000", "325"},
            {"264", "GMS-300", "300", "GTH-400", "200-300", "", "", "ABS603a", "500", "200"},
            {"211", "GMS-300", "250", "GTH-400", "200-300", "", "", "ABS403a", "400", "200"},
        };
  
  
    String[] data1d = data[to];
    String[][] data_n = {data1d};
        String[] columnNames = {"모터부하", 
                                "전자접촉기",
                                "정격사용전류",
                                "과부하계전기",
                                "TOR설정",
                                "시동용접촉기", 
                                "운전용접촉기",
                                "배선용차단기",
                                "정격전류",
                                "전선단면적"};

        
  JLabel jLabel1 = new JLabel();
  JLabel jLabel2 = new JLabel();
  JLabel jLabel3 = new JLabel();

/**Construct the frame*/
public Selection() {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(800, 100));
this.setTitle("기종선정 프로그램");
jLabel1.setText("기동 조건");
jLabel2.setText("정격전압");
jLabel3.setText("모터출력");
jPanel1.add(jLabel1, null);
jPanel1.add(jComboBox1, null);
jPanel1.add(jLabel2, null);
jPanel1.add(jComboBox2, null);
jPanel1.add(jLabel3, null);
jPanel1.add(jComboBox3, null);
jPanel1.add(jScrollPane1, null);

contentPane.add(jPanel1, BorderLayout.NORTH);
jComboBox1.setSelectedIndex(0);
jComboBox2.setSelectedIndex(0);
jComboBox3.setSelectedIndex(0);

jComboBox1.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e1) {
        JComboBox cb1 = (JComboBox)e1.getSource();
        to1 = (int)cb1.getSelectedIndex();
    }
});
jComboBox2.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e2) {
        JComboBox cb2 = (JComboBox)e2.getSource();
        to2 = (int)cb2.getSelectedIndex();
    }
});
jComboBox3.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e3) {
        JComboBox cb3 = (JComboBox)e3.getSource();
        to3 = (int)cb3.getSelectedIndex();
    }
});
// Calculate int to to read data[to]
to = (to1*6) + 3*to2 + (to3 *1);

//put data_n into jTable1
jTable1 = new JTable(data_n, columnNames);
jScrollPane1.getViewport().add(jTable1, null);
jTable1.setPreferredScrollableViewportSize(new Dimension(790, 60));

}//Constructor

 /**Main method*/
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        Selection frame = new Selection();
        frame.setVisible(true);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    }

} 

It seems that the location of some code snippet was wrong.
Can anyone help me in this problem ?
Thanks in advance.

[SungChan Park]

Most uncertainty part of my code is the location and implementation of code

 // Calculate int to to read data[to]
to = to1*6 + 3*to2 + to3 *1; 

which try to read to'th row by multiplying to1, to2 and to3.
Is there a any Code-Guru who can solve it ?