import java.awt.FlowLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;

public class ComboBoxText {
    private static String[] data1 = {"北京","天津","上海"};
    private static String[] data2 = {"东北","华北","华南"};

    public static void main(String[] args) {
        final ComboBoxText ct = new ComboBoxText();
        final JTable t = new JTable(2,2);
        final JComboBox cb = new JComboBox();
        t.setValueAt("1", 0, 0);
        t.setValueAt("2", 0, 1);
        t.setValueAt("3", 1, 0);
        t.setValueAt("4", 1, 1);
        
        t.addMouseListener(new MouseListener() {
            public void mouseClicked(MouseEvent e) {
            }

            public void mousePressed(MouseEvent e) {
                int rowIndex = t.getSelectedRow();
                int colIndex = t.getSelectedColumn();
                if(rowIndex==0){
                    cb.removeAllItems();
                    for (int i = 0; i < data1.length; i++) {
                        cb.addItem(data1[i]);
                    }
                }
                
                if(rowIndex==1){
                    cb.removeAllItems();
                    for (int i = 0; i < data2.length; i++) {
                        cb.addItem(data2[i]);
                    }
                }
                
            }
            public void mouseReleased(MouseEvent e) {
            }

            public void mouseEntered(MouseEvent e) {
            }

            public void mouseExited(MouseEvent e) {
            }
        });
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT));
        f.add(t);
        f.add(cb);
        f.setVisible(true);
        f.setSize(200, 100);
    }
}

------解决方案--------------------
Java code


import java.awt.FlowLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;

public class ComboBoxText {

    public static void main(String[] args) {
        final int numRows = 4;
        final int numColumns = 2;
        final ComboBoxText ct = new ComboBoxText();
        final JTable t = new JTable(numRows,numColumns);
        final JComboBox cb = new JComboBox();
        t.setValueAt("北京", 0, 0);
        t.setValueAt("天津", 1, 0);
        t.setValueAt("上海", 2, 0);
        t.setValueAt("重庆", 3, 0);
        
        t.setValueAt("1", 0, 1);
        t.setValueAt("2", 1, 1);
        t.setValueAt("3", 2, 1);
        t.setValueAt("4", 3, 1);
        
        t.addMouseListener(new MouseListener() {
            public void mouseClicked(MouseEvent e) {
            }

            public void mousePressed(MouseEvent e) {
//              int rowIndex = t.getSelectedRow();
                int colIndex = t.getSelectedColumn();
                cb.removeAllItems();
                for (int i = 0; i < numRows; i++) {
                    Object o = t.getValueAt(i, colIndex);
                    cb.addItem(o);
                }
            }
            public void mouseReleased(MouseEvent e) {
            }

            public void mouseEntered(MouseEvent e) {
            }

            public void mouseExited(MouseEvent e) {
            }
        });
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT));
        f.add(t);
        f.add(cb);
        f.setVisible(true);
        f.setSize(400, 400);
    }
}