Can anyone teach me how to create a JTable

Question

In my project, i would like to make a class extends JTable for which it can function like the excel one.
This means that the table can split into two parts.
Each of them have a standalone view and can let user to update the table.

Answer 1

Had some time to spare so a quick rough example.
Note this makes use of the TableModel created by JTable when passed an Object[][].
I'd recommend instead that you create your own TableModel and pass that to both JTables yourself.
import javax.swing.*;
import javax.swing.table.*;
public class SplitTableDemo extends JFrame
   public SplitTableDemo(String title) {
        super(title);
        // prepare data
        int cols = 26;
        int rows = 200;
        Object[][] data = new Object[rows][cols];
        for (int j=0; j<rows; j++) {
            for (int k=0; k<cols; k++) {
                data[j][k] = new String("");
        // prepare column names
        Object[] columnNames = new Object[cols];
        for (int m=0; m<cols; m++) {
            char c = (char) (65+m);   
            columnNames[m] = String.valueOf(c);
        // create first table view
        JTable upperTable = new JTable(data, columnNames);
        // create second table view with same model (obtained from first)
        TableModel tm = upperTable.getModel();
        JTable lowerTable = new JTable(tm);
        // put tables in ScrollPanes
        JScrollPane upperScroller = new JScrollPane(upperTable);
        JScrollPane lowerScroller = new JScrollPane(lowerTable);
        // display in split pane
        JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, upperScroller, lowerScroller);
        this.getContentPane().add(sp);
   public static void main (String[] args)
      SplitTableDemo splitTableDemo = new SplitTableDemo("Split Table Demo");
      splitTableDemo.pack();
      splitTableDemo.show();
}