javax.swing.JTable标题问题，始终不显示，不知道什么原因。。

import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TableRightTest extends JFrame{
// private JPanel jp;
public TableRightTest(){
this.setSize(800, 500);
this.setLocation(250, 150);
this.setLayout(null);
this.setResizable(false);
this.setVisible(true);
this.initTable();
}

private JTable tbl_query;
private DefaultTableModel defaultTblModel;
private int tableColumn=9;
private void initTable() {
    String[] columnNames= new String[tableColumn];
    Object[][] data={};
    DefaultTableModel dmodel = new DefaultTableModel(data,columnNames);
    defaultTblModel = dmodel;
    tbl_query = new JTable(dmodel);
    tbl_query.setPreferredScrollableViewportSize(new Dimension(30, 30));
    tbl_query.setBounds(1, 1, 699, 160);
    JScrollPane jsp = new JScrollPane();
    jsp.setLayout(null);
    jsp.setBounds(50, 150, 700, 200);
    jsp.setVisible(true);
    jsp.setBackground(new Color(120,145,152));
    jsp.add(tbl_query);
    this.add(jsp);
    initTableData();
}
private void initTableData() {
    // TODO Auto-generated method stub
    for(int j=0;j<3;j++){
        String[] arr = new String[tableColumn];
        for(int i=0;i<tableColumn;i++){
            arr[i]= "A"+i;
        }
        defaultTblModel.addRow(arr);
    }

}
public static void main(String[] args) {
    new TableRightTest();
}

}

如果是表头参照一下：[url]http://liuqing-2010-07.iteye.com/blog/994858[/url]
如果是其他标题需要用JLable的哟！

[code="java"]public TableRightTest() {
this.setSize(800, 500);
this.setLocation(250, 150);
this.setLayout(null);
this.setResizable(false);
this.setVisible(true);
this.initTable();
this.setTitle("hello");//设置标题？
}[/code]

你说的是Jtable的表头吧 而不是标题？