private JPanel panel;
    static String[] cloum = {"商品号","商品名","产地","货架上存在数量","单件价格","生产日期"};
    static Object[][] row =new Object[15][6];

	private static JTable table =new JTable(row,cloum);
        private  JScrollPane scrollPane =new JScrollPane(table);JPanel panel = new JPanel();
	public void init() {
		panel.setBounds(37, 10, 491, 413);
		contentPane.add(panel);
		//panel.setLayout(null);    //贼关键！！！
		table.setBounds(37,10, 491, 413);
		panel.add(scrollPane,BorderLayout.CENTER);
}
   **在创建Jtable的时候不能用 panel.add(table);这样直接添加，应该把jtable封装进JScrollPane z中。panel再添加JScrollPane。结果还是不行。
   尝试了几次，把setlayout注释掉就可以了。**