JAVA Swing:相对定位和自动调整大小?

我有一个createUI()函数,它将jpanel加载到北、南、东。

private void createUI() {
    add(createToolBar(), BorderLayout.NORTH);
    add(createDataView(), BorderLayout.SOUTH);
    add(createHistoryView(), BorderLayout.EAST);

    createMenuBar();

    setTitle("My Application");

}

但是,每个组件都显示在正确的位置,它们都是固定大小的jpanel。我想知道jpanel是否可以完全填充borderlayout区域。

例如,createDataView()是一个简单的包含表的jpanel。我希望它水平扩展,并有一个固定的高度。

private JPanel createDataView(){
        JPanel panel = new JPanel();

        String data[][] = {{"001","vinod","Bihar","India","Biology","65","First"},
                           {"002","Raju","ABC","Kanada","Geography","58","second"},
                           {"003","Aman","Delhi","India","computer","98","Dictontion"},
                           {"004","Ranjan","Bangloor","India","chemestry","90","Dictontion"},
                           {"004","Ranjan","Bangloor","India","chemestry","90","Dictontion"}};
        String col[] = {"Roll","Name","State","country","Math","Marks","Grade"};
        JTable table = new JTable(data,col);
        table.setPreferredScrollableViewportSize(new Dimension(900,100));
        JTableHeader header = table.getTableHeader();
        header.setBackground(Color.yellow);
        JScrollPane pane = new JScrollPane(table);
        table.setAutoResizeMode(JTable.WIDTH);
        table.doLayout();
        panel.add(pane);
        return panel;
}                      

现在我依靠手动设置尺寸。但是,我会找到一种方法来获取当前窗口宽度,并将其设置为如下所示。

table.setPreferredScrollableViewportSize(new Dimension(900,100));