import sun.jvm.hotspot.oops.ObjectHistogram; //导入依赖的package包/类
public ObjectHistogramPanel(ObjectHistogram histo) {
    dataModel = new ObjectHistogramTableModel(histo);
    statusBar = new StatusBar();

    table = new JTable(dataModel, new ObjectHistogramColummModel());
    table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    table.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent evt) {
                if (evt.getClickCount() == 2) {
                    fireShowObjectsOfType();
                }
            }
        });

    JTableHeader header = table.getTableHeader();
    header.setDefaultRenderer(new SortHeaderCellRenderer(header, dataModel));
    header.addMouseListener(new SortHeaderMouseAdapter(table, dataModel));

    setLayout(new BorderLayout());

    toolbar = new ObjectHistogramToolBar(statusBar);
    add(toolbar, BorderLayout.NORTH);
    add(new JScrollPane(table), BorderLayout.CENTER);
    add(statusBar, BorderLayout.SOUTH);

    registerActions();
}
 

import sun.jvm.hotspot.oops.ObjectHistogram; //导入依赖的package包/类
public ObjectHistogramTableModel(ObjectHistogram histo) {
    // Set the rows
    elements = histo.getElements();
    setComparator(new ObjectHistogramComparator(this));

}