如何在运行时更改JTabbedpane组件的属性？

Question

I am creating a tabbedpane

tabs= new JTabbedPane();
tabs.addChangeListener(new ChangeListener() {
    @Override
    public void stateChanged(ChangeEvent e) {
          JTabbedPane sourceTabbedPane = (JTabbedPane) e.getSource();
          int index = sourceTabbedPane.getSelectedIndex();
          sourceTabbedPane.getTabComponentAt(index).getComponentAt(0).setForeground(Color.RED);

});

tabs.setTabComponentAt(0, new JLabel("tab1"));
tabs.setTabComponentAt(0, new JLabel("tab2"));

I get this error:

The method getComponentAt(Point) in the type Component is not applicable for the arguments (int)

How do I get hold of the LABEL I put on the selectedTab? I want to set the foreground on the label.

EDIT 1

I also get a null pointer error at runtime.

Answer 1

Component.getComponentAt accepts a Point object or two integers as int x, int y , that it looks for child components at that location.

http://docs.oracle.com/javase/6/docs/api/java/awt/Component.html