e837. 设置JTabbedPane中卡片的颜色

 // Create a tabbed pane
    JTabbedPane pane = new JTabbedPane();

    // Set the text color for all tabs
    pane.setForeground(Color.YELLOW);

    // Set the background color for all tabs
    pane.setBackground(Color.MAGENTA);

    // Add a tab
    String label = "Tab Label";
    pane.addTab(label, component);

    // Get index of the new tab
    int index = pane.getTabCount()-1;

    // Set text color for the new tab
    pane.setForegroundAt(index, Color.ORANGE);

    // Set background color for the new tab
    pane.setBackgroundAt(index, Color.GREEN);

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