e838. 使JTabbedPane中的卡片能用按键的方式选取

Setting a mnemonic on a tab allows the tab to be selected with a keystroke. For example, if the mnemonic for a tab were the key L, then typing ALT-L (on Windows) would select the tab.

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

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

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

    // Set the mnemonic; on some look and feels, the L in the label will be underlined
    int keycode = KeyEvent.VK_L;
    pane.setMnemonicAt(index, keycode);

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