e739. 创建一个标签组件

    // The text is left-justified and vertically centered
    JLabel label = new JLabel("Text Label");

    // The text is horizontally and vertically centered
    label = new JLabel("Text Label", JLabel.CENTER);

    // The text is right-justified and vertically centered
    label = new JLabel("Text Label", JLabel.RIGHT);

    // The text is left-justified and top-aligned
    label = new JLabel("Text Label", JLabel.LEFT);
    label.setVerticalAlignment(JLabel.TOP);

    // The text is right-justified and top-aligned
    label = new JLabel("Text Label", JLabel.RIGHT);
    label.setVerticalAlignment(JLabel.TOP);

    // The text is left-justified and bottom-aligned
    label = new JLabel("Text Label", JLabel.LEFT);
    label.setVerticalAlignment(JLabel.BOTTOM);

    // The text is right-justified and bottom-aligned
    label = new JLabel("Text Label", JLabel.RIGHT);
    label.setVerticalAlignment(JLabel.BOTTOM);

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