Java之GUI Icon ImageIcon

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public class IconDemo extends JFrame implements Icon {

    private int width;
    private int height;

    public IconDemo() {
    }

    public IconDemo(int width, int height) {
        this.width = width;
        this.height = height;
    }

    public void init() {
        IconDemo iconDemo = new IconDemo(15, 15);
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);

        Container container = getContentPane();
        container.add(label);

        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.fillOval(x, y, width, height);
    }

    @Override
    public int getIconWidth() {
        return width;
    }

    @Override
    public int getIconHeight() {
        return height;
    }

    public static void main(String[] args) {
        new IconDemo().init();
    }
}

public class ImageIconDemo extends JFrame {
    public ImageIconDemo() {
        //獲取圖片地址
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("tx.jpg");

        ImageIcon imageIcon = new ImageIcon(url);
        label.setIcon(imageIcon);
        label.setHorizontalAlignment(SwingConstants.CENTER);

        Container container = getContentPane();
        container.add(label);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new ImageIconDemo();
    }
}