2021-06-06label标签 icon 图标设置_label标签加图标-优快云博客

本文链接：https://blog.youkuaiyun.com/pangiggs/article/details/117635739

本文介绍了如何使用Java创建自定义TestIcon类实现JFrame的Icon接口，并与传统的ImageIcon进行比较，展示了如何在图形界面中显示图标。通过实例代码演示了如何设置图标尺寸、绘制和加载图片资源。

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//图标是接口，需要实现类
public class TestIcon extends JFrame implements Icon { //继承Frame并且实现了Icon接口
    private int width;
    private  int height;

    public TestIcon()  {
    }

    public TestIcon(int width, int height)  {
        this.width = width;
        this.height = height;
    }
    public void init(){
        TestIcon testIcon = new TestIcon(15, 15);
        //图片放在标签上，也可以放在按钮上
        JLabel label = new JLabel("icontest", testIcon, SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);
        setBounds(400,400,800,600);
        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 this.width;
    }

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

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

public class ImageIconDemo extends JFrame {
    public ImageIconDemo() {
        //获取图片地址、
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("002.jpg");
        ImageIcon imageIcon = new ImageIcon(url);
        label.setHorizontalAlignment(SwingConstants.CENTER);
        label.setIcon(imageIcon);
        Container container = getContentPane();
        container.add(label);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(400,400,800,600);
    }

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