GUI编程：swing之标签( Icon与ImageIcon)

野性酷女 2022-11-11 13:12 194阅读 0赞

## Icon标签 ##

**示例代码：**

//图片标签
    public class TestIcon {
        
        public static void main(String[] args) {
        
            new IconDemo(100,100).init();
        }
    }
    //图标，需要实现类，JFrame继承
    class IconDemo extends JFrame implements Icon {
        
        //属性
        private int width;
        private int high;
    
        public IconDemo() {
        //无参构造
        }
    
        public IconDemo(int width, int high) {
        //有参构造
            this.width = width;
            this.high = high;
        }
    
        //方法
        public void init() {
        
            setBounds(100, 100, 300, 300);
            IconDemo icon = new IconDemo(15, 15);
            //图标放在标签上，也可以放在按钮上
            JLabel jLabel = new JLabel("wuyang", icon, SwingConstants.CENTER);
            Container container = getContentPane();
            container.add(jLabel);
    
            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, high);
        }
    
        @Override
        public int getIconWidth() {
        
            return this.width;
        }
    
        @Override
        public int getIconHeight() {
        
            return this.high;
        }
    }

## ImageIcon标签 ##

**示例代码：**

//图片标签
    public class ImageIconDemo extends JFrame {
        
        public static void main(String[] args) {
        
            new ImageIconDemo();
        }
        public ImageIconDemo()  {
        
            //获取图片地址     url是一个具体的地址
            JLabel jLabel = new JLabel("ImageIcon");
            URL url = ImageIconDemo.class.getResource("guigui.jpg");//获取当前类下的资源
    
            //命名避免冲突
            ImageIcon imageIcon = new ImageIcon(url);
            jLabel.setIcon(imageIcon);//图片放在jLabel上
            jLabel.setHorizontalAlignment(SwingConstants.CENTER);
    
            Container container = getContentPane();
            container.add(jLabel);
    
            setVisible(true);
            setBounds(600,600,400,400);
            setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        }
    }