Icon,Imagelcon(图标)

1.文字图标

package com.jia.lesson;import javax.swing.*;
import java.awt.*;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);//图标放在标签,也可以放在按钮上JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);Container container =this.getContentPane();container.add(label);this.setVisible(true);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}@Overridepublic void paintIcon(Component c, Graphics g, int x, int y) {g.fillOval(x, y, width, height);}@Overridepublic int getIconWidth() {return this.width;}@Overridepublic int getIconHeight() {return this.height;}public static void main(String[] args) {new IconDemo().init();}
}

2.图片图标

注意问题:

图片添加后显示空指针,此时重启idea就好了

package com.jia.lesson;import javax.swing.*;
import java.awt.*;
import java.net.URL;public class ImageIconDemo extends JFrame{//构造器public ImageIconDemo() {//获取图片的地址,图片和代码在同级目录JLabel label = new JLabel("ImageIcon");URL url=ImageIconDemo.class.getResource("dsBuffer.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);}//主程序public static void main(String[] args) {new ImageIconDemo();}}

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