标签

package com.hai.week2;

import javax.swing.*;
import java.awt.*;

public class Demo10 extends JFrame implements Icon {
    int width;
    int height;

    public Demo10()  {
    }

    public Demo10(int width, int height)  {
        this.width = width;
        this.height = height;
    }

    public void init(){
        Demo10 icon = new Demo10(15, 15);
        JLabel jLabel = new JLabel("??", icon, SwingConstants.CENTER);
        Container container = this.getContentPane();
        container.add(jLabel);
        setVisible(true);
        setBounds(100,100,200,200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new Demo10().init();
    }

    @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;
    }
}

　　图片标签

package com.hai.week2;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class Demo11 extends JFrame {
    public Demo11() {
        JLabel jLabel = new JLabel("????");
        URL resource = Demo11.class.getResource("tx.jpg");
        ImageIcon imageIcon = new ImageIcon(resource);
        jLabel.setIcon(imageIcon);
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);
        Container container = this.getContentPane();
        container.add(jLabel);
        setBounds(100,100,500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new Demo11();
    }
}