Java Graphics - 如何绘制BufferedImage并改变其大小

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {

  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

      @Override
      public void run() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new ImagePanel("yourImage.JPG"));
        frame.pack();
        frame.setVisible(true);
      }
    });
  }
}

class ImagePanel extends JPanel {

  BufferedImage img;

  ImagePanel(String name) {
    super(true);
    try {
      img = ImageIO.read(new File(name));
      this.setPreferredSize(new Dimension(img.getWidth(), img.getHeight()));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  @Override
  protected void paintComponent(Graphics g) {
    g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), null);
  }
}