ImageIO.read()显示图片按大小与窗口大小不对应

学习Java中 awt和ImageIO时，遇到了如下问题 ：
在用ImageIO.read()方法读取图片并通过BufferedImage展示在Frame上时，显示图片大小和我设置的Frame窗口大小不一致，导致不能正确显示图片 ，如图 ：

代码如下 ：

javax.imageio.ImageIO;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class ImageIOPractice {

    Frame frame = new Frame("位图读写");
    MenuBar menuBar  = new MenuBar();
    Menu menu  = new Menu("文件");
    MenuItem open = new MenuItem("打开");
    MenuItem save = new MenuItem("另存为");

    //声明BufferedImage对象记录读取的图片
    BufferedImage image ;

    private class  myCanvas extends Canvas{
        @Override
        public void paint(Graphics g) {
            g.drawImage(image,0,0,null);

        }
    }
    myCanvas drawArea = new myCanvas();

    public void init(){
        open.addActionListener(e->{
            //lamada表达式
            //打开文件对话框
            FileDialog fileDialog = new FileDialog(frame,"打开图片",FileDialog.LOAD);
            fileDialog.setVisible(true);
            //获取图片路径及名称
            String fileName = fileDialog.getFile();
            String directory = fileDialog.getDirectory();
            try {
                image = ImageIO.read(new File(directory,fileName));
                drawArea.repaint();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        });

        save.addActionListener(e -> {
            FileDialog fileDialog = new FileDialog(frame,"保存图片",FileDialog.SAVE);
            fileDialog.setVisible(true);
            String directory = fileDialog.getDirectory();
            String fileName = fileDialog.getFile();
            try {
                ImageIO.write(image,"jpg",new File(directory,fileName));
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        });

        menu.add(open);
        menu.add(save);
        menuBar.add(menu);
        frame.setMenuBar(menuBar);
        frame.add(drawArea);

        frame.setBounds(200,200,700,500);
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        frame.setVisible(true);
    }

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

求解决方法