关于显示Image加载的图片显示问题?

Question

如果你用的是J组件，请重载protected  void paintComponent(Graphics g)  而不是protected  void paint(Graphics g)。原因是因为所有的J组件都是paint出来的。

Answer 1

我重载了paintComponent，效果还是一样，要在显示窗口后再次让其强制重画才行

Answer 2

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;class ImgPanel extends JPanel
{

public void paintComponent(Graphics g)
{
super.paintComponent(g);
ImageIcon img = new ImageIcon("images\\big.jpg");
img.paintIcon(this,g,0,0);

}
}public class ImageTest extends JFrame
{
public ImageTest()
{
Container contentPane = getContentPane();
contentPane.add(new ImgPanel());

setTitle("Image Test");
setSize(800,600);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}

public static void main(String[] args)
{
JFrame frame = new ImageTest();
frame.setVisible(true);
}
}

Answer 3

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;class ImgPanel extends JPanel
{

public void paintComponent(Graphics g)
{
super.paintComponent(g);
Image img = getToolkit().getImage("images\\big.jpg");
g.drawImage(img,0,0,this);//这句应该这样写

}
}public class ImageTest extends JFrame
{
public ImageTest()
{
Container contentPane = getContentPane();
contentPane.add(new ImgPanel());

setTitle("Image Test");
setSize(800,600);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}

public static void main(String[] args)
{
JFrame frame = new ImageTest();
frame.setVisible(true);
}
}