说明：把图片显示在label上；常用api的作用；使用JFrame等时 关闭窗口--退出调试的代码。
完整代码，已编译执行成功
import javax.imageio.*;//for ImageIO.read
import java.awt.*;//for JFrame and JLabel etc
import javax.swing.*;//for JFrame and JLabel etc
import java.net.*;//for URL
import java.io.*;//for catch (IOException e),File,InputStream, BufferedInputStream,and FileInputStream ect
public class HelloJava{
public static void main (String[] args){
Image image = null;
try {
// Read from a file
File sourceimage = new File("source.gif"); //source.gif图片要与HelloJava.java同在一目录下
image = ImageIO.read(sourceimage);
// Read from an input stream
InputStream is = new BufferedInputStream(
new FileInputStream("mid.jpg")); //mid.jpg图片要与HelloJava.java同在一目录下
image = ImageIO.read(is);
// Read from a URL
URL url = new URL("http://www.javaworld.com/images/012407-tipsbox.jpg");
image = ImageIO.read(url);
} catch (IOException e) {
}
// Use a label to display the image
JFrame frame = new JFrame();
JLabel label = new JLabel(new ImageIcon(image));
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
//关闭窗口--退出调试
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
