GUI编程

import java.awt.EventQueue;
import java.awt.Image;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.IOException;
public class Myjava extends JFrame {
private JPanel contentPane;
private int idImg = 1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Myjava frame = new Myjava();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Myjava() {
setTitle("\u56FE\u7247\u663E\u793A");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 576, 404);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
final JLabel lblNewLabel = new JLabel("New label");
lblNewLabel.setBackground(Color.YELLOW);
lblNewLabel.setForeground(Color.PINK);
lblNewLabel.setBounds(48, 86, 400, 400);
contentPane.add(lblNewLabel);
JButton btnNewButton = new JButton("\u663E\u793A\u4E0B\u4E00\u5F20\u56FE\u7247");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ImageIcon icon;
try {
// 获取图片的路径
String strImgFile = "D:/demoPhoto/";
// 得到图片的完整路径
strImgFile = strImgFile + String.valueOf(idImg) + ".jpg";
// 读取图片
icon = new ImageIcon(ImageIO.read(new File(strImgFile)));

// 从图表中获取到图片
Image image = icon.getImage();
// 缩放图像
Image smallImage = image.getScaledInstance(400,400,Image.SCALE_FAST);

//把Image文件转化为ImageIcon
icon = new ImageIcon(smallImage);
lblNewLabel.setIcon(icon);
// 为下一张图片做准备，一共9张图片，显示完第9张后，重新显示第一张
idImg = idImg+1;
if(idImg==10)
idImg = 1;
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
btnNewButton.setBounds(194, 37, 153, 28);
contentPane.add(btnNewButton);
}
}