Java 在PIC之间切换(JFrame、JButton)
我正在尝试创建一个窗口,当按下“更改”按钮时,可以在图片之间切换。当我试图运行程序时,Java徽标会弹出,就像程序即将启动一样,但随后它就消失了。我现在有点不知所措,我希望有人能给我一个提示,告诉我可能出了什么问题Java 在PIC之间切换(JFrame、JButton),java,swing,jframe,jbutton,Java,Swing,Jframe,Jbutton,我正在尝试创建一个窗口,当按下“更改”按钮时,可以在图片之间切换。当我试图运行程序时,Java徽标会弹出,就像程序即将启动一样,但随后它就消失了。我现在有点不知所措,我希望有人能给我一个提示,告诉我可能出了什么问题 import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.net.URL; import javax.imageio.*; import javax.swing.*; p
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
import javax.imageio.*;
import javax.swing.*;
public class ImageViewer extends JFrame{
private JPanel panel;
private JLabel imageLabel;
private JButton button;
private Icon[] icons = {};
private static final long serialVersionUID = 1L;
public ImageViewer() {
try {
panel = new JPanel();
URL url1 = new URL("http://www.sm.luth.se/csee/courses/d0010e/l/prob/10tj5Ei9o/LTU-Teatern.jpg");
URL url2 = new URL("http://www.sm.luth.se/csee/courses/d0010e/l/prob/10tj5Ei9o/LTU-Vetenskapens-hus.jpg");
Icon image = new ImageIcon(ImageIO.read(url1));
Icon image2 = new ImageIcon(ImageIO.read(url2));
icons[0] = image;
icons[1] = image2;
imageLabel = new JLabel();
panel.add(button);
panel.add(imageLabel);
button = new JButton("Change");
button.addActionListener(new ActionListener() {
private boolean value = false;
{
}
public void actionPerformed(ActionEvent arg0) {
value = value == true ? false : true;
if (value == false) {
imageLabel.setIcon(icons[0]);
}else {
imageLabel.setIcon(icons[1]);
}
}
});
this.setContentPane(panel);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}catch (Exception e) {
}
}
public static void main(String args[]) {
new ImageViewer();
}
}
首先,这里是我创建的内容,为您提供一些提示 这是代码。提示将在代码之后出现
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class ImageViewer implements Runnable {
private boolean isImage1;
private BufferedImage image;
private ImageData imageData;
private JLabel label;
public static void main(String args[]) {
SwingUtilities.invokeLater(new ImageViewer());
}
public ImageViewer() {
this.imageData = new ImageData();
this.image = imageData.getImage1();
this.isImage1 = true;
}
@Override
public void run() {
JFrame frame = new JFrame("Image Viewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
label = new JLabel(new ImageIcon(image));
panel.add(label);
JButton button = new JButton("Change");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if (isImage1) {
image = imageData.getImage2();
} else {
image = imageData.getImage1();
}
label.setIcon(new ImageIcon(image));
isImage1 = !isImage1;
}
});
panel.add(button);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
public class ImageData {
private BufferedImage image1;
private BufferedImage image2;
public ImageData() {
URL url1;
URL url2;
try {
url1 = new URL("http://www.sm.luth.se/csee/courses/d0010e/l/prob/10tj5Ei9o/LTU-Teatern.jpg");
url2 = new URL("http://www.sm.luth.se/csee/courses/d0010e/l/prob/10tj5Ei9o/LTU-Vetenskapens-hus.jpg");
this.image1 = readImage(url1);
this.image2 = readImage(url2);
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
private BufferedImage readImage(URL url) {
try {
return ImageIO.read(url);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public BufferedImage getImage1() {
return image1;
}
public BufferedImage getImage2() {
return image2;
}
}
}
下面是一些提示
}捕获(异常e){}
不要忽略异常!他们准确地告诉我们出了什么问题。除非实现日志记录,否则至少调用Throwable.printStackTrace()
4)BTW-value=!价值观代码>比value=value==true更短更清晰?假:真代码>