Hello. I want to make a File->Open menu functionality to this program. In JMenuBar I think I create everything correctly but it doesn't display when I run it. How do I display it and make the Open functionality work?
package oimg;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.swing.*;
import java.util.Random;
class JumbledImage extends Component
{
private int numlocs = 2;
private int numcells = numlocs*numlocs;
private int[] cells;
private BufferedImage bi;
int w, h, cw, ch;
public JMenuBar createMenuBar()
{
JMenuBar menuBar;
JMenuItem menuItem;
JMenu menu, submenu;
//Create the menu bar.
menuBar = new JMenuBar();
//Build the first menu.
menu = new JMenu("File");
menu.setMnemonic(KeyEvent.VK_A);
menu.getAccessibleContext().setAccessibleDescription(
"The only menu in this program that has menu items");
menuBar.add(menu);
//a group of JMenuItems
menuItem = new JMenuItem("Open",
KeyEvent.VK_T);
menuItem.setAccelerator(KeyStroke.getKeyStroke(
KeyEvent.VK_1, ActionEvent.ALT_MASK));
menuItem.getAccessibleContext().setAccessibleDescription(
"This doesn't really do anything");
menu.add(menuItem);
return menuBar;
}
public JumbledImage(URL imageSrc)
{
try
{
bi = ImageIO.read(imageSrc);
w = bi.getWidth(null);
h = bi.getHeight(null);
}
catch (IOException e)
{
System.out.println("Image could not be read");
System.exit(1);
}
cw = w/numlocs;
ch = h/numlocs;
cells = new int[numcells];
for (int i=0;i<numcells;i++)
{
cells[i] = i;
}
}
void jumble()
{
Random rand = new Random();
int ri;
for (int i=0; i<numcells; i++)
{
while ((ri = rand.nextInt(numlocs)) == i);
int tmp = cells[i];
cells[i] = cells[ri];
cells[ri] = tmp;
}
}
public Dimension getPreferredSize()
{
return new Dimension(w, h);
}
public void paint(Graphics g)
{
int dx, dy;
for (int x=0; x<numlocs; x++)
{
int sx = x*cw;
for (int y=0; y<numlocs; y++)
{
int sy = y*ch;
int cell = cells[x*numlocs+y];
dx = (cell / numlocs) * cw;
dy = (cell % numlocs) * ch;
g.drawImage(bi,
dx, dy, dx+cw, dy+ch,
sx, sy, sx+cw, sy+ch,
null);
}
}
}
}
public class JumbledImageApplet extends JApplet
{
static String imageFileName = "img.jpg";
private URL imageSrc;
private JumbledImage jumbledImage;
public JumbledImageApplet ()
{
}
public JumbledImageApplet (URL imageSrc)
{
this.imageSrc = imageSrc;
}
public void init()
{
try
{
imageSrc = new URL(getCodeBase(), imageFileName);
}
catch (MalformedURLException e)
{
}
buildUI();
}
public void buildUI()
{
final JumbledImage ji = new JumbledImage(imageSrc);
add("Center", ji);
JButton jumbleButton = new JButton("Jumble");
jumbleButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
JButton b = (JButton)e.getSource();
ji.jumble();
ji.repaint();
};
});
Dimension jumbleSize = ji.getPreferredSize();
resize(jumbleSize.width, jumbleSize.height+40);
add("South", jumbleButton);
}
public static void main(String s[])
{
JFrame f = new JFrame("Jumbled Image");
f.addWindowListener
(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
URL imageSrc = null;
try {
imageSrc = ((new File(imageFileName)).toURI()).toURL();
} catch (MalformedURLException e) {
}
JumbledImageApplet jumbler = new JumbledImageApplet(imageSrc);
jumbler.buildUI();
f.add("Center", jumbler);
f.pack();
f.setVisible(true);
}
}