Image won't display in JFrame - image

Question

I am trying to get an image to display inside my JFrame and having no success. I have followed the Oracle tutorial exactly and I get a NullPointerException:
Exception in thread "main" java.lang.NullPointerException
at net.ultibyte.TheDo.CreateLoginScreen.DisplayImage(CreateLoginScreen.java:35)
at net.ultibyte.TheDo.CreateLoginScreen.main(CreateLoginScreen.java:41)
Below is my code.
public class CreateLoginScreen extends JFrame {
CreateLoginScreen() {
setTitle("TheDo");
setSize(1280, 720);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static Image loadImage() {
Image i = null;
try {
i = ImageIO.read(new File("src/resources/LoginScreen.png"));
} catch (IOException e) {
}
return i;
}
public static void DisplayImage(Image i) {
Graphics g = i.getGraphics();
g.drawImage(i, 0, 0, null);
}
public static void main(String[] args) {
CreateLoginScreen a = new CreateLoginScreen();
DisplayImage(loadImage());
}
}
And the image is named "LoginScreen.png", and is located in a package called "resources" which is in the src folder.
I have no idea what's wrong and would very much appreciate any help :).
Update: Corrected file path, pointed out by peeskillet. This fixed the NullPointerException. Still won't display image though.

Answer 1

"located in a package called "resources" which is in the src folder."
You need to use this file path. "src/resources/LoginScreen.png"
Your IDE will first look in the main project folder. since src is direct child of the project root, you need to add that to the path
EDIT
"The window loads up but no image is displayed. Any idea on this? "
Yes, you need to override a paint method in order to draw the image on to the component. I wouldn't use JFrame though. I would use a JPanel and override the paintComponent method.
Try this out
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
class JPanelTemplate extends JPanel {
private static final int SCREEN_WIDTH = 400;
BufferedImage img;
public JPanelTemplate() {
try {
img = ImageIO.read(new File("src/resources/LoginScreen.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, this);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(SCREEN_WIDTH, SCREEN_WIDTH);
}
private static void createAndShowGui() {
JFrame frame = new JFrame();
frame.add(new JPanelTemplate());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}