I have an image file in my project. The hierarchy looks like this:
I'm trying to read Manling.png into Manling.java using this code:
public BufferedImage sprite;
public Manling()
{
try
{
File file = new File("resources/Manling.png");
sprite = ImageIO.read(file);
} catch (IOException e) {}
System.out.println(sprite.toString()); //This line is to test if it works
}
I always get a NullPointerException
on the println
statement, so I assume the path is wrong. I've tried moving the image to different places in the project and I've tried changing the file path (e.g. 'mine/resources/Manling.png' and '/resources/Manling.png'). Any ideas?
If you want a full compilable example, try this one:
package minesscce;
import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import java.net.URL;
public class Mine extends JFrame
{
private BufferedImage sprite;
public static void main(String args[])
{
Mine mine = new Mine();
}
public Mine()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setSize(800, 600);
setExtendedState(Frame.MAXIMIZED_BOTH);
setBackground(Color.WHITE);
try
{
File file = new File("resources/Manling.png");
sprite = ImageIO.read(file);
} catch (IOException e) {}
System.out.println(sprite.toString());
}
public void paint(Graphics g)
{
g.translate(getInsets().left, getInsets().top);
Graphics2D g2d = (Graphics2D)g;
g2d.drawImage(sprite, 0, 0, this);
Toolkit.getDefaultToolkit().sync();
g2d.dispose();
}
}
Just set up the project like this, using any image you want:
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