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Have made this program that should open an image on my desktop but it gives me the error java.lang.ArrayIndexOutOfBoundsException when I run it. What I done wrong?

import java.awt.BorderLayout; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; import javax.swing.WindowConstants; public class Image { public static void main(String[] args) throws Exception { new Image(args[0]); } public Image(final String filename) throws Exception { SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame editorFrame = new JFrame("C:/Users/Username/Desktop/index.jpg"); editorFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); BufferedImage image = null; try { image = ImageIO.read(new File(filename)); } catch (Exception e) { e.printStackTrace(); System.exit(1); } ImageIcon imageIcon = new ImageIcon(image); JLabel jLabel = new JLabel(); jLabel.setIcon(imageIcon); editorFrame.getContentPane().add(jLabel, BorderLayout.CENTER); editorFrame.pack(); editorFrame.setLocationRelativeTo(null); editorFrame.setVisible(true); } }); }

What do I get this error: 

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 at Image.main(Image.java:15)
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  • 2
    Have you passed in any parameters? Commented Jul 6, 2015 at 14:45
  • 1
    It seems that you don’t pass an argument when running the program. Commented Jul 6, 2015 at 14:45
  • Ok, how do I do that? Commented Jul 6, 2015 at 15:06
  • 1
    possible duplicate of Input In Java- How does it work? Commented Jul 6, 2015 at 15:07

2 Answers 2

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1

You have to pass command line argument to main() method. That argument we are passing through Image() constructor.

new Image(args[0]);

Please take a look on Command Line concept below.

What is Command Line Argument?

A Java application can accept any number of arguments from the command line. Those arguments called as Command Line Arguments. This allows the user to specify configuration information when the application is launched.

How to pass command line arguments?

The user enters command-line arguments when invoking the application and specifies them after the name of the class to be run.

For example, suppose a Java application called Sort sorts lines in a file. To sort the data in a file named friends.txt, a user would enter:

java Sort friends.txt

Here: Sort-- classname
friends.txt --- command line argument.

When an application is launched, the runtime system passes the command-line arguments to the application's main method via an array of Strings. In the previous example, the command-line arguments passed to the Sort application in an array that contains a single String: "friends.txt".

Update:

You can pass multiple command line argument with Space as a delimiter.

like 

java Sort stack.txt overflow.txt

How to pass Command line Arguments in Eclipse ?

Go to program on package explorer or Navigator view

Select that program ---> after that right click on program select Run As ---> Run Configuration ---> select Arguments second option on top ---> give arguments on Program Arguments

See the below Screen Shot:

enter image description here

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0

Look like you forget to pass the comand line args.

new Image(args[0]);
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5 Comments

Where do I have to do that?
When you are running your app. See the answer from @Anil . If you are running your app from IDE it depends which IDE you are using. Think you can google how to pass command line arguments in your particular IDE.
Did you tried to google a little? I found this info in 1 min. stackoverflow.com/questions/19646719/…
new Image(args[0]="C:/Users/Username/Desktop/index.jpg");
This line isn't executed, you application crashed before this line. On line 15. You should follow the instructions described in the answer here: stackoverflow.com/questions/19646719/… And pass your args.

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