error with FileOutputStream

Question

I'm having trouble with the following code. I'm trying to write to a .ppm file, and I get

"Red.java:6: unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown" FileOutputStream fout = new FileOutputStream(fileName); ^ Any ideas?

import java.io.*;

public class Red {

public static void main(String args[]) {

String fileName = "RedDot.ppm"; 
FileOutputStream fout = new FileOutputStream(fileName); 
DataOutputStream out = new DataOutputStream(fout);

System.out.print("P6 1 1 255 ");
    System.out.write(255);
    System.out.write(0);
    System.out.write(0);
    System.out.flush();
}

}

Answer 1

Th FileNotFoundException is a checked exception. You need to enclose the code that trys to write to the file in a try/catch block, or throw the exception.

Answer 2

Are you writing your code in Notepad? Try using Eclipse. It would underline the code that has the problem with uncaught exception and then you could just place the cursor in the underlined section (the line that gives errors), press Ctrl+1 for a list of solutions, and pick one on the list. I suppose surrounding the block with a try{}catch{} would hush the exception, unless you -want- to do something about it.

Answer 3

The simplest solution is to rewrite your main declaration thus:

public static void main(String args[]) throws FileNotFoundException {...

thus indicating that it may throw this exception if it can't create the outputstream (for whatever reason). Note that FileNotFoundException is not the best name for the exception in this circumstance, but that's a naming issue you can't deal with.

In fact you will probably want to declare IOException in the main() throws clause above. The different methods you're calling will be declared as throwing variants of this.

Answer 4

FileNotFoundException is not handled in the code. Adding FileOutputStream fout = new FileOutputStream(fileName); between try catch block would solve the problem.

import java.io.*;
public class Red {
    public static void main(String args[]) {

    String fileName = "RedDot.ppm"; 
    try
    {
     FileOutputStream fout = new FileOutputStream(fileName);
     DataOutputStream out = new DataOutputStream(fout);
    }catch(FileNotFoundException fnfExcep){
     System.out.println("Exception Occurred " + fnfExcep.getMessage() );
    }
    System.out.print("P6 1 1 255 ");
        System.out.write(255);
        System.out.write(0);
        System.out.write(0);
        System.out.flush();
    }
}