Converting a println out in to a method

I have a class that returns a result to command line using println (list);

THIS IS THE RESULT WHEN I RUN THE FIRST CLASS

C:\>java -cp Details.jar packages.ListFiles
C:\temp\bkdb.txt
C:\temp\nbu6.5.6\BitmapImage.bmp
C:\temp\nbu6.5.6\Something.txt
C:\temp\New Bitmap Image.bmp
C:\temp\New Text Document.txt

Code:

---

public static void main(String[] args) throws FileNotFoundException {
    // USING java.io.File
    File folder = new File("C:/temp");
    // USING java.util.List
      List<File> contents = ListFiles1.getFileListing(folder);


      // PRINT OUT THE LIST OF FILES


        for (File list : contents) {
            if (list.isFile() && list.getName().toLowerCase().endsWith(".txt")
                || list.getName().toLowerCase().endsWith(".bmp")
                || list.getName().toLowerCase().endsWith(".doc")
        )
        System.out.println(list);
        }
}

---

So I have aquestion then, can I take this code I have with a for loop on specific files and convert that to a method so that the second class can access it?

Many Thanks

You sure can. What happened when you tried?

I keep getting "cannot return a value from a method whose result type is void" but I don't know how to do otherwise. This bit of code above has taken me weeks to figure out and getting it to work as I am still learning to program java, so everything is very slow to figure it out but that is part of learning and I learn from examples :)

Returning a Value from a Method (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

db

Hi Darryl.Burke I had found that page via serching google, I unerstand what void doesn't return a value. and that is my problem as for me to capture the output and pass it on the the second class it can not be void, but I can not figure out how to change the first class to give me the same result unless I use void... catch 22

I know I need to read allot of documentation and I have been doing so but things don't always make sense.

Weel thanks for the link anyway.

So what do you want to return?
How are you calling this?
Presumably the main() method?
What are you requirements?

Hi Tolls, well I know that I need change it so that instead of pronting the files to the console, it builds a List of the file and returns it so that I can then create a second class and call the first class to get the result (list of file names)

Does that make sense? Thanks for trying to help.

Code:

---

    // USING java.io.File
    File folder = new File("C:/temp");
    // USING java.util.List
      List<File> contents = ListFiles1.getFileListing(folder);


      // PRINT OUT THE LIST OF FILES


        for (File list : contents) {
            if (list.isFile() && list.getName().toLowerCase().endsWith(".txt")
                || list.getName().toLowerCase().endsWith(".bmp")
                || list.getName().toLowerCase().endsWith(".doc")
        )
        System.out.println(list);
        }

---

take all of it out of the main method, do something like this:

Code:

---

public static void main(String[] args) {
    String output = getFileList().toString();
    System.out.println(output);
}

public static List<File> getFileList() {
    //your code
    return contents;
}

---

then from your other class you can get the same list:
firstClass.getFileList()

Essentially what ozzyman says, but you'll have to change what happens in your loop, building up a second List that will be what you return, rather than the contents List.

You guys are great, thank you for your help I managed to get it to work just like I wanted, I did change the code and moved the for loop with file extentions to the second class :)

Code:

---


import java.io.File;
import java.io.FileNotFoundException;
import java.util.List;

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

    List<File> listFiles = ScanFiles.getFileList();

    for (File aList : listFiles) {

            if (aList.isFile() && aList.getName().toLowerCase().endsWith(".txt")
                || aList.getName().toLowerCase().endsWith(".bmp")
                || aList.getName().toLowerCase().endsWith(".doc"))

    System.out.println(aList);
    }
  }
}

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