Problem : How you can display list of  file names for a given directory?

Contents

1. 1 Program :
   1. 1.1 Step 1 - Coding
   2. 1.2 Step 2 - Deployment
   3. 1.3 Step 3 - Testing
   4. 1.4 Output

Solution : java.io.File class has a method listFiles() to get list of  file  and sub-directories  java.io.File objects.

Program :

Step 1 - Coding

Create a text file c:/sunilos/DirFolder.java  and copy below contents.

import java.io.File;
/**
 * A program to display files from a folder.
 */
public class DirFolder {

    public static void main(String[] args) {
        File directoy = new File("c:/sunilos");
        File[] list = directoy.listFiles();
        for(int i = 0; i<list.length;i++){
            if(list[i].isFile()){
                System.out.println((i+1) + ": " +list[i].getName());
            }
        }
    }

}

Step 2 - Deployment

1. Create a folder 'c:\sunilos'. 
2. Create or copy DirFolder.java into 'c:\sunilos' folder.
3. Open your command prompt and go to  'c:\sunilos'
   
4. Compile DirFolder.java with help of 
• javac DirFolder.java command.  Command will create DirFolder.class file in the same folder.
  
5. Congratulations!! your Java program is ready to serve.

Step 3 - Testing

1. Make sure you are on Command Prompt under c:\sunilos directory
   
2. Now start your java program from command prompt with help of 
• java DirFolder command.

Output

1: sunilos.txt
2: sunilos-write.txt
3: sunilos-copy.txt


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