import java.util.* ;
import java.io.* ;


public class Driver {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("Hi") ;


// File dir = new File("directoryName");
File dir = new File("./") ;

   

    String[] children = dir.list();
    if (children == null) {
        // Either dir does not exist or is not a directory
    } else {
        for (int i=0; i<children.length; i++) {
            // Get filename of file or directory
            String filename = children[i];
            System.out.println(filename) ;
        }
    }
    
    
    
    System.out.println("\n List only those that are files") ;
    // or handle as files
    File[] theFiles = dir.listFiles();
    for (int i = 0 ; i < theFiles.length ;i++)
    {
    	if ( theFiles[i].isFile() )
    		System.out.println(theFiles[i].getName()) ;
    }


    System.out.println("\n\n2nd List:") ;
    
    
   

   

    // It is also possible to filter the list of returned files.
    // This example does not return any files that start with `.', 
    // nor files named "bin" , nor files named "src"
    
    FilenameFilter filter = new FilenameFilter() {
        public boolean accept(File dir, String name) {
            return ( !name.startsWith(".")  && !name.equals("bin") && !name.equals("src") );
        }
    };
    children = dir.list(filter);
    for (int i=0; i<children.length; i++) {
            // Get filename of file or directory
            System.out.println(children[i]) ;
        }
    
    In in;
    // now lets open each of the files and echo the contents to the screen
    for (int i=0; i<children.length; i++) 
    {
        // Get filename of file or directory
        System.out.println("\n\nContents of file named " + children[i] + " are:") ;
        
        try {
            in = new In(children[i]);
            while (!in.isEmpty()) {
                String s = in.readString();
                System.out.println(s);
            }
        }
        catch (Exception e) { }
    }
    

   

   

   

  
}

}