CareerCup

Is it the right way?? please suggest. :)
=====================================

package com.amazon.universe.main;

import java.io.File;
import java.util.LinkedList;
import java.util.Queue;

public class FindFileswithGivenExtension {

	public static void main(String[] args) {

		/*define the appropriate file path here*/
		File file = new File("D:\\G_Mlab\\neural_network"), temp;
		Queue<File> allFiles = new LinkedList<File>();
		allFiles.add(file);
		File[] files = null;
		while (!allFiles.isEmpty()) {
			temp = allFiles.poll();
			files = temp.listFiles();
			for (File innerFile : files) {
				if (innerFile.isDirectory())
					allFiles.add(innerFile);
				else if (innerFile.isFile()
						&& innerFile.getName().endsWith(".pdf")) {
					System.out.println(innerFile.getAbsolutePath());
				}
			}
		}
		System.out.println(files.length);
	}

}

Is it the correct way as expected.

package com.amazon.universe.main;

import java.io.File;
import java.util.LinkedList;
import java.util.Queue;

public class FindFileswithGivenExtension {

	public static void main(String[] args) {
		/* define the appropriate file path here*/
		File file = new File("D:\\G_Mlab\\neural_network"), temp;
		Queue<File> allFiles = new LinkedList<File>();
		allFiles.add(file);
		File[] files = null;
		while (!allFiles.isEmpty()) {
			temp = allFiles.poll();
			files = temp.listFiles();
			for (File innerFile : files) {
				if (innerFile.isDirectory())
					allFiles.add(innerFile);
				else if (innerFile.isFile()
						&& innerFile.getName().endsWith(".pdf")) {
					System.out.println(innerFile.getAbsolutePath());
				}
			}
		}
		System.out.println(files.length);
	}

}

The interviewer is probably interested if you can use bash instead of coding something already implemented very well If this is the case than I would reply something like:

find temp/reg -name '*.c'