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Is there a way to have a directory run through the main program?

I am having difficulty passing a directory to the code below. When I am prompted to enter a directory, I do as shown below: C:\Users. I get a 0 byte output, which is not accurate. Meaning that the program is not registering the typed directory.
code:
//import jdk.internal.icu.text.UnicodeSet;
import java.io.File;
import java.util.Scanner;
import java.util.Queue;
import java.util.LinkedList;
public class Hwk2018
{
public static void main(String[] args)
{
//String s = "C:\\Users\\
//File filess = new File(s);
System.out.println("Enter a directory or a file: ");
Scanner input = new Scanner(System.in);
String directory = input.nextLine();
Hwk2018 obj = new Hwk2018();
System.out.println(obj.getSize(new File(directory)) + " bytes");
}
int i = 0;
Queue<File> que = new LinkedList<>();
public long getSSize(File directory)
{
long size = 0;
que.add(directory);
while(!que.isEmpty())
{
File t = que.poll();
if(!t.isDirectory())
{
size += t.length();
}
else
{
//for(int i = 0; )
que.add(directory);
}
}
return size;
}
public static long getSize(File file)
{
long size = 0;
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; files != null && i < files.length; i++) {
size += getSize(files[i]);
}
} else {
size += file.length();
}
return size;
}
}
output when running ' MBP src % java Hwk2018 ' on the terminal and subsequently typing C:\Users:
0 bytes
Expected Output:
87 bytes (or some numerical value other than 0)

I would use File#exists to verify that the user input is a valid path, you could also add File#isDirectory check, but since getSize is doing this, it's probably not required.
subsequently typing C:\Users:
I'm using a Mac
Mac's don't have a concept of "drives" like windows, they have "volumes" and as such it should probably be /Users, but you could run into other issues, since you won't have read access to other users.
The following will print the path of your "home" directory and also uses File#exist to verify the user input
import java.io.File;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
//String s = "C:\\Users\\
//File filess = new File(s);
String directory = System.getProperty("user.home");
System.out.println("Your home directory is [" + directory + "]");
System.out.println("Enter a directory or a file: ");
Scanner input = new Scanner(System.in);
directory = input.nextLine();
File parent = new File(directory);
if (parent.exists()) {
Main obj = new Main();
System.out.println(obj.getSize(new File(directory)) + " bytes");
} else {
System.out.println(directory + " is not a valid directory");
}
}
public static long getSize(File file) {
long size = 0;
System.out.println("Scanning " + file.getName());
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; files != null && i < files.length; i++) {
size += getSize(files[i]);
}
} else {
size += file.length();
}
return size;
}
}

Java how to read files recursive

I want to read all files recursive inside a given path and show the path and Byte size in the output of every single File.

public class ReadFilesInPathRecursion {
public void listFiles (String startDir) {
File dir = new File(startDir);
File[] files = dir.listFiles();
if (files!=null && files.length >= 0) {
for(File file : files) {
if(file.isDirectory()) {
listFiles(file.getAbsolutePath()); // Recursion (absolute)
} else {
System.out.println(file.getName() + " (size in bytes: " + file.length() + ") " + "(path: " + file.getAbsoluteFile() + ")");
}
}
}
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
ReadFilesInPathRecursion test = new ReadFilesInPathRecursion();
String startDir = sc.next();
test.listFiles(startDir);
}

How to get the path of a file but without the actual file name

For example C:\Desktop and not C:\Desktop\file.txt.
Here's the code, what can i do to get only the path excluding the actual name of the file or do i have to mechanically remove the name part(String) with the split("\") method.
import java.io.*;
public class FilesInfo {
File file = new File("C:\\Users\\CCKS\\Desktop\\1");
public void viewFiles() throws IOException {
File[] files = file.listFiles();
String path = "";
for(int i = 0; i < files.length; i++){
if(!files[i].isDirectory()){
System.out.println("[DIRECTORY]" + files[i].getPath() + " [NAME] " + files[i].toString() + " [SIZE] " + files[i].length() + "KB");
} else {
path = files[i].getAbsolutePath();
file = new File(path);
}
}
if(path.equals("")){
return;
} else {
viewFiles();
}
}
public static void main(String [] args){
try {
new FilesInfo().viewFiles();
} catch (Exception e){
e.printStackTrace();
}
}
}

Like this,
File file = new File("C:\Desktop\file.txt");
String parentPath= file.getParent();

File file = new File( "C:/testDir/test1.txt" );
String justPath = file.getParent();

how recursively to add some .txt files from a folder and sub folder's in Java

I have been trying to use some data from some txt files (I want to find some words in these txt files) from a folder and sub folder's recursively (I have to find these txt files from some folders that all of them are in the same folder) in Java, how can I do it?

void processInput(final String directoryName) {
final File inputDirectory = new File(directoryName);
for (final String inputFile : inputDirectory.list()) {
final File file = new File(directoryName + File.separator
+ inputFile);
if (file.isDirectory()) {
processInput(directoryName + File.separator + inputFile);
} else {
processFile(file);
}
}
}

I think this is good way for do it:
private static void addfiles (File input,ArrayList<File> files)
{
if(input.isDirectory())
{
ArrayList <File> path = new ArrayList<File>(Arrays.asList(input.listFiles()));
for(int i=0 ; i<path.size();++i)
{
if(path.get(i).isDirectory())
{
addfiles(path.get(i),files);
}
if(path.get(i).isFile())
{
String name=(path.get(i)).getName();
if(name.lastIndexOf('.')>0)
{
int lastIndex = name.lastIndexOf('.');
String str = name.substring(lastIndex);
if(str.equals(".txt"))
{
files.add(path.get(i));
}
}
}
}
}
if(input.isFile())
{
String name=(input.getName());
if(name.lastIndexOf('.')>0)
{
int lastIndex = name.lastIndexOf('.');
String str = name.substring(lastIndex);
if(str.equals(".txt"))
{
files.add(input);
}
}
}
}

Scanner from file doesn't seem to be reading file

I'm doing a Phone Directory project and we have to read from a directory file telnos.txt
I'm using a Scanner to load the data from the file telnos.txt, using a loadData method from a previous question I asked here on StackOverflow.
I noticed attempts to find a user always returned Not Found, so I added a few System.out.printlns in the methods to help me see what was going on. It looks like the scanner isn't reading anything from the file. Weirdly, it is printing the name of the file as what should be the first line read, which makes me think I've missed something very very simple here.
Console
run:
telnos.txt
null
loadData tested successfully
Please enter a name to look up: John
-1
Not found
BUILD SUCCESSFUL (total time: 6 seconds)
ArrayPhoneDirectory.java
import java.util.*;
import java.io.*;
public class ArrayPhoneDirectory implements PhoneDirectory {
private static final int INIT_CAPACITY = 100;
private int capacity = INIT_CAPACITY;
// holds telno of directory entries
private int size = 0;
// Array to contain directory entries
private DirectoryEntry[] theDirectory = new DirectoryEntry[capacity];
// Holds name of data file
private final String sourceName = "telnos.txt";
File telnos = new File(sourceName);
// Flag to indicate whether directory was modified since it was last loaded or saved
private boolean modified = false;
// add method stubs as specified in interface to compile
public void loadData(String sourceName) {
Scanner read = new Scanner("telnos.txt").useDelimiter("\\Z");
int i = 1;
String name = null;
String telno = null;
while (read.hasNextLine()) {
if (i % 2 != 0)
name = read.nextLine();
else
telno = read.nextLine();
add(name, telno);
i++;
}
}
public String lookUpEntry(String name) {
int i = find(name);
String a = null;
if (i >= 0) {
a = name + (" is at position " + i + " in the directory");
} else {
a = ("Not found");
}
return a;
}
public String addChangeEntry(String name, String telno) {
for (DirectoryEntry i : theDirectory) {
if (i.getName().equals(name)) {
i.setNumber(telno);
} else {
add(name, telno);
}
}
return null;
}
public String removeEntry(String name) {
for (DirectoryEntry i : theDirectory) {
if (i.getName().equals(name)) {
i.setName(null);
i.setNumber(null);
}
}
return null;
}
public void save() {
PrintWriter writer = null;
// writer = new PrintWriter(FileWriter(sourceName));
}
public String format() {
String a;
a = null;
for (DirectoryEntry i : theDirectory) {
String b;
b = i.getName() + "/n";
String c;
c = i.getNumber() + "/n";
a = a + b + c;
}
return a;
}
// add private methods
// Adds a new entry with the given name and telno to the array of
// directory entries
private void add(String name, String telno) {
System.out.println(name);
System.out.println(telno);
theDirectory[size] = new DirectoryEntry(name, telno);
size = size + 1;
}
// Searches the array of directory entries for a specific name
private int find(String name) {
int result = -1;
for (int count = 0; count < size; count++) {
if (theDirectory[count].getName().equals(name)) {
result = count;
}
System.out.println(result);
}
return result;
}
// Creates a new array of directory entries with twice the capacity
// of the previous one
private void reallocate() {
capacity = capacity * 2;
DirectoryEntry[] newDirectory = new DirectoryEntry[capacity];
System.arraycopy(theDirectory, 0, newDirectory,
0, theDirectory.length);
theDirectory = newDirectory;
}
}
ArrayPhoneDirectoryTester.java
import java.util.Scanner;
public class ArrayPhoneDirectoryTester {
public static void main(String[] args) {
//create a new ArrayPhoneDirectory
PhoneDirectory newTest = new ArrayPhoneDirectory();
newTest.loadData("telnos.txt");
System.out.println("loadData tested successfully");
System.out.print("Please enter a name to look up: ");
Scanner in = new Scanner(System.in);
String name = in.next();
String entryNo = newTest.lookUpEntry(name);
System.out.println(entryNo);
}
}
telnos.txt
John
123
Bill
23
Hello
23455
Frank
12345
Dkddd
31231

In your code:
Scanner read = new Scanner("telnos.txt");
Is not going to load file 'telnos.txt'. It is instead going to create a Scanner object that scans the String "telnos.txt".
To make the Scanner understand that it has to scan a file you have to either:
Scanner read = new Scanner(new File("telnos.txt"));
or create a File object and pass its path to the Scanner constructor.
In case you are getting "File not found" errors you need to check the current working directory. You could run the following lines and see if you are indeed in the right directory in which the file is:
String workingDir = System.getProperty("user.dir");
System.out.println("Current working directory : " + workingDir);
You need to also catch the FileNotFoundException in the function as follows:
public void loadData(String sourceName) {
try {
Scanner read = new Scanner(new File("telnos.txt")).useDelimiter("\\Z");
int i = 1;
String name = null;
String telno = null;
while (read.hasNextLine()) {
if (i % 2 != 0)
name = read.nextLine();
else {
telno = read.nextLine();
add(name, telno);
}
i++;
}
}catch(FileNotFoundException ex) {
System.out.println("File not found:"+ex.getMessage);
}
}

You are actually parsing the filename not the actual file contents.
Instead of:
new Scanner("telnos.txt")
you need
new Scanner( new File( "telnos.txt" ) )
http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html