Develop Reference

Is there a way to collect data in multiple excel files?

there are 12 excel files that contain different products sales data, I try to sum up each month and entire year's sales using java but I can't add up sales for the whole year. Is there a way to do that? Thanks for your help.
public class Main {
public static void listOfSales(String fileName,String month){
List<PriceList> list = readsListFroExcel(fileName);
int sumOfInYearSale = 0;
int sumOfInOnlineSale =0;
int sumOfTotalMonthlySale = 0;
for (PriceList x : list){
sumOfInYearSale = sumOfInYearSale + x.getTotalPhysicalSale();
sumOfInOnlineSale = sumOfInYearSale + x.getTotalOnlineSale();
}
System.out.println(month +" Physical Sales : "+sumOfInYearSale);
System.out.println(month+ " Online Sales :" +sumOfInOnlineSale);
}
private static List<PriceList> readsListFroExcel(String fileName) {
List<PriceList> list = new ArrayList<>();
Path pathTofile = Paths.get(fileName);
try (BufferedReader br = Files.newBufferedReader(pathTofile)){
String headerLine = br.readLine();
String line = br.readLine();
while (line!=null){
String[] attributes = line.split(",");
PriceList listOfPrice = createList(attributes);
list.add(listOfPrice);
line = br.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
return list;
}
}

NoSuchElement Exception in Thread in TextFile Program

Hi. I'm having the issue in an error of exception. I don't know what is wrong. But please help me fix this. I'm trying to store data from the file to ArrayList and display the data in the ArrayList. Here, I attached my code and data Code and data source.

the NoSuchElementException appears because you are calling input.nextToken(); while input doesn't have any token.It's due to the last empty line of your file listbook.txt. By deleting this line, the exception shouldn't appear.
A proper manner could be to ensure that you have sufficient tokens to retrieve all your fields for a given line.
public class TextFile
{
public static void main(String[] args)
{
try
{
FileReader read = new FileReader("C:\\Users\\ogawi\\Downloads\\listbook.txt");
BufferedReader bf = new BufferedReader(read);
Book B = new Book();
ArrayList<Book> bookList = new ArrayList<Book>();
String data = null;
StringTokenizer input = null;
while((data = bf.readLine()) != null)
{
input = new StringTokenizer(data,";");
//we ensure that we have enough tokens to retrieve all fields
if(input.countTokens() == 6)
{
String title = input.nextToken();
String author = input.nextToken();
String publisher = input.nextToken();
String genre = input.nextToken();
int year = Integer.parseInt(input.nextToken());
int page = Integer.parseInt(input.nextToken());
B = new Book(title, author, publisher, genre, year, page);
bookList.add(B);
}
}
//This part of code has been moved outside the while loop
//to avoid to print the total content of the array each time
//an element is added
int count=0;
for(int i=0;i<bookList.size();i++)
{
B = (Book)bookList.get(i);
System.out.println(B.toString());
System.out.println("=============================");
count++;
}
System.out.println("Number of Books: " + count);
bf.close();
}
catch(FileNotFoundException fnf)
{ System.out.println(fnf.getMessage());}
catch(EOFException eof)
{ System.out.println(eof.getMessage());}
catch(IOException io)
{ System.out.println(io.getMessage());}
finally
{ System.out.println("System end here..TQ!!");}
}
}

This issue is due to the extra line without book information:
You can see the line 31 and 32 in above figure.
To solve this issue you can add one if condition data.contains(";") . Text file has ; delimiter if we check the condition if given line has ; delimiter then it won't cause an issue.
while ((data = bf.readLine()) != null) {
if (data.contains(";")) {
input = new StringTokenizer(data, ";");
String title = input.nextToken();
String author = input.nextToken();
String publisher = input.nextToken();
String genre = input.nextToken();
int year = Integer.parseInt(input.nextToken());
int page = Integer.parseInt(input.nextToken());
B = new Book(title, author, publisher, genre, year, page);
bookList.add(B);
int count = 0;
for (int i = 0; i < bookList.size(); i++) {
B = (Book) bookList.get(i);
System.out.println(B.toString());
System.out.println("=============================");
count++;
}
System.out.println("Number of Books: " + count);
}
}
Here is the screenshot for successful execution of the code.

Read txt file and return an array of objects that has multiple fields

I have a text file, in which each line is an Movie instance, and Movie object's fields are separated by a tab.
I need to read it and return an array of object (each line), that has multiple fields. I don't know how to make the array of Movie object ( i.e. Movie[]) and return it.
Sample text file I'm reading:
id title price
001 titanic 2
002 lady bird 3
The following is what I've got so far.
public class Loader {
//private String csvFile;
private static final Resource tsvResource = new ClassPathXmlApplicationContext().getResource("classpath:movies.txt");
private static InputStream movieIS = null;
public Loader() {
try {
movieIS = tsvResource.getInputStream();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static Movie[] loadMovies() {
BufferedReader br = null;
String line = "";
String[] tempArray = new String[100];
int id;
String title;
String rating;
String synopsis;
String genre;
String director;
String[] actors;
int price;
int runtime;
int index = 0;
try {
br = new BufferedReader(new InputStreamReader(movieIS));
while ((line = br.readLine()) != null) {
index++;
String[] data = line.split("\\t");
id = Integer.parseInt(data[0]);
title = data[1];
rating = data[2];
synopsis = data[3];
genre = data[4];
director = data[5];
actors = data[6].split(";");
price = Integer.parseInt(data[7]);
runtime = Integer.parseInt(data[8]);
}
String[] lines = new String[index];
for (int i = 0; i < index; i++) {
lines[i] = br.readLine();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null)
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return;
}
}

You've almost got this. You can create the Movie object from the fields you've extracted (like title, rating , synopsis, actors etc.) and add them to your array.
Also I'd suggest you to use ArrayList instead of array for your movies (unless you're absolute sure of the number of movies you'd have)
Your loadMovies method would look like this:
public static List<Movie> loadMovies() {
// Initialize your movie list
List<Movie> movieList = new ArrayList<>();
String line = "", title, rating, synopsis, genre, director;
int id, price, runtime, index = 0;
String[] actors;
try (BufferedReader br = new BufferedReader(new InputStreamReader(movieIS))) {
while ((line = br.readLine()) != null) {
index++;
String[] data = line.split("\\t");
id = Integer.parseInt(data[0]);
title = data[1];
rating = data[2];
synopsis = data[3];
genre = data[4];
director = data[5];
actors = data[6].split(";");
price = Integer.parseInt(data[7]);
runtime = Integer.parseInt(data[8]);
// Create your Movie object here,
// note that I'm using constructor here,
// You can also use setters for optional fields as well
Movie movie = new Movie(id, title, rating, synopsis, genre, director, actors, price, runtime);
movieList.add(movie);
}
String[] lines = new String[index];
for (int i = 0; i < index; i++) {
lines[i] = br.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
//return movieList
return movieList;
}
Note that I've combined the variable declarations and try-catch blocks as well in your original code.

Do something like
ArrayList <> al = new ArrayList<Movie>();
int index = 0;
try{
br=new BufferedReader(new InputStreamReader(movieIS));
while((line=br.readLine())!=null){
index++;
String[] data=line.split("\\t");
id =Integer.parseInt(data[0]);
title=data[1];
rating=data[2];
synopsis=data[3];
genre=data[4];
director=data[5];
actors=data[6].split(";");
price= Integer.parseInt(data[7]);
runtime=Integer.parseInt(data[8]);
Movie mv = new Movie();
// load into mv
al.add(mv);
}
}
and return at the end like this:
return al.toArray();

java read text file column headers in random order

I recieve a file each day that:
is stab delimited
has 5 or more columns
has 3 common columns - lastName, firstName, address
Problem: the column order of the file changes regularly
Goal: print column data for lastName, firstName, address regardless of column order
I have been using the following code and manually changing the datavalues to match the columns.
testfile1.txt
1st day file format
ID lastName address phone firstName
45 Gates 111 some lane 777-888-9999 Bill
2nd day file format
address ID phone firstName lastName
111 some lane 81 444-555-1111 John Doe
-
import java.io.BufferedReader;
import java.io.FileReader;
public class test2 {
public static void main(String args[]) throws Exception {
String dataFileName = "C:/testfiles/testfile1.txt";
String line;
int lineNumber = 0;
BufferedReader bReader = new BufferedReader(new FileReader(dataFileName));
bReader.readLine();
while ((line = bReader.readLine()) != null) {
lineNumber++;
String datavalue[] = line.split("\t");
String lastName = datavalue[1];
String firstName = datavalue[5];
String address = datavalue[3];
System.out.println(lastName + "'" + firstName + "," + address);
}
}
}

This is a first approach. I would try it somehow like this:
int colLastName, colFirstName, colAddress;
line = bReader.readLine();
String columnOrder []= line.split("\t");
for (int i=0; i< columnOrder.length; i++){
if (columnOrder[i].equals("lastName")){
colLastName = i;
}
else if (columnOrder[i].equals("firstName"){
colFirstName = i;
}
else if (columnOrder[i].equals("address"){
colAddress = i;
}
}
while ((line = bReader.readLine()) != null) {
lineNumber++;
String datavalue[] = line.split("\t");
String lastName = datavalue[colLastName];
String firstName = datavalue[colFirstName];
String address = datavalue[colAddress];
System.out.println(lastName + "'" + firstName + "," + address);
}

I think you can try something like below -
import java.io.BufferedReader;
import java.io.FileReader;
public class test2 {
public static void main(String args[]) throws Exception {
String dataFileName = "C:/testfiles/testfile1.txt";
String line;
boolean isFirstColumn = true;
BufferedReader bReader = new BufferedReader(new FileReader(dataFileName));
int[] order_Fname_Lname_Address = new int[3];
while ((line = bReader.readLine()) != null) {
String datavalue[] = line.split("\t");
if(isFirstColumn) {
for (int i = 0; i < datavalue.length; i++) {
switch (datavalue[i]) {
case "firstName":
order_Fname_Lname_Address[0] = i;
break;
case "lastName":
order_Fname_Lname_Address[1] = i;
break;
case "address":
order_Fname_Lname_Address[2] = i;
break;
}
}
isFirstColumn = false;
continue;
}
String firstName = datavalue[order_Fname_Lname_Address[0]];
String lastName = datavalue[order_Fname_Lname_Address[1]];
String address = datavalue[order_Fname_Lname_Address[2]];
System.out.println(lastName + " " + firstName + "," + address);
}
bReader.close();
}
}

How to read from a text-file.

I would like to know how can I check for a specific string on a line of a text file, save it in an array, and then move on to the next line of that text file.
For e.g.:
(what he is/ year edition/name/age/profession/number)
competitor 2014 joseph 21 student 20232341
competitor 2013 michael 23 engineer 23425123
As output, it would give me this:
Song Festival'2014
here are the competitors:
Joseph, student of 21 years - 20232341
Song Festival'2013
are the competitors
Michael, engineer of 23 years - 23425123
edit: java language

For this you would use a BufferedReader, you can format things in the text file using the tab (indent) which would be read from the BufferedReader as '\t' I'll write an example for you in a moment.
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class StackoverflowExample {
private static final int INFORMATION_CAP = 100;
private static String[][] INFORMATION = new String[INFORMATION_CAP][INFORMATION_CAP];
public StackoverflowExample() {
String currentLine;
String[] textData;
int lineID = 0;
boolean endOfFile = false;
try {
BufferedReader reader = new BufferedReader(new FileReader("textfile.txt"));
currentLine = reader.readLine();
while(!endOfFile && currentLine != null) {
currentLine = currentLine.trim();
textData = currentLine.split("\\t");
String userType = textData[0];
String year = textData[1];
String name = textData[2];
String age = textData[3];
String profession = textData[4];
String number = textData[5];
INFORMATION[lineID] = new String[] { userType, year, name, age, profession, number };
lineID++;
currentLine = reader.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
new StackoverflowExample();
for(int i = 0; i < INFORMATION.length; i++) {
System.out.println("Type: " + INFORMATION[i][0] +
"year: " + INFORMATION[i][1] +
"name: " + INFORMATION[i][2] +
"age: " + INFORMATION[i][3] +
"profession: " + INFORMATION[i][4] +
"number: " + INFORMATION[i][5]);
}
}
}
Create a text file called "textfile.txt" in your projects main directory, and format it like this
type(tab)year(tab)name(tab)age(tab)profession(tab)number(newline)