For my program I have it set up that I can edit and change values of items that are stored within my outfile in the program itself. However the numbers that they change to only update in the program itself. For example if I sell 10 ketchups than in my program i would have 0 but my outfile would still say I have 10. I need my outfile to update with my program. I came up with an override method but all it does currently is adds content on a new line within the outfile, I am not sure how I would go about actually updating any information stored on the outfile any help would be great.
Code:
public class Driver {
public static ArrayList<Item> list = new ArrayList<Item>();
static double myBalance = 100;
/*static ArrayList<Item> list = new ArrayList<Item>();*/
/**
* #param args
* #throws IOException
* #throws FileNotFoundException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
ArrayList<String> inventoryList = new ArrayList<String>();
BufferedReader readIn = null;
try {
readIn = new BufferedReader(new FileReader("inventory.out"));
readIn.lines().forEach(inventoryList::add);
} catch (Exception e) {
e.printStackTrace();
} finally {
if(readIn != null) {
readIn.close();
}
}
for (int i = 0; i < 4; i++) {
String item = inventoryList.get(i);// input String like the one you would read from a file
String delims = "[,]"; //delimiter - a comma is used to separate your tokens (name, qty,cost, price)
String[] tokens = item.split(delims); // split it into tokens and place in a 2D array.
String name = tokens[0]; System.out.println(name);
double cost = Double.parseDouble(tokens[1]);System.out.println(cost);
int qty = Integer.parseInt(tokens[2]);System.out.println(qty);
double price = Double.parseDouble(tokens[3]);System.out.println(price);
list.add(new Item(name, cost, qty, price));
}
sell("Mayo", 10);
buy("Ketchup", 20);
remove_item("Ketchup");
add_item("Tums", 20, 10, 5);
overwrite("New line");
PrintAll();
}
// Method to sell items from the arraylist
public static void sell(String itemName, int amount) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getName().equals(itemName)) {
int number = i;
list.get(number).qty -= amount;
myBalance += list.get(number).getPrice() * amount;
}
}
}
// Method to buy more of the items in our array list
public static void buy(String itemName, int amount) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getName().equals(itemName)) {
int number = i;
list.get(number).qty += amount;
myBalance -= list.get(number).getPrice() * amount;
}
}
}
// Method to remove an item completely from our inventory
public static void remove_item(String itemName) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getName().equals(itemName)) {
int number = i;
list.remove(number);
}
}
}
public static void add_item(String itemName, double itemCost, int qty, double itemPrice) {
list.add(new Item(itemName, itemCost, qty, itemPrice));
}
public static void PrintAll() {
String output = "";
for(Item i : list) {
int everything = i.getQty();
String everything2 = i.getName().toString();
output += everything +" "+ everything2 + "\n";
}
JOptionPane.showMessageDialog(null, "Your current balance is: $" + myBalance + "\n" + "Current stock:" + "\n" + output);
}
public static void overwrite(String update) {
try
{
String filename= "inventory.out";
FileWriter fw = new FileWriter(filename,true); //the true will append the new data
fw.write("\n"+"add a line");//appends the string to the file
fw.close();
}
catch(IOException ioe)
{
System.err.println("IOException: " + ioe.getMessage());
}
}
}
Outfile contents:
Ketchup,1,10,2
Mayo,2,20,3
Bleach,3,30,4
Lysol,4,40,5
If you know the name of your outfile then clear the outfile as and when you need it updated and then write to it again. You can use the below code to erase content of a file.
PrintWriter writer = new PrintWriter(file);
writer.print("");
writer.close();
Related
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;
}
}
I am trying to read an input file. Each value of the input file is inserted into the TreeMap as
If word is not existing: Insert the word to the treemap and associate the word with an ArrayList(docId, Count).
If the Word is present in the TreeMap, then check if the current DocID matches within the ArrayList and then increase the count.
THe
For the ArrayList, I created another class as below:
public class CountPerDocument
{
private final String documentId;
private final int count;
CountPerDocument(String documentId, int count)
{
this.documentId = documentId;
this.count = count;
}
public String getDocumentId()
{
return this.documentId;
}
public int getCount()
{
return this.count;
}
}
After that, I am trying to print the TreeMap into a text file as <DocID - Count>
Not sure what I am doing wrong here, but the output I get is as follows:
The Stem is todai:[CountPerDocument#5caf905d, CountPerDocument#27716f4, CountPerDocument#8efb846, CountPerDocument#2a84aee7, CountPerDocument#a09ee92, CountPerDocument#30f39991]
Wondering if anyone can guide me what i am doing wrong and if my method isn't correct what am i supposed to do?
public class StemTreeMap
{
private static final String r1 = "\\$DOC";
private static final String r2 = "\\$TITLE";
private static final String r3 = "\\$TEXT";
private static Pattern p1,p2,p3;
private static Matcher m1,m2,m3;
public static void main(String[] args)
{
BufferedReader rd,rd1;
String docid = null;
String id;
int tf = 0;
//CountPerDocument cp = new CountPerDocument(docid, count);
List<CountPerDocument> ls = new ArrayList<>();
Map<String,List<CountPerDocument>> mp = new TreeMap<>();
try
{
rd = new BufferedReader(new FileReader(args[0]));
rd1= new BufferedReader(new FileReader(args[0]));
int docCount = 0;
String line = rd.readLine();
p1 = Pattern.compile(r1);
p2 = Pattern.compile(r2);
p3 = Pattern.compile(r3);
while(line != null)
{
m1 = p1.matcher(line);
m2 = p2.matcher(line);
m3 = p3.matcher(line);
if(m1.find())
{
docid = line.substring(5, line.length());
docCount++;
//System.out.println("The Document ID is :");
//System.out.println(docid);
line = rd.readLine();
}
if(m2.find()||m3.find())
{
line = rd.readLine();
}
else
{
if(!(mp.containsKey(line))) // if the stem is not on the TreeMap
{
//System.out.println("The stem is not present in the tree");
tf = 1;
ls.add(new CountPerDocument(docid,tf));
mp.put(line, ls);
line = rd.readLine();
}
else
{
if(ls.indexOf(docid) > 0) //if its last entry matches the current document number
{
//System.out.println("The Stem is present for the same docid so incrementing docid");
tf = tf+1;
ls.add(new CountPerDocument(docid,tf));
line = rd.readLine();
}
else
{
//System.out.println("Stem is present but not the same docid so inserting new docid");
tf = 1;
ls.add(new CountPerDocument(docid,tf)); //set did to the current document number and tf to 1
line = rd.readLine();
}
}
}
}
rd.close();
System.out.println("The Number of Documents in the file is:"+ docCount);
//Write to an output file
String l = rd1.readLine();
File f = new File("dictionary.txt");
if (f.createNewFile())
{
System.out.println("File created: " + f.getName());
}
else
{
System.out.println("File already exists.");
Path path = Paths.get("dictionary.txt");
Files.deleteIfExists(path);
System.out.println("Deleted Existing File:: Creating New File");
f.createNewFile();
}
FileWriter fw = new FileWriter("dictionary.txt");
fw.write("The Total Number of Stems: " + mp.size() +"\n");
fw.close();
System.out.println("The Stem is todai:" + mp.get("todai"));
}catch(IOException e)
{
e.printStackTrace();
}
}
}
You didn't define the function String toString() in your class CountPerDocument. So, when you try to print a CountPerDocument variable, the default printed value is CountPerDocument#hashcode.
To decide how to represent a CountPerDocument variable in your code, add in your class the next function:
#Override
public String toString() {
return "<" + this.getDocumentId() + ", " + this.getCount() + ">";
}
Try to override toString method in CountPerDocument. Something like this:
public class CountPerDocument
{
private final String documentId;
private final int count;
CountPerDocument(String documentId, int count)
{
this.documentId = documentId;
this.count = count;
}
public String getDocumentId()
{
return this.documentId;
}
public int getCount()
{
return this.count;
}
#Override
public String toString() {
return documentId + "-" + count;
}
}
I am currently building a program which reads a file and prints the most occurring words and how many times each word appears like so:
package WordLookUp;
import java.util.*;
import java.io.*;
import java.lang.*;
public class WordLookUp {
private String[] mostWords;
private Scanner reader;
private String line;
private FileReader fr;
private BufferedReader br;
private List<String> original;
private String token = " ";
public WordLookUp(String file) throws Exception {
this.reader = new Scanner(new File(file));
this.original = new ArrayList<String>();
while (this.reader.hasNext()) { //reads file and stores it in string
this.token = this.reader.next();
this.original.add(token); //adds it to my arrayList
}
}
public void findMostOccurringWords() {
List<String> mostOccur = new ArrayList<String>();
List<Integer> count = new ArrayList<Integer>();
int counter = 0;
this.mostWords = this.token.split(" "); //storing read lines in mostWords arrayList
try {
for (int i = 0; i < original.size(); i++) {
if (this.original.equals(this.mostWords[i])) {
counter++; //increase counter
mostOccur.add(this.mostWords[i]);
count.add(counter);
}
}
for (int i = 0; i < mostOccur.size(); i++) {
System.out.println("Word: " + mostOccur.get(i) + " count: " + count.get(i));
}
} catch (ArrayIndexOutOfBoundsException ae) {
System.out.println("Illegal index");
}
}
}
package WordLookUp;
import java.util.*;
import java.io.*;
public class Main {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
WordLookUp wL = new WordLookUp("tiny1.txt");
wL.findMostOccurringWords();
}
}
So when I keep running my file, it throws the exception I gave it: "Illegal index". I think it is my findMostOccuringWords method. To me the logic feels correct, but I don't know why it is throwing an ArrayIndexOutOfBoundsException. I tried playing with the for loops and tried to go from int i = 0 to i < mostOccur.size() - 1 but that is not working either. Is my logic wrong ? I am not allowed to use a hashmap and our professor gave us a hint that we can do this assignment easily with arrays and ArrayLists (no other built in functions, but regexes is highly recommended for use as well for the rest of the assignment). I put a private FileReader and BufferedReader up there as I am trying to see if they would work better or not. Thanks for the advice!
Can you try to use the following codes? I think your current algorithm is wrong.
public class WordLookUp {
private List<String> original;
private List<String> mostOccur = new ArrayList<String>();
private List<Integer> count = new ArrayList<Integer>();
public WordLookUp(String file) throws Exception {
try(Scanner reader = new Scanner(new File(file));){
this.original = new ArrayList<String>();
String token = " ";
while (reader.hasNext()) { //reads file and stores it in string
token = reader.next();
this.original.add(token); //adds it to my arrayList
findMostOccurringWords(token);
}
}
}
public void findMostOccurringWords(String token) {
int counter = 0;
String[] mostWords = token.split(" "); //storing read lines in mostWords arrayList
try {
for (int i = 0; i < mostWords.length; i++) {
for(int j = 0; j < this.original.size(); j++) {
if (original.get(j).equals(mostWords[i])) {
counter++; //increase counter
}
}
if (mostOccur.contains(mostWords[i])) {
count.set(mostOccur.indexOf(mostWords[i]),counter);
}else {
mostOccur.add(mostWords[i]);
count.add(counter);
}
}
} catch (ArrayIndexOutOfBoundsException ae) {
System.out.println("Illegal index");
}
}
public void count() {
for (int i = 0; i < mostOccur.size(); i++) {
System.out.println("Word: " + mostOccur.get(i) + " count: " + count.get(i));
}
}
}
public class Main {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
WordLookUp wL = new WordLookUp("F:\\gc.log");
wL.count();
}
}
Here in this loop:
for (int i = 0; i < mostOccur.size(); i++) {
System.out.println("Word: " + mostOccur.get(i) + " count: " + count.get(i));
}
You check to make sure that i is within bounds for mostOccur but not count. I would add a condition to check to make sure it is in bounds. Such as:
for (int i = 0; i < mostOccur.size() && i < count.size(); i++) {
System.out.println("Word: " + mostOccur.get(i) + " count: " + count.get(i));
}
Here I read the dataset and extracted the data lines(not the attributes) and print it.Next I need to sort the dataset.Now this is stored in an ArrayList.How to sort it?
public static void main(String args[]) throws Exception
{
String filen, jsnfl;
Customiseddata data = new Customiseddata();
data.setAlgorithm("C4.5");
data.setUserName("Dahlia");
System.out.println("Enter the file name");
sc = new Scanner(System.in);
filen = sc.nextLine();
data.setFileName("input_files/" + filen);
Mainclass main = new Mainclass();
main.build(data);
}
public void build(Customiseddata data) throws Exception
{
int extension;
String filename;
filename = data.getFileName();
extension = filename.lastIndexOf('.');
String extensionType = filename.substring(extension + 1,
filename.length());
if (extensionType.equalsIgnoreCase("csv"))
{
readcsv(filename);
}
else if (extensionType.equalsIgnoreCase("arff"))
{
readarff(filename);
}
}
public void readarff(String filename) throws Exception
{
#SuppressWarnings("unused")
int filesize, attributesize, c = 0, i;
#SuppressWarnings("unused")
float v = 0;
String s, line1;
ArrayList<String> filelines;
ArrayList<String> attributes;
Customiseddata data = new Customiseddata();
Arfffilereader arfffile = new Arfffilereader();
Extractdata exdata = new Extractdata();
exdata = arfffile.extractInputArff(filename);
filelines = exdata.getFileLines();
attributes = exdata.getAttributes();
filesize = filelines.size();
attributesize = attributes.size();
data.setFilesize(filesize);
System.out.println("Print the attributes");
System.out.println("--------------------");
for (i = 0; i < attributesize; i++)
{
System.out.println(attributes.get(i));
}
System.out.println("\t");
System.out.println("Print the filelines");
System.out.println("--------------------");
for (int j = 0; j < filesize; j++)
{
System.out.println(filelines.get(j));
}
}
But after this I need to sort the dataset.
Since the elements of the list are Strings and since String implements Comparable, sorting a list is as simple as:
Collections.sort(theList);
Note however that it will sort the list in place. If you don't want that, make a copy of the list and sort that copy.
Good day!
I am making a mini bookstore program and we are required to read a file based from what the customer buys on the specified counter as follows:
counter 4,book1 2,book2 2,book3 2,tender 100.00
counter 1,book1 2,book2 1,book3 3, book4 5,tender 200.00
counter 1,book3 1,tender 50.00
In short the format is:
COUNTER -> ITEMS BOUGHT -> TENDER
I tried doing this but it is not that efficient:
public List<String> getOrder(int i) {
List <String> tempQty = new ArrayList<String>();
String[] orders = orderList.get(0).split(",");
for (String order : orders) {
String[] fields = order.split(" ");
tempQty.add(fields[i]);
}
return tempQty;
}
How can i read the file and at the same time, ensures that I will put it on the correct array? Besides the counter and the tender, I need to know the name of the book and the qty so I could get its price and computer for the total price. Do I need to do multiple arrays to store each values? Any suggestions/ codes will be
highly appreciated.
Thank you.
Map<String, Integer> itemsBought = new HashMap<String, Integer>();
final String COUNTER = "counter";
final String TENDER = "tender";
String[] splitted = s.split(",");
for (String str : splitted) {
str = str.trim();
if (str.startsWith(COUNTER)) {
//do what you want with counter
} else if (str.startsWith(TENDER)) {
//do what you want with tender
} else {
//process items, e.g:
String[] itemInfo = str.split(" ");
itemsBought.put(itemInfo[0], Integer.valueOf(itemInfo[1]));
}
}
How about this? Here we have a class that is modeling a purchase, containing counter, tender and a list of the bought items. The bought item consists of an id (e.g. book1) and a quantity. Use the method readPurchases() to read the contents of a file and get a list of purchases.
Does this solve your problem?
public class Purchase {
private final int counter;
private final List<BoughtItem> boughtItems;
private final double tender;
public Purchase(int counter, List<BoughtItem> boughtItems, double tender) {
this.counter = counter;
this.boughtItems = new ArrayList<BoughtItem>(boughtItems);
this.tender = tender;
}
public int getCounter() {
return counter;
}
public List<BoughtItem> getBoughtItems() {
return boughtItems;
}
public double getTender() {
return tender;
}
}
public class BoughtItem {
private final String id;
private final int quantity;
public BoughtItem(String id, int quantity) {
this.id = id;
this.quantity = quantity;
}
public String getId() {
return id;
}
public int getQuantity() {
return quantity;
}
}
public class Bookstore {
/**
* Reads purchases from the given file.
*
* #param file The file to read from, never <code>null</code>.
* #return A list of all purchases in the file. If there are no
* purchases in the file, i.e. the file is empty, an empty list
* is returned
* #throws IOException If the file cannot be read or does not contain
* correct data.
*/
public List<Purchase> readPurchases(File file) throws IOException {
List<Purchase> purchases = new ArrayList<Purchase>();
BufferedReader lines = new BufferedReader(new FileReader(file));
String line;
for (int lineNum = 0; (line = lines.readLine()) != null; lineNum++) {
String[] fields = line.split(",");
if (fields.length < 2) {
throw new IOException("Line " + lineNum + " of file " + file + " has wrong number of fields");
}
// Read counter field
int counter;
try {
String counterField = fields[0];
counter = Integer.parseInt(counterField.substring(counterField.indexOf(' ') + 1));
} catch (Exception ex) {
throw new IOException("Counter field on line " + lineNum + " of file " + file + " corrupt");
}
// Read tender field
double tender;
try {
String tenderField = fields[fields.length - 1];
tender = Double.parseDouble(tenderField.substring(tenderField.indexOf(' ') + 1));
} catch (Exception ex) {
throw new IOException("Tender field on line " + lineNum + " of file " + file + " corrupt");
}
// Read bought items
List<BoughtItem> boughtItems = new ArrayList<BoughtItem>();
for (int i = 1; i < fields.length - 1; i++) {
String id;
int quantity;
try {
String bookField = fields[i];
id = bookField.substring(0, bookField.indexOf(' '));
quantity = Integer.parseInt(bookField.substring(bookField.indexOf(' ') + 1));
BoughtItem boughtItem = new BoughtItem(id, quantity);
boughtItems.add(boughtItem);
} catch (Exception ex) {
throw new IOException("Cannot read items from line " + lineNum + " of file " + file);
}
}
// We're done with this line!
Purchase purchase = new Purchase(counter, boughtItems, tender);
purchases.add(purchase);
}
return purchases;
}
}