I am trying to run the below code, but error occurs,The filename I mentioned is present on the given path.
public class DataDriventc {
public static void main(String []args) throws BiffException, IOException{
File f = new File("C:/Users/Avnish/Desktop/Input.xlsx");
Workbook w = Workbook.getWorkbook(f);
Sheet s = w.getSheet("Sheet1");
int columns = s.getColumns();
int rows = s.getRows();
System.out.println(columns + "," + rows);
}
}
Try this:
File f = new File("C:\\Users\\Avnish\\Desktop\\Input.xlsx");
For reference, see this question.
Related
I am new in using TPL in .Net applications. While creating a simple console application to achieve some parallel tasks those are dynamically created, I am stuck with some issues.
Problem here is that when 10 tasks are created and run, although the console is showing all the 10 tasks, when writing those into a log file after putting a delay between consoling and logging, the log file misses some of the items randomly.
Below is my sample code (This is just a skeleton of my actual code)
class Program
{
public static int datacount = 10;
static void Main(string[] args)
{
List<Task> tasks = new List<Task>();
var s1 = DateTime.Now;
var transList = GenerateTransactionList();
foreach (var transaction in transList)
{
Transactions transactionNew = new Transactions();
transactionNew = transaction;
tasks.Add(Task.Factory.StartNew(() => serialMethod(transactionNew)));
}
Task.WhenAll(tasks).Wait();
Console.WriteLine("Completed!!!");
}
private static List<Transactions> GenerateTransactionList()
{
Random r = new Random();
List<Transactions> transactionList = new List<Transactions>();
for (int i = 1; i <= datacount; ++i)
{
Transactions tr = new Transactions();
tr.ID = 0;
tr.Amount = r.Next(1, 10);
tr.Created_By = "Iteration" + i;
tr.Notes = "Iteration" + i;
tr.Created_On = DateTime.Now;
transactionList.Add(tr);
}
return transactionList;
}
private static async Task<string> serialMethod(Transactions tlist)
{
Console.WriteLine("Started Serial Iteration" + tlist.Notes);
try
{
Console.WriteLine("Finished Serial Iteration" + tlist.Notes);
Thread.Sleep(10000);//doing some time consuming process
WriteLog("Parallel2", DateTime.Now, DateTime.Now, tlist.Notes);
return "Success";
}
catch (Exception ex)
{
Console.WriteLine("serialmethod" + ex.Message);
return "Failure";
}
}
public static void WriteLog(string type,
DateTime startTime, DateTime endTime,
string dataSet)
{
try
{
string logFolderPath = AppDomain.CurrentDomain.BaseDirectory + #"\Logs";
if (!Directory.Exists(logFolderPath))
Directory.CreateDirectory(logFolderPath);
string logFilePath = logFolderPath + #"\Log_" + DateTime.Today.ToString("yyyy.MM.dd") + ".csv";
string line = string.Empty;
if (!File.Exists(logFilePath))
{
line = #"""Type"",""Start Time"",""End Time"",""Duration"",""Iteration""";
writeLineToFile(logFilePath, line);
}
string duration = (endTime - startTime).ToString();
line = "\"" + type + "\"," +
"\"" + startTime.ToString("MM/dd/yyyy hh:mm:ss tt") + "\"," +
"\"" + endTime.ToString("MM/dd/yyyy hh:mm:ss tt") + "\"," +
"\"" + duration + "\"," +
"\"" + dataSet + "\"";
writeLineToFile(logFilePath, line);
}
catch (Exception)
{
//do nothing
}
}
private static void writeLineToFile(string fileName, string line)
{
using (var writer = new StreamWriter(fileName, true))
{
writer.WriteLine(line);
}
}
}
class Transactions
{
public int ID { get; set; }
public decimal Amount { get; set; }
public int Points { get; set; }
public string Notes { get; set; }
public string Created_By { get; set; }
public DateTime Created_On { get; set; }
}
Do you have any idea why this is happening. I have tried using ConcurrentBag instead of list. But that too is not helping. Please guide and let me know if I am missing anything or my implementation is completely wrong.
There a re a bunch of error-prone lines in your code:
You're overriding the reference for transaction in your foreach loop
You're using StartNew method instead of Tas.Run
You're using blocking WaitAll instead of await WhenAll, so you do block one thread in your application for no reason
You can simply switch to Parallel.Foreach instead of foreach
And most important: you're writing to the same file from different threads simultaneously, so they are basically interrupting each other. Either use some blocking to write the file (which cannot be done in parallel) or use some library for logging, like NLog or whatever, so it will handle logging for you
Your threads can run into situation when some of them trying to create file when other already done that, so move out the creation logic for file into one place (which the libraries like NLog will do for you properly)
Try to use object initializers instead of setting one property after another:
var tr = new Transactions
{
ID = 0,
Amount = r.Next(1, 10),
Created_By = "Iteration" + i,
Notes = "Iteration" + i,
Created_On = DateTime.Now
}
I want to use the class IpAddress instead of String in my List, like this:
ArrayList<IpAddress> IpAddresses = new ArrayList<>();
But it doesn't work. I cannot add the string line to my list, so the program does not work as I want. What should I do?
public class IpAddress implements Comparable<IpAddress> {
private String ip;
public IpAddress(String ip) {
this.ip = ip;
}
#Override
public int compareTo(IpAddress o) {
return this.ip.compareTo(o.ip);
}
}
public class IPvLIST {
public static void main(String[] args) throws IOException {
FileReader fr = new FileReader(new File("ip.txt"));
BufferedReader br = new BufferedReader(fr);
ArrayList<String> IpAddresses = new ArrayList<>();
String line;
int n = 0;
while ((line = br.readLine()) != null) {
IpAddresses.add(line);
}
}
}
You need to convert the string line to an IpAddress. Based on the code you have, change the while statement to
while ((line = br.readLine()) != null) {
IpAddresses.add(new IpAddress(line));
}
Depending if this is a simple test program or something more, you might also look into the .NET class IPAddress. This has a parse function that will take the string and convert it to an IPAddress which makes it easier to perform actual network functions.
I'm writing a program but I'm unable to call a few of the methods I made. The errors are as follows:
-method reportMenu(String) in the type CommissionReportSystem is not applicable for the arguments ()
-Cannot make a static reference to the non-static method getSalesData() from the type CommissionReportSystem
-The method computeTotalSales() is undefined for the type CommissionReportSystem
-The method computeSalesCommission(double) in the type CommissionReportSystem is not applicable for the arguments ()
-The method showAgentCommission(double) in the type CommissionReportSystem is not applicable for the arguments ()
I've tried a lot of fixes but nothing seems to be sticking and I'm unsure of how to proceed. I've included the relevant parts of the code below. I would appreciate any tips on how to fix any of these. Thank you!
import java.io.*;
import java.text.*;
import java.util.*;
public class CommissionReportSystem {
private static final String String = null;
public static void main(String[] args) {
getSalesData ();
computeTotalSales ();
computeSalesCommission ();
showAgentCommission ();
shutdown ();
}
String [] getSalesData (){
String [] data = new String [2];
String ticketsSold = "";
String ticketPrice = "";
String buffer = new String ();
data[0] = buffer;
data[1] = buffer;
BufferedReader br = null;
try {
br = new BufferedReader (new InputStreamReader(System.in));
System.out.print ("Enter tickets sold:");
buffer = br.readLine ();
ticketsSold = buffer;
System.out.print ("Enter ticket price:");
buffer = br.readLine ();
ticketPrice = buffer;
} catch (Exception e) {
System.out.println ("Invalid entry");
}
data [0] = ticketsSold;
data [1] = ticketPrice;
return data;
}
public static double totalSales (String ticketsSold, String ticketPrice){
int ticketsSoldNum = Integer.parseInt(ticketsSold);
double ticketPriceNum = Double.parseDouble(ticketPrice);
double totalSalesNum = ticketsSoldNum * ticketPriceNum;
return totalSalesNum;}
public static final double computeSalesCommission (double totalSalesNum){
final double rate1 = 0.025;
final double rate2 = 0.0375;
final double rate3 = 0.0425;
final double salesLimit1 = 2000;
final double salesLimit2 = 4000;
final double agentCommission= 0;
if (totalSalesNum <= 2000) {
agentCommission = rate1 * totalSalesNum;
}
else if (totalSalesNum <= 4000){
agentCommission = rate2 * totalSalesNum;
}
else (totalSalesNum > 4000){
agentCommission = rate3 * totalSalesNum;
}
return agentCommission;
}
public static void showAgentCommission (double agentCommission){
System.out.format ("Congratulation agent Cindy Smith, your current daily commission:" + agentCommission);
}
public static void shutdown (){
System.out.format ("Thank you for your time! Have a great day!");
}
public static void handleInvalidData (){
}
}
1) getSalesData() is an instance method. If you want to call an instance method, create an object of the class and call method using that. Else you have to make the method static. Remember one the thing you cannot access the instance variables inside static method.
2) There is no method computeTotalSales() in your class.
3) computeSalesCommission() requires an argument of type double. You have called it without any argument.
4) The last comment is also valid for showAgentCommission().
I am trying to input a file that contains the first and last names of several individuals from a file into a java program. I have a People class that has two Strings for the first and last names, as well as, accessors and mutators to access the information. Inside my main method, I have a while loop that brings in each person line by line until the end of the file. It is suppose to create a new instance of Person through the constructor for each line and make a copy to the array. When I print out the contents of the array once the while loop is over with, it seems that the array is filled with the information of the last person in the file. However, if I comment out the String[] values = line.split("\t"); and Person child = new Person(values[0], values[1]); lines and use a double dimensional array to hold a copy of all the information in the file, then it works fine. Is there something that I am doing wrong that is preventing me from retaining a copy of all the individual’s names contained in the file in the People array?
public class Person
{
protected static String first;
protected static String last;
private static int id;
public Person(String l, String f)
{
last = l;
first = f;
} // end of constructor
public String getFirst()
{
return first;
} // end of getFirst method
public static String getLast()
{
return last;
} // end of getLast method
public static int getID()
{
return id;
} // end of getLast method
public static void setFirst(String name)
{
first = name;
} // end of setFirst method
public static void setLast(String name)
{
last = name;
} // end of setLast method
public static void setID(int num)
{
id = num;
} // end of setLast method
} // end of Person class
public class Driver
{
public static void main(String arg[])
{
Person[] temp = new Person[10];
try
{
BufferedReader br = new BufferedReader(new FileReader(arg[1]));
String line = null;
int counter = 0;
while ((line = br.readLine()) != null)
{
String[] values = line.split("\t");
Person child = new Person(values[0], values[1]);
temp[counter] = child;
System.out.println("Index " + counter + ": Last: " + child.getLast() + " First: " + child.getFirst());
System.out.println("Index " + counter + ": Last: " + temp[counter].getLast() + " First: " + temp[counter].getFirst() + "\n");
counter++;
}
br.close();
}
catch(Exception e)
{
System.out.println("Could not find file");
}
for(int row = 0; row < 7; row++)
{
System.out.print("Row: " + row + " Last: " + temp[row].getLast() + " First: " + temp[row].getFirst() + "\n");
}
}
} // end of Driver class
The fields in class Person should not be static, a static field means shares the value for all instances of the class, that means all the 10 instances Person have the same "first", "last" and "id" values. And you need to change the methods of Person to non-static too, since static method cannot access static fields.
What I need to achieve is to import data from a text file that contains two columns of doubles as follows:
201.0176 1.06E+03
201.7557 1.11E+01
202.0201 2.02E+02
202.2064 9.76E+00
202.8342 1.11E+01
203.0161 2.02E+02
203.1638 9.61E+00
203.3843 1.13E+01
There are up to about 50,000 lines of these data. I want each column to be imported into a separate array but I cannot work out how to identify between the separate columns. I have tried the following:
public class CodeTests {
public static ArrayList assignArray(String filePath) throws FileNotFoundException {
Scanner s = new Scanner(new File(filePath));
ArrayList<Double> list = new ArrayList<Double>();
while (s.hasNext()){
list.add(s.nextDouble());
}
s.close();
return list;
}
public static void main(String[] args) throws IOException {
/*
*
*/
ArrayList arrayMZ;
arrayMZ = assignArray("F:/Stuff/Work/Work from GSK/From Leeds/ja_CIDFragmenter/testFile.txt");
for(int i = 0; i < arrayMZ.size(); i++)
System.out.println(arrayMZ.get(i));
System.out.println("End");
}
}
From running this I get the output:
run:
201.0176
1060.0
201.7557
11.1
202.0201
202.0
202.2064
9.76
202.8342
11.1
203.0161
202.0
203.1638
9.61
203.3843
11.3
End
BUILD SUCCESSFUL (total time: 1 second)
Can anyone help me either separate these columns into two arrays or even into a single 2D array under the columns of array[0] with the first data column in it and array[1] with the second. i.e. :
[0] [1]
201.0176 1.06E+03
201.7557 1.11E+01
202.0201 2.02E+02
202.2064 9.76E+00
202.8342 1.11E+01
203.0161 2.02E+02
203.1638 9.61E+00
203.3843 1.13E+01
I've tried to make this as clear as I can but if there is anything else please let me know.
Thanks
You could do something like this:
public static ArrayList[] assignArray(String filePath) throws FileNotFoundException {
Scanner s = new Scanner(new File(filePath));
ArrayList[] list = new ArrayList[2];
ArrayList<Double> col1 = new ArrayList<Double>();
ArrayList<Double> col2 = new ArrayList<Double>();
while (s.hasNext()){
String[] data = s.nextLine().split("\\s+");
col1.add(Double.parseDouble(data[0]));
col2.add(Double.parseDouble(data[1]));
}
s.close();
list[0] = col1;
list[1] = col2;
return list;
}
and obtain an array of two ArrayList with your data.
Something like:
for(int i = 0; i < arrayMZ.size() / 2; i+=2)
System.out.printf("%.4f\t%E\n", arrayMZ.get(i), arrayMZ.get(i + 1));