I Want A Program That Can Store Some Text Files.

Write a program that reads a text file of a specific format, stores fields of each line in an ArrayList (you h?

if you want to use the listed source code, you have to give me credit! otherwise i would block your account.

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Program {
public static void main(String[] args) {
String fileName = "c:/temp/data.txt";
List countries = load(fileName);
for (Country c : countries) {
System.out.println(c);
}
}

private static List load(String fileName) {
List countries = new ArrayList(0);
Scanner fileIn = null;
try {
fileIn = new Scanner(new FileReader(fileName));
while (fileIn.hasNext()) {
String record = fileIn.nextLine();
countries.add(new Country(record));
}
fileIn.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return countries;
}
}

class Country {
private String name;
private String capital;
private long population;

public Country(String record) {
String[] fields = record.split("\\s");
setCapital(fields[0]);
setPopulation(Long.parseLong(fields[1]))...
setName(fields[2]);
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getCapital() {
return capital;
}

public void setCapital(String capital) {
this.capital = capital;
}

public long getPopulation() {
return population;
}

public void setPopulation(long population) {
this.population = population;
}

@Override
public String toString() {
return String.format("%s (%s) %,d", getName(), getCapital(), getPopulation());
}
}

File Input and Output not working in my C++ program?

These are all the lines of code that use the stream fout:

ofstream fout; // output variable
fout.open("C:\\output.txt", ios::app); // program will output updated info here
fout << fixed << showpoint;
fout << setprecision (2);
fout.close();

Do you see a problem here? Which of those lines of code will write something to the file output.txt? None of them, right? If you don't have any lines of code that write output to an output file, then..yes...your output file will be empty when you are done.

Best data structure for storing frequency of words in a text file?

A few search hits tell me that there are fewer than 13,000 distinct English words in the King James Bible, so the quicksort of that list is not likely to be your problem. Make sure your hash table has about twice that many entries at the start if you want to get best performance.

If your hash function is any good, the n log n performance of quicksort is almost guaranteed. The table itself is in randomized order and is incredibly unlikely to have O(n^2) performance.

So, you are already using what I think are the generically best data structures.

If, against all odds, it is the sort that is a bottleneck for you, you can improve the sort-by-frequency by simply using an array of pointers indexed by frequency. Each of those is the head of a linked list of words with exactly that frequency. The average number of collisions should be quite small, with the longest lists of duplicates in the very low frequency range, or so I'd expect. Anything that, against expectations, occurred more often than the table size goes into an "overflow" list.

This is essentially a radix sort, with a very large radix.

With custom code, that should perform pretty well. With an OOP implementation, calling 5000 (or so) constructors to initialize an array of linked list objects is likely to exceed the sort time. (A C/C++ pointer array can be blasted to all zeros in just half that number of memory store cycles, assuming 64 bit memory bus and 32-bit pointers.

Advantages of using a Text File instead of a database file in programming java?

At the moment i'm doing a project for school where I am coding a hotel reservation system and I want to store the information that is entered in a text file. The actual main reason i'm using a text file over a database is, that it is easier to code into the program but I cant exactly put that down in my documentation for the project.

So if anyone could please give me some advantages of using a text file in a java program rather than a database for storing guest information like First Name, Last Name, ID Number, Physical Address etc. PLEASE PLEASE let me know!!