public static int CountTotalDataPointsInFile(String fileName) // length of
// array to be
// filled
{
int numExamples;
int numFeatures;
int predictedValuesCount = 0;
int valuesCount = 0;
TextFileInput tfi = new TextFileInput(fileName);
String line = tfi.readLine();
// create a new scanner with the specified String Object
Scanner scanner = new Scanner(line);
numExamples = scanner.nextInt();
numFeatures = scanner.nextInt();
// close the scanner
scanner.close();
predictedValuesCount = numExamples * numFeatures;
while (line != null) {
line = tfi.readLine();
if (line != null) {
// create a new scanner with the specified String Object
scanner = new Scanner(line);
// use US locale to be able to identify doubles in the string
scanner.useLocale(Locale.US);
// find the next double token and print it
// loop for the whole scanner
while (scanner.hasNext()) {
// if the next is a double, print found and the double
if (scanner.hasNextDouble()) {
System.out.println("Found :" + scanner.nextDouble());
valuesCount++;
}
// if the next is an int, print found and the int
if (scanner.hasNextInt()) {
System.out.println("Found :" + scanner.nextInt() * 1.0);
valuesCount++;
}
}
// close the scanner
scanner.close();
}
}
if (predictedValuesCount != valuesCount) {
System.out.println(
"Error parsing file. Expected: " + predictedValuesCount + ". Parsed: " + valuesCount);
}
return valuesCount;
}
/**
* opens the chosen file, reads in the file, and prints out a receipt
*
* @param chosenFile
*/
private void readSource(File chosenFile) {
String chosenFileName = chosenFile.getName();
TextFileInput inFile = new TextFileInput(chosenFileName);
Container myContentPane = jframe.getContentPane();
// chosenFile TextArea myTextArea = new TextArea();
myContentPane.add(myTextArea);
int count = 0;
float priceTotal = 0.0f;
Database db = new Database("database2.txt");
String[] transaction = new String[100];
String line = inFile.readLine();
DecimalFormat df = new DecimalFormat("#00.00");
while (line != null) {
StringTokenizer tokenized = new StringTokenizer(line, ",");
String code = tokenized.nextToken();
float weight = Float.parseFloat(tokenized.nextToken());
String name;
float price;
try {
name = db.getName(code);
} catch (ItemNotFoundException e) {
name = JOptionPane.showInputDialog(null, "Item " + code + " not found. Enter Name: ");
}
try {
price = db.getPrice(code);
} catch (ItemNotFoundException e) {
price =
Float.valueOf(
JOptionPane.showInputDialog(
null, "Price for " + name + " not found. Enter price: "));
}
float itemTotal = weight * price;
priceTotal += itemTotal;
transaction[count] =
name + "\t" + price + "\t" + df.format(weight) + "\t $" + df.format(itemTotal);
count++;
line = inFile.readLine();
} // while
myTextArea.setText("ITEM: \t PRICE\\LB: \t POUNDS: \t TOTAL:");
myTextArea.append("\n");
for (int i = 0; i < count; i++) {
myTextArea.append(transaction[i]);
myTextArea.append("\n");
}
myTextArea.append("\t\t TOTAL: $" + df.format(priceTotal));
jframe.setVisible(true);
} // openFile
/**
* reads from database file and creates a new fruit or vegetable
*
* @param filename
*/
public void readFromFile(String filename) {
TextFileInput input = new TextFileInput(filename);
String line = input.readLine();
while (line != null) {
StringTokenizer token = new StringTokenizer(line, ",");
String type = token.nextToken();
String code = token.nextToken();
String name = token.nextToken();
float price = Float.parseFloat(token.nextToken());
ProduceItem item;
if (type.equals("F")) {
item = new Fruit(code, name, price);
} else item = new Vegetable(code, name, price);
items.append(item);
line = input.readLine();
} // while
} // readFromFile
public double[] readFile(String fileName, int TotalDataPoints) // Length of
// array to
// be filled
{
double[] alldatapoints = new double[TotalDataPoints];
TextFileInput tfi = new TextFileInput(fileName);
String line = tfi.readLine(); // first line of file
int count = 0;
while (line != null) {
line = tfi.readLine(); // second line of file (given first
// iteration)
if (line != null) {
// create a new scanner with the specified String Object
Scanner scanner = new Scanner(line);
// use US locale to be able to identify doubles in the string
scanner.useLocale(Locale.US);
// find the next double token and print it
// loop for the whole scanner
while (scanner.hasNext()) {
// if the next is a double, add double to data set
if (scanner.hasNextDouble()) {
alldatapoints[count] = scanner.nextDouble() * 1.0;
count++;
}
// if the next is an int, parse to double and add to data
// set
if (scanner.hasNextInt()) {
alldatapoints[count] = scanner.nextInt() * 1.0;
count++;
}
}
// close the scanner
scanner.close();
}
}
System.out.println("Size of data set: " + alldatapoints.length);
return alldatapoints;
} // Read File