Answered step-by-stepThe Java Collections Framework Vector vis-à-vis a Conventional...
The Java Collections Framework Vector vis-à-vis a Conventional Array
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Introduction
The Java Collections Framework or JCF provides us with a Vector class which we can utilize to process a single column of data. Of course the Vector class is based upon a mathematical construct also called a vector. One might visualize a vector as a single column in a Microsoft Excel spreadsheet. We might be talking about thousands of entries, one after the other. A common way to store such data is in a relational database such as Microsoft Access or MySQL. When the data are stored in a relation or table in a relational database, it is relatively easy to query the data to obtain various statistical measures. It is also possible to warehouse data in a CSV or comma-separated values file. CSV files offer a mechanism to share data which might be processed in a variety of contexts. The JCF Vector class is applicable when one is tasked with processing large volumes of data. As it turns out, a conventional array is very similar to a Vector object. There is one important distinction. A Vector can grow and shrink as needed. A conventional array is fixed in size once it is declared. Keep in mind an array may be more appropriate in certain contexts rather than a Vector.
Discussion
Thinking back to the CSV file Download CSV fileand the provided Java applicationDownload Java application
import java.util.Vector;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class WeatherVectorApp {
private static Vector<Double> airTemp = new Vector<Double>();
private static File airTempFile = new File("CISC213JCFExercise.csv");
private static Scanner aTFileScanner;
public static void main(String[] args) throws FileNotFoundException {
aTFileScanner = new Scanner(airTempFile);
readFile();
airTempStats();
aTFileScanner.close();
}
private static void readFile() {
System.out.println("Size of airTemp Vector before load: "
+ airTemp.size());
while(aTFileScanner.hasNext()) {
airTemp.addElement(aTFileScanner.nextDouble());
}
System.out.printf("Size of airTemp Vector after load: %,d\n",
airTemp.size());
}
private static void airTempStats() {
double read = airTemp.get(0);
double max = read;
double total = read;
double min = read;
for(int i = 1; i < airTemp.size(); i++) {
read = airTemp.get(i);
if(read < min) min = read;
if(read > max) max = read;
total += read;
}
System.out.println("Minimum air temperature in Celsius: " +
min);
System.out.println("Maximum air temperature in Celsius: " +
max);
System.out.printf("Average air temperature in Celsius: %.2f\n",
total/airTemp.size());
}
}
to process the CSV file, why is it advantageous to place a reliance upon the Vector class instead of a conventional array of doubles? Consider the fact that Vectors can grow and shrink as needed, while once memory is allocated for an array, its size cannot change. Bear in mind we do not know how many temperature readings there are in the CSV file.
References
Official documentation on the Vector class, published by OracleLinks to an external site.
Official documentation on conventional arrays, published by Oracle
Answer & Explanation
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