In classroom we made this class that sorts doubles and arranges them from min. to max. I'm interested in changing this class to read from a text file with names and sort them alphabetically instead of doubles that it reads from a numbers text file.
package versionDouble;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;
public class Datos {
double[] datos;
public Datos(String fileString) {
int cuantos = contarDatos( fileString );
this.datos = new double[ cuantos ];
leerDatos( fileString );
} // Datos
private void leerDatos(String fileString) {
try {
Scanner scanner = new Scanner(new File(fileString));
for (int i = 0; i < this.datos.length; i++) {
this.datos[i] = scanner.nextDouble();
} // for
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} // leerDatos
} // Datos class
@Override
public String toString() {
String string = "";
string = Arrays.toString( this.datos );
return string;
} // toString
private int contarDatos(String fileString) {
int contador = 0;
try {
Scanner scanner = new Scanner( new File(fileString));
while ( scanner.hasNext() ) {
scanner.nextDouble();
contador++;
} // while
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} // catch
return contador;
} // contarDatos
public void selectionSort() {
for (int startScan = 0; startScan < this.datos.length; startScan++) {
int minIndex = startScan;
double minValue = this.datos[ minIndex ];
for (int index = 0; index < this.datos.length; index++) {
if( this.datos[ index ] < minValue) {
minIndex = index;
minValue = this.datos[ index ];
} // if
} // for interno
if( minIndex != startScan ) {
double temporary = this.datos[startScan];
this.datos[ startScan ] = this.datos[ minIndex ];
this.datos [ minIndex ] = temporary;
} // swap
} // for externo
Arrays.sort( this.datos );
} // selectionSort
} // Class
You will need to call a different member function on Scanner, for example next() or nextLine(). Also, change the data type of several variables to store strings instead of floating-point numbers. Also you will have to find a way to compare the string alphabetically instead of numerically.