Write a program that reads a file a character at a time and prints out how many

Question

Write a program that reads a file a character at a time and prints out how many times the vowels a e i o u occur (in upper- or lowercase).

Complete the following file:

Vowels.java

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class Vowels
{
public static void main(String[] args) throws FileNotFoundException
{
String vowels = "aeiou";
int[] counters = new int[vowels.length()];

Scanner console = new Scanner(System.in);
System.out.print("Input file: ");
String inputFileName = console.next();

. . .

for (int i = 0; i < vowels.length(); i++)
{
System.out.println(vowels.charAt(i) + ": " + counters[i]);
}
}
}

Explanation / Answer

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Scanner;

public class Vowels
{
public static void main(String[] args) throws IOException
{
String vowels = "aeiou";
int[] counters = new int[vowels.length()];

Scanner console = new Scanner(System.in);
System.out.print("Input file: ");
String inputFileName = console.next();

BufferedReader buffer = new BufferedReader(
new InputStreamReader(new FileInputStream(new File(inputFileName))));
int c = 0;
while((c = buffer.read()) != -1) {
char character = Character.toLowerCase((char) c);
switch (character) {
           case 'a':
               counters[0]++;
               break;
           case 'e':
               counters[1]++;
               break;
           case 'i':
               counters[2]++;
               break;
           case 'o':
               counters[3]++;
               break;
           case 'u':
               counters[4]++;
               break;
           default:
               break;
       }
}

for (int i = 0; i < vowels.length(); i++)
{
System.out.println(vowels.charAt(i) + ": " + counters[i]);
}
}
}

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