Why isn't my Java program reading a file correctly?

Question

import java.io.*;
import java.util.Scanner;
import java.io.IOException;

public class MorseCodeTester
{
public static void main(String [] args)throws IOException
{
File file = new File("MorseCodeList.txt");
Scanner inFile = new Scanner(file);
String [] morseCode = new String[36];
String [] letters = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r",
"s", "t", "u", "v", "w", "x", "y", "z",
"1", "2", "3", "4", "5", "6", "7", "8", "9", "0", " "};
int x = 0;
while(inFile.hasNextLine())
{
morseCode[x] = inFile.nextLine();
x++;
}

for(int i = 0; i < morseCode.length; i++)
{
System.out.println(morseCode[i]);
}


Scanner userInput = new Scanner(System.in);
int i = 0;
System.out.println("Please enter input with no punctuation");
String userString = userInput.nextLine();
System.out.println("");
MorseCode.convert(userString, morseCode, letters);
}

}


import java.util.Arrays;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
public class MorseCode
{
public MorseCode()
{
}

public static void convert (String toEncode, String [] letters, String [] morseCode)
{
String morse = toEncode;
int len = morse.length();
String [] convertedText = new String[len];
for(int y = 0; y < len; y++)
{
convertedText[y] = (morse.substring(y,y+1));
}
String [] morseCodeText = new String[len];
for(int i = 0; i < convertedText.length; i++)
{
for(int x = 0; x < 36; x++)
{
if(convertedText[i].equals (letters[x]))
{
morseCodeText[i] = morseCode[x];
}
else
{
x++;
}
}
i++;
}

for(int z = 0; z < morseCodeText.length; z++)
{
System.out.print(morseCodeText[z]);
}
}
}



The program is translating English to morse code. I am only printing the entire text file because I wanted to test it.

This is what the output looks like:
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
null
Please enter input with no punctuation
hello

nullnullnullnullnull




This is the text file:
.-
-…
-.-.
-..
.
..-.
—.
….
..
.—
-.-
.-..
--
-.
——
.—-.
—-.-
.-.
...
-
..-
...-
.—-
-..-
-.--
--..
.----
..---
...--
....-
.....
-....
--...
---..
----.
-----
(these are in order from a-z, followed by 0-9)

Answer 1

1

Answer 2

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Answer 3

It looks like it's not reading the morse code text file correctly. The first thing I would do is add an extra debug statement in your reading loop:



int x = 0;

while(inFile.hasNextLine())

{

morseCode[x] = inFile.nextLine();

System.out.println ("x=" + x + " Morse: " + morseCode[x]);

x++;

}



This way you'll see if it's reading the file.



BTW, I've had problems with file specs like this: new File("MorseCodeList.txt");



I've found it's best to write the whole file spec, starting from the top level folder:

C:\\folder\\folder\\ .... \\ MorseCodeList.txt



Note that \ is a special char in Java strings, so you need to double them up.

Answer 4

Well

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