Re: Java Delemma
- From: Alex Hall <mehgcap@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Wed, 30 Jun 2010 22:16:47 -0400
Glad to hear it. Jamal is right; there is nothing quite like the
feeling when your program compiles, then it runs, then you get exactly
what you wanted!
On 6/30/10, Jamal Mazrui <empower@xxxxxxxxx> wrote:
> Congratulations -- it's a great feeling to have produced a working
> program that is elegantly written!
>
> Jamal
>
> On 6/30/2010 8:35 PM, Gilbert Neiva wrote:
>> Guess what alex and everyone else. I finally got my application to work
>> right. I checked the History.d2 file after my millionth atempt at making
>> my source code just right, and the paragraphs are indented properly,
>> there are no extra blank lines anywhere, and only the beginnings of
>> paragraphs are indented. The bodies of paragraphs are properly
>> formatted. My new source code is below.
>>
>> import java.io.*; // importing input.output classes
>> import java.util.Scanner;
>>
>> public class History
>> {
>> static Scanner inFile; // Object that will read from file
>> static PrintWriter outFile; // object that will print to file
>>
>> static void printHistory() throws IOException
>> // Start of void method
>> {
>> String inputString; // String for line of text in file
>> final String blanks = " ";
>> // Five blanks inserted at beginning of paragraphs
>> inFile = new Scanner(new FileReader("history.d1"));
>> // Instantiating new scanner and new filereader object with
>> // history.d1 as argument
>> outFile = new PrintWriter(new FileWriter("history.d2"));
>> // Instantiating new printWriter object
>> // It will be used to write to a file
>> inputString = blanks+inFile.nextLine();
>> outFile.println(inputString);
>> // Printing 5 spaces plus line
>> // to file
>>
>> while (inFile.hasNextLine())
>> {
>> inputString = inFile.nextLine();
>>
>> if (inputString.length() < 1)
>> {
>> inputString = inFile.nextLine();
>> if (inputString.length() < 1)
>> {
>> inputString = inFile.nextLine();
>> outFile.println("\n");
>> inputString = blanks+inputString;
>> outFile.println(inputString);
>> }
>> else
>> {
>> outFile.println("\n");
>> inputString = blanks+inputString;
>> outFile.println(inputString);
>> }
>> }
>> else
>> {
>> outFile.println(inputString);
>> // Printing line of text to file
>> }
>> }
>> inFile.close();
>> outFile.close();
>> // Closing files
>> }
>>
>> public static void main(String[] args) throws IOException
>> {
>> printHistory();
>> // Calling method printHistory()
>> }
>> } // End of class
>>
>> Gilbert Neiva
>>
>> ----- Original Message ----- From: "Alex Hall" <mehgcap@xxxxxxxxx>
>> To: <programmingblind@xxxxxxxxxxxxx>
>> Sent: Tuesday, June 29, 2010 7:26 AM
>> Subject: Re: Java Delemma
>>
>>
>>> I saw that that would happen when I read the program; I assumed that
>>> you wanted that to happen. The problem is that you insert blanks for
>>> every itteration of the loop that has a line whose length is greater
>>> than 0. You must implement a checker to see if the previous line was
>>> of length 0. I will leave the details up to you, as this is a great
>>> exercise, but consider recording the previous line's length in an int
>>> and checking that...
>>>
>>> On 6/29/10, Stanzel, Susan - Kansas City, MO
>>> <susan.stanzel@xxxxxxxxxxxx> wrote:
>>>> Hi Listers,
>>>>
>>>> Please don't forget about the java list at
>>>> program-java@xxxxxxxxxxxxxx There
>>>> are many great folks on that list.
>>>>
>>>> Susie Stanzel
>>>>
>>>> -----Original Message-----
>>>> From: programmingblind-bounce@xxxxxxxxxxxxx
>>>> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Gilbert
>>>> Neiva
>>>> Sent: Tuesday, June 29, 2010 7:01 AM
>>>> To: programmingblind@xxxxxxxxxxxxx
>>>> Subject: Re: Java Delemma
>>>>
>>>> Hey Alex. It seems I spoke to soon. It seems that when I checked the
>>>> history.d2 file a little more closely, I found that every single line
>>>> was
>>>> indented, not just the beginning of paragraphs. The history.d1 was
>>>> written
>>>> wwith every line written fresh, that is to say, one line was written and
>>>> then the author pushed enter and wrote another line and so on. Is
>>>> there a
>>>> way to correct for this so that just the beginning of paragraphs are
>>>> indented and not everything else?
>>>>
>>>> Gilbert Neiva
>>>>
>>>> ----- Original Message -----
>>>> From: "Alex Hall" <mehgcap@xxxxxxxxx>
>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>> Sent: Monday, June 28, 2010 9:42 PM
>>>> Subject: Re: Java Delemma
>>>>
>>>>
>>>>> Glad it worked, or mostly worked. I am not sure why you would get two
>>>>> lines right before the final paragraph...
>>>>>
>>>>> On 6/28/10, Gilbert Neiva <gneiva@xxxxxxx> wrote:
>>>>>> Hi Alex. I just found out that the output file doesn't need two lines
>>>>>> above
>>>>>> the last paragraph. As a result I made the following if and else if
>>>>>> statements.
>>>>>>
>>>>>> if (inputString.length() < 1)
>>>>>> {
>>>>>> outFile.print("\n");
>>>>>> }
>>>>>> else if (inputString.length() > 0)
>>>>>> {
>>>>>> inputString = blanks+inputString;
>>>>>> }
>>>>>>
>>>>>> When I checked the outfile.d2 file, the last paragraph still had two
>>>>>> lines
>>>>>> above it, but at least the last paragraph was properly indented.
>>>>>> Here is
>>>>>> my
>>>>>> new class.
>>>>>>
>>>>>> import java.io.*; // importing input.output classes
>>>>>> import java.util.Scanner;
>>>>>>
>>>>>> public class History
>>>>>> {
>>>>>> static Scanner inFile; // Object that will read from file
>>>>>> static PrintWriter outFile; // object that will print to file
>>>>>>
>>>>>> static void printHistory() throws IOException
>>>>>> // Start of void method
>>>>>> {
>>>>>> String inputString; // String for line of text in file
>>>>>> final String blanks = " ";
>>>>>> // Five blanks inserted at beginning of paragraphs
>>>>>> inFile = new Scanner(new FileReader("history.d1"));
>>>>>> // Instantiating new scanner and new filereader object with
>>>>>> // history.d1 as argument
>>>>>> outFile = new PrintWriter(new FileWriter("history.d2"));
>>>>>> // Instantiating new printWriter object
>>>>>> // It will be used to write to a file
>>>>>> inputString = blanks+inFile.nextLine();
>>>>>> outFile.println(inputString);
>>>>>> // Printing 5 spaces plus line
>>>>>> // to file
>>>>>>
>>>>>> while (inFile.hasNextLine())
>>>>>> {
>>>>>> inputString = inFile.nextLine();
>>>>>>
>>>>>> if (inputString.length() < 1)
>>>>>> {
>>>>>> outFile.print("\n");
>>>>>> }
>>>>>> else if (inputString.length() > 0)
>>>>>> {
>>>>>> inputString = blanks+inputString;
>>>>>> }
>>>>>> outFile.println(inputString);
>>>>>> // Printing line of text to file
>>>>>> }
>>>>>> inFile.close();
>>>>>> outFile.close();
>>>>>> // Closing files
>>>>>> }
>>>>>>
>>>>>> public static void main(String[] args) throws IOException
>>>>>> {
>>>>>> printHistory();
>>>>>> // Calling method printHistory()
>>>>>> }
>>>>>> } // End of class
>>>>>>
>>>>>> Gilbert Neiva
>>>>>>
>>>>>> ----- Original Message -----
>>>>>> From: "Alex Hall" <mehgcap@xxxxxxxxx>
>>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>>> Sent: Monday, June 28, 2010 8:30 PM
>>>>>> Subject: Re: Java Delemma
>>>>>>
>>>>>>
>>>>>> And the problem is that the final paragraph does not get the indent...
>>>>>> What if you changed the if statement to something like this:
>>>>>> if (inputString.length() < 1)
>>>>>> {
>>>>>> outFile.println("\n");
>>>>>> inputString = blanks+inputString;
>>>>>> }
>>>>>>
>>>>>> I say this because, and I could be wrong here, each call to a file
>>>>>> object's nextLine() method moves you down a line in the file, as
>>>>>> though you had pressed the down arrow (assuming the arrows moved you
>>>>>> by full lines, not just as many words as are on one line of a
>>>>>> monitor). When you assign inputString to inFile.nextLine(), you press
>>>>>> this hypothetical down arrow. Then, when you assign inputString to
>>>>>> blanks+inFile.nextLine(), you are pressing the arrow again, so the
>>>>>> line may not be correct. I am not sure if that will do it, but it is
>>>>>> the only thing I see. Someone on the list will likely be able to
>>>>>> direct you better.
>>>>>>
>>>>>>
>>>>>> On 6/28/10, Gilbert Neiva <gneiva@xxxxxxx> wrote:
>>>>>>> Here is the entire class.
>>>>>>>
>>>>>>> import java.io.*; // importing input.output classes
>>>>>>> import java.util.Scanner;
>>>>>>>
>>>>>>> public class History
>>>>>>> {
>>>>>>> static Scanner inFile; // Object that will read from file
>>>>>>> static PrintWriter outFile; // object that will print to file
>>>>>>>
>>>>>>> static void printHistory() throws IOException
>>>>>>> // Start of void method
>>>>>>> {
>>>>>>> String inputString; // String for line of text in file
>>>>>>> final String blanks = " ";
>>>>>>> // Five blanks inserted at beginning of paragraphs
>>>>>>> inFile = new Scanner(new FileReader("history.d1"));
>>>>>>> // Instantiating new scanner and new filereader object with
>>>>>>> // history.d1 as argument
>>>>>>> outFile = new PrintWriter(new FileWriter("history.d2"));
>>>>>>> // Instantiating new printWriter object
>>>>>>> // It will be used to write to a file
>>>>>>> inputString = blanks+inFile.nextLine();
>>>>>>> outFile.println(inputString);
>>>>>>> // Printing 5 spaces plus line
>>>>>>> // to file
>>>>>>>
>>>>>>> while (inFile.hasNextLine())
>>>>>>> {
>>>>>>> inputString = inFile.nextLine();
>>>>>>>
>>>>>>> if (inputString.length() < 1)
>>>>>>> {
>>>>>>> outFile.println("\n");
>>>>>>> inputString = blanks+inFile.nextLine();
>>>>>>> }
>>>>>>> outFile.println(inputString);
>>>>>>> // Printing line of text to file
>>>>>>> }
>>>>>>> inFile.close();
>>>>>>> outFile.close();
>>>>>>> // Closing files
>>>>>>> }
>>>>>>>
>>>>>>> public static void main(String[] args) throws IOException
>>>>>>> {
>>>>>>> printHistory();
>>>>>>> // Calling method printHistory()
>>>>>>> }
>>>>>>> } // End of class
>>>>>>>
>>>>>>> Gilbert Neiva
>>>>>>>
>>>>>>> ----- Original Message -----
>>>>>>> From: "Alex Hall" <mehgcap@xxxxxxxxx>
>>>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>>>> Sent: Monday, June 28, 2010 6:58 PM
>>>>>>> Subject: Re: Java Delemma
>>>>>>>
>>>>>>>
>>>>>>>> I don't follow. Could you post the entire loop so we can see what is
>>>>>>>> going on? Also, comments are welcomed! Remember that in Java, two
>>>>>>>> slashes mean that the rest of the line is a comment, so you could
>>>>>>>> put
>>>>>>>> this in your file:
>>>>>>>> if(1a==0){ //check that a is really 0
>>>>>>>> System.out.print("var a is 0!"); //tell user
>>>>>>>> }//end if
>>>>>>>>
>>>>>>>> On 6/28/10, Gilbert Neiva <gneiva@xxxxxxx> wrote:
>>>>>>>>> I succeeded in making my application that inputs a file, prints 5
>>>>>>>>> spaces
>>>>>>>>> at
>>>>>>>>> the beginning of a paragraph and prints to a file with the new
>>>>>>>>> changes.
>>>>>>>>> Now
>>>>>>>>> I have another problem. The last paragraph of the input file has
>>>>>>>>> two
>>>>>>>>> blank
>>>>>>>>> lines above it. When my application runs and creates the output
>>>>>>>>> file,
>>>>>>>>> the
>>>>>>>>> last paragraph of the output file has two lines above it, but the
>>>>>>>>> paragraph
>>>>>>>>> is not indented. The blank line just above the paragraph has 5
>>>>>>>>> space
>>>>>>>>> characters in it. The rest of the output file is fine. The
>>>>>>>>> paragraphs
>>>>>>>>> in
>>>>>>>>> the
>>>>>>>>> output file that have no indent issues have one blank line above
>>>>>>>>> them
>>>>>>>>> which
>>>>>>>>> is what I want. I made an if statement inside a while statement to
>>>>>>>>> detect
>>>>>>>>> the blank lines and print an extra blank line to the output file as
>>>>>>>>> well
>>>>>>>>> as
>>>>>>>>> store the new paragraph indented 5 spaces in a string varriable.
>>>>>>>>> The
>>>>>>>>> if
>>>>>>>>> statement is as follows.
>>>>>>>>>
>>>>>>>>> if inputString.length() < 1
>>>>>>>>> {
>>>>>>>>> outFile.println("\n");
>>>>>>>>> inputString = inFile.nextLine();
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> What do I do to correct my last paragraph so it is indented
>>>>>>>>> properly,
>>>>>>>>> but
>>>>>>>>>
>>>>>>>>> I
>>>>>>>>> still have two blank lines above it?
>>>>>>>>>
>>>>>>>>> Gilbert Neiva
>>>>>>>>>
>>>>>>>>> ----- Original Message -----
>>>>>>>>> From: "Alex Hall" <mehgcap@xxxxxxxxx>
>>>>>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>>>>>> Sent: Monday, June 28, 2010 1:36 PM
>>>>>>>>> Subject: Re: Java Delemma
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> You want to use getNext(), not hasNext(). HasNext is a test to
>>>>>>>>>> see if
>>>>>>>>>> any lines remain; you might say something like
>>>>>>>>>> while(file.hasNextLine()){
>>>>>>>>>> txt+=file.getNextLine();
>>>>>>>>>> }
>>>>>>>>>> Please note that it has been some time since I did Java, so the
>>>>>>>>>> method
>>>>>>>>>> may not be called getNext, but it is something similar which
>>>>>>>>>> you can
>>>>>>>>>> find in the docs.
>>>>>>>>>> The error is because hasNext returns true or false (a boolean)
>>>>>>>>>> where
>>>>>>>>>> getNext returns an actual string, which is what you want.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 6/28/10, Gilbert Neiva <gneiva@xxxxxxx> wrote:
>>>>>>>>>>> I'm trying to write an application which takes an input file, and
>>>>>>>>>>> adds
>>>>>>>>>>> 5
>>>>>>>>>>> blank spaces at the beginning of each paragraph. Then the
>>>>>>>>>>> application
>>>>>>>>>>> is
>>>>>>>>>>> to
>>>>>>>>>>> write to an output file with the new changes. The application
>>>>>>>>>>> will
>>>>>>>>>>> detect
>>>>>>>>>>> the beginning of a new paragraph because there is a blank line
>>>>>>>>>>> before
>>>>>>>>>>> it.
>>>>>>>>>>>
>>>>>>>>>>> I
>>>>>>>>>>> test for the blank using the following if statement.
>>>>>>>>>>>
>>>>>>>>>>> if inputString.length() < 1
>>>>>>>>>>> {
>>>>>>>>>>> inputString = blanks+inFile.hasNextLine();
>>>>>>>>>>> }
>>>>>>>>>>>
>>>>>>>>>>> When I tried to compile the application using the javac
>>>>>>>>>>> program, I
>>>>>>>>>>> get
>>>>>>>>>>> the
>>>>>>>>>>> following error.
>>>>>>>>>>>
>>>>>>>>>>> History.java:23: incompatible types
>>>>>>>>>>> found : boolean
>>>>>>>>>>> required: java.lang.String
>>>>>>>>>>> inputString = inFile.hasNextLine();
>>>>>>>>>>> ^
>>>>>>>>>>> 1 error
>>>>>>>>>>>
>>>>>>>>>>> The source code for the application is below.
>>>>>>>>>>>
>>>>>>>>>>> import java.io.*; // importing input.output classes
>>>>>>>>>>>
>>>>>>>>>>> import java.util.Scanner;
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> public class History
>>>>>>>>>>>
>>>>>>>>>>> {
>>>>>>>>>>>
>>>>>>>>>>> public static Scanner inFile;
>>>>>>>>>>>
>>>>>>>>>>> public static PrintWriter outFile;
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> public static void main(String[] args)
>>>>>>>>>>>
>>>>>>>>>>> {
>>>>>>>>>>>
>>>>>>>>>>> String inputString; // Input string from a line in file
>>>>>>>>>>>
>>>>>>>>>>> final String blanks = " ";
>>>>>>>>>>>
>>>>>>>>>>> // Five blanks inserted at beginning of each paragraph
>>>>>>>>>>>
>>>>>>>>>>> inFile = new Scanner(new FileReader("history.d1"));
>>>>>>>>>>>
>>>>>>>>>>> // Instantiating new scanner and new filereader object with
>>>>>>>>>>>
>>>>>>>>>>> // history.d1 as argument
>>>>>>>>>>>
>>>>>>>>>>> outFile = new PrintWriter(new FileWriter("history.d2"));
>>>>>>>>>>>
>>>>>>>>>>> // Instantiating new printWriter object
>>>>>>>>>>>
>>>>>>>>>>> // It will be used to write to a file
>>>>>>>>>>>
>>>>>>>>>>> inputString = blanks+inFile.hasNextLine();
>>>>>>>>>>>
>>>>>>>>>>> outFile.println(inputString);
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> while (inFile.hasNextLine())
>>>>>>>>>>>
>>>>>>>>>>> {
>>>>>>>>>>>
>>>>>>>>>>> inputString = inFile.hasNextLine();
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> if (inputString.length() < 1)
>>>>>>>>>>>
>>>>>>>>>>> {
>>>>>>>>>>>
>>>>>>>>>>> inputString = blanks+inFile.hasNextLine();
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>>
>>>>>>>>>>> outFile.println(inputString);
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>>
>>>>>>>>>>> inFile.close();
>>>>>>>>>>>
>>>>>>>>>>> outFile.close();
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>>
>>>>>>>>>>> }
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> What am I doing wrong?
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Gilbert Neiva
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Have a great day,
>>>>>>>>>> Alex (msg sent from GMail website)
>>>>>>>>>> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>>>>>>>>>> __________
>>>>>>>>>> View the list's information and change your settings at
>>>>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> __________
>>>>>>>>> View the list's information and change your settings at
>>>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Have a great day,
>>>>>>>> Alex (msg sent from GMail website)
>>>>>>>> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>>>>>>>> __________
>>>>>>>> View the list's information and change your settings at
>>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> __________
>>>>>>> View the list's information and change your settings at
>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Have a great day,
>>>>>> Alex (msg sent from GMail website)
>>>>>> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>>>>>> __________
>>>>>> View the list's information and change your settings at
>>>>>> //www.freelists.org/list/programmingblind
>>>>>>
>>>>>> __________
>>>>>> View the list's information and change your settings at
>>>>>> //www.freelists.org/list/programmingblind
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Have a great day,
>>>>> Alex (msg sent from GMail website)
>>>>> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>>>>> __________
>>>>> View the list's information and change your settings at
>>>>> //www.freelists.org/list/programmingblind
>>>>>
>>>>
>>>> __________
>>>> View the list's information and change your settings at
>>>> //www.freelists.org/list/programmingblind
>>>>
>>>> __________
>>>> View the list's information and change your settings at
>>>> //www.freelists.org/list/programmingblind
>>>>
>>>>
>>>
>>>
>>> --
>>> Have a great day,
>>> Alex (msg sent from GMail website)
>>> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>>> __________
>>> View the list's information and change your settings at
>>> //www.freelists.org/list/programmingblind
>>>
>>>
>>
>> __________
>> View the list's information and change your settings at
>> //www.freelists.org/list/programmingblind
>>
> __________
> View the list's information and change your settings at
> //www.freelists.org/list/programmingblind
>
>
--
Have a great day,
Alex (msg sent from GMail website)
mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
__________
View the list's information and change your settings at
//www.freelists.org/list/programmingblind
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