RE: Java Delemma
- From: "Joseph Lee" <joseph.lee22590@xxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Mon, 28 Jun 2010 19:59:41 -0700
Hi,
Of course - a NULL value would mean invalid data... I guess that would be
the case for Java - in C++, it would be while (!= iifstreamobject.eof()).
Cheers,
Joseph
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Hall
Sent: Monday, June 28, 2010 7:56 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: Java Delemma
I seem to remember eof not being so easy to search for. That is why
checking that inFile.hasNext()!=null is usually the way to do it.
Correct me if I am wrong.
On 6/28/10, Joseph Lee <joseph.lee22590@xxxxxxxxx> wrote:
> Hi Alex,
> Can't he check for eof (end of file) to really make sure that the routine
> does not insert a new line? If that's the case, then a while loop (or
> similar in Java) with the condition of not eof could be used
> (hypothetically).
> Cheers,
> Joseph
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Hall
> Sent: Monday, June 28, 2010 7:30 PM
> To: programmingblind@xxxxxxxxxxxxx
> 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
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>>>>
>>>
>>>
>>> --
>>> 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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>>>
>>
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>>
>
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
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Have a great day,
Alex (msg sent from GMail website)
mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
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