BufferReader and BufferWritter

**Nhedro** · February 13th, 2012, 11:49 AM

I got an home assignment, that is composed by writting a class where i must have 3 methods:

>static void removeLetters( BufferedReader orders, BufferedReader in, BufferedWriter out ) throws IOException;
>static void capitalize( BufferedReader orders, BufferedReader in, BufferedWriter out ) throws IOException;
>static void histogram( BufferedReader in, BufferedWriter out ) throws IOException;

I started by searching the API to learn the methods i could use, ok... then i realized how can i do this?

I thought on puting the buffers into strings and then do what i need to them.

ok, i will use "(char)in.read()" for example, but i dont know the length of the buffer, cause i need this to do a "for" or a "do{...}while" to know how many char's i must put in the string.

I would like to know how can i know the length, or if u know a easier way to do this, that a "Java begginer" can do.

Thanks for your time

**Norm** · February 13th, 2012, 03:06 PM

I would like to know how can i know the length

The length of what? What is the source of the bytes you are reading?

**Nhedro** · February 13th, 2012, 04:04 PM

the source is a .txt that was given to me, but it mut read any Buffer given; i must build those methods, anid would like to know if there is a way to know the length of the BufferReader, for example:

	public static void removeLetters( BufferedReader orders, BufferedReader in, BufferedWriter out ) throws IOException{
 
		for(int i = 0; i<=*;i++){
			StringBuilder ord1 = sb.append((char)orders.read());
		}
		for(int j = 0; j<=*;j++){
			StringBuilder in1 = sb.append((char)in.read());
		}
//              *     the length of the BufferReader orders, something like orders.length
//              **   the length of the BufferReader in, something like in.length
      }

this is my idea, but if anyone have other idea, i would like to discuss which one is better, and learn some more.

**Norm** · February 13th, 2012, 04:10 PM

If you are reading from a file, you can use the File class to get the size of the file. If you create a File object for the file you can use one of its methods to get the file's size.

If you use a class like StringBuilder to read the bytes into, you don't need to worry about the number of bytes. The class wil take care of that for you. Don't use a for loop for reading, use a while loop and test the value returned by the read method. It will return a special code when the bytes have all been read. When you get that code, exit the while loop.

**Nhedro** · February 13th, 2012, 05:26 PM

Thanks Norm, i think i understood, i will try it

.

**Nhedro** · February 14th, 2012, 09:30 AM

I've done it if someone is curious i post the code

static void removeLetters( BufferedReader orders, BufferedReader in, BufferedWriter out ) throws IOException;{
 
 
             String s;
             while((s=orders.readLine())!=null)[
 
             //use the String s to whatever u nead, which contains the current line of bufferreader orders;         
 
             ]
}

Once again, thanks Norm

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