/*	Punters Lounge JAVA programming course
 *	
 *	Lesson73.java
 *
 *	Author	:	Erik Datapunter
 *	Date	:	12/jun/2004
 *
 *	Reading from a file and writing to a file, appending
 *
 */

// import the library with Input Output objects
import java.io.*;

public class Lesson73 {
    public static void main(String[ ] args) throws Exception {

	/* create a file object of the file to read
	*  create a FileReader object
	*  create a BufferedReader object
	*  we can access the file with the inputfilebuffer object
	*/
	File FromFile = new File("in-file.txt");
	FileReader ReadFile = new FileReader(FromFile);
	BufferedReader inputfilebuffer = new BufferedReader(ReadFile);

	/* create a file object of the file to write
	*  create a FileWriter object
	*  create a BufferedWriter object
	*  we can access the file with the outputfilebuffer object
	*/
	File ToFile = new File("out-file.txt");
	FileWriter WriteFile = new FileWriter(ToFile);
	BufferedWriter outputfilebuffer = new BufferedWriter(WriteFile);
	
	// a String to hold a single line
	int ReadChar;

	// while we have not yet reached the end of the file, read another character
	while ((ReadChar = inputfilebuffer.read()) != -1)
	{
		if ( (ReadChar > 64) & (ReadChar < 89) )
			ReadChar = ReadChar + 32;
			
		else if ( (ReadChar > 96) & (ReadChar < 121) )
			ReadChar = ReadChar - 32;

		outputfilebuffer.write(ReadChar);
	}

	// when the file is read close the stream to the file
	inputfilebuffer.close();
	outputfilebuffer.close();

}
}