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catch ( IOException e ) { System.err.println( "FileCopy: " + e.getMessage() ); System.exit( 1 ); } finally { // Close the files. try { in.close(); out.close(); } catch( Exception e ) {} } }//main } //FileCopy When the program opens the BufferedOutputStream, the new FileOutputStream opens an existing file for overwriting, or, if the output file does not exist, it creates a new output file for writing. There is a second parameter in the constructor for the FileOutputStream which would allow a program to append to an existing file, but we have not used that here. With the read() method of the BufferedInputStream, either a byte of data is returned, or, if the program encounters the EOF, a binary -1 is returned. As long as the read() continues to return bytes, the program calls write() to copy the data. Though you see individual bytes being read and written, the transfer is much more efficient than you might think, because the InputStream and OutputStream are buffered. SCANNER Often we need to read information from the user of the program. We might prompt the user, for example, to ask them what kind of car they drive. We can ask the question of the user by displaying the question using System.out.println(). We have shown many examples of displaying information on the screen. Java provides a class called Scanner that makes it easy to read information from the keyboard into the program. To create a scanner object for reading from the keyboard, we simply pass the standard input stream to the constructor for a new Scanner. For example, here is a snippet of code to create a new Scanner for reading from the keyboard, and then to use the Scanner to read a floating-point number: ... Scanner scanner = new Scanner(System.in); // Obtain input System.out.print("Enter balance: "); double balance = scanner.nextDouble(); ... The Scanner class has many methods, and you should consult the Java API documentation to see what they are, and what choices you have. You can also use a Scanner to read from a file. To associate a Scanner with a file of text, just pass a FileReader object to the Scanner constructor: sc = new Scanner(new FileReader( myFile.txt ) ); To read lines of text, you can use the nextLine() method of Scanner to transfer a line of text into a String variable. You can also use the hasNextLine() method to test to see whether there is something to read. Here s a snippet of code to loop, reading text for processing into a String called lineOfData.
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String lineOfData; Scanner sc = new Scanner( myFile.txt ); while( sc.hasNextLine() ) { lineOfData = sc.nextLine(); ... }//while When the program reaches the EOF, the hasNextLine() method will return false, and the program will exit the while loop. PRINTWRITER The PrintWriter is another very convenient I/O class; it makes writing text to a file as easy as writing text to the display. To create a PrintWriter that is associated with a file, you simply pass the name of the file to the constructor. Then you can write to the file simply using the print() and println() methods you have learned to use for writing to the display. A PrintWriter can be used with any output stream, but a very common use is to make it very easy to write formatted text to a file. Here is a simple program that reads lines of text typed at the keyboard, and writes the same text into a file using a PrintWriter. Using the println() method, this program adds a line number at the front of each line as it writes the line to the file. import java.io.*; import java.util.*; //PrintWriter is here //Scanner is here
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public class PrintToFile{ public static void main( String[] args) { PrintWriter Scanner String String int myWriter; sc; lineOfData; fileName; lineNumber;
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try { System.out.print("Enter file name: " ); sc = new Scanner( System.in ); fileName = sc.nextLine(); myWriter = new PrintWriter( fileName ); System.out.println( "Now enter lines of text." ); System.out.println( "When you are done, " + "type only Cntrl/z (EOF) on the line." ); lineNumber = 1; while( sc.hasNextLine() ) { lineOfData = sc.nextLine(); myWriter.println( lineNumber + ". " + lineOfData ); lineNumber++; } myWriter.close(); } catch( IOException e ) {
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