JAVA EE: Java Tutorial : Java IO (FileReader class)

Thursday 28 July 2016

Java Tutorial : Java IO (FileReader class)

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Java Tutorial : Java IO (FileReader class)

myfile.txt

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FileReaderDemo.java

import java.io.FileReader;
import java.io.IOException;

/*
 * public FileReader(String fileName) throws
 *                           FileNotFoundException
 * 
 * Parameters:
 * ----------
 * 
 * fileName - the name of the file to read from
 */
public class FileReaderDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReaderDemo fileReaderDemo = new FileReaderDemo();
        fileReaderDemo.readFile();
    }

    private void readFile() throws IOException
    {
        FileReader fileReader = null;

        try
        {

            /*
             * Creates a new FileReader, given the name of
             * the file to read from.
             */
            String fileName = "myfile.txt";
            fileReader = new FileReader(fileName);
            int i;

            /*
             * Reads a single character or -1 if the end of
             * the stream has been reached
             */
            while ((i = fileReader.read()) != -1)
            {
                System.out.print((char) i);
            }
        }
        finally
        {
            if (fileReader != null)
            {
                /*
                 * Closes the stream and releases any system
                 * resources associated with it. Once the
                 * stream has been closed, further read(),
                 * ready(), mark(), reset(), or skip()
                 * invocations will throw an IOException.
                 * Closing a previously closed stream has no
                 * effect.
                 */
                fileReader.close();
            }
        }
    }

}