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FileReader


java.io

Class FileReader

  • All Implemented Interfaces:
    Closeable, AutoCloseable, Readable


    public class FileReader
    extends InputStreamReader
    A specialized Reader that reads from a file in the file system. All read requests made by calling methods in this class are directly forwarded to the equivalent function of the underlying operating system. Since this may induce some performance penalty, in particular if many small read requests are made, a FileReader is often wrapped by a BufferedReader.
    See Also:
    BufferedReader, FileWriter
    • Constructor Detail

      • FileReader

        public FileReader(File file)
                   throws FileNotFoundException
        Constructs a new FileReader on the given file.
        Parameters:
        file - a File to be opened for reading characters from.
        Throws:
        FileNotFoundException - if file does not exist.
      • FileReader

        public FileReader(FileDescriptor fd)
        Construct a new FileReader on the given FileDescriptor fd. Since a previously opened FileDescriptor is passed as an argument, no FileNotFoundException can be thrown.
        Parameters:
        fd - the previously opened file descriptor.
      • FileReader

        public FileReader(String filename)
                   throws FileNotFoundException
        Construct a new FileReader on the given file named filename.
        Parameters:
        filename - an absolute or relative path specifying the file to open.
        Throws:
        FileNotFoundException - if there is no file named filename.


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