File Reader and File Writer class with its methods and examples

FileReader class:

• Syntax: 

          java.lang.Object

                  java.io.Reader

                          java.io.InputStreamReader

                                  java.io.FileReader

• It is most convince class for writing character files. 
• The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. 
• It has one field, three constructors and seventeen methods.
• The four methods derived from the InputStreamReader class.
• The five methods derived from the Reader class.
• The eight methods derived from the Object class.
• Field: protected Object lock
• Use: The object used to synchronize operations on this stream
• This field is inherited from class java.io.Reader
• Constructor: 
• Syntax:
• public FileReader(File file) throws FileNotFoundException
• public FileReader(FileDescriptor fd)
• public FileReader(String fileName) throws FileNotFoundException
• Use:
• Creates a new FileReader, given the File to read from.
• Creates a new FileReader, given the FileDescriptor to read from.
• Parameters:
• file - the File to read from
• fd - the FileDescriptor to read from
• fileName - the name of the file to read from
• Throws:
• FileNotFoundException - if the file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading.
• Methods:
• The following methods are inherited from class java.io.InputStreamReader
• close, getEncoding, read, ready
• The following methods are inherited from class java.io.Reader
• mark, markSupported, read, reset, skip
• The following methods are inherited from class java.lang.Object
• clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait

FileWriter class:

• Syntax: 

          java.lang.Object

                  java.io.Reader

                          java.io.OutputStreamReader

                                  java.io.FileWriter

• Convenience class for writing character files. 
• The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. 
• FileWriter is meant for writing streams of characters. 
• For writing streams of raw bytes, consider using a FileOutputStream.
• It has one field, six constructors and fifteen methods.
• The four methods derived from the OutputStreamReader class.
• The two methods derived from the Writer class.
• The nine methods derived from the Object class.
• Field: protected Object lock
• Use: The object used to synchronize operations on this stream
• This field is inherited from class java.io.Writer
• Constructor: 
• Syntax:
• public FileWriter(File file) throws IOException
• public FileWriter(File file, boolean append) throws IOException
• public FileWriter(FileDescriptor fd)
• public FileWriter(String fileName) throws IOException
• public FileWriter(String fileName, boolean append) throws IOException
• Use:
• Constructs a FileWriter object given a File object.
• Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.
• Constructs a FileWriter object associated with a file descriptor.
• Constructs a FileWriter object given a file name.
• Constructs a FileWriter object given a file name with a boolean indicating whether or not to append the data written.
• Parameters:
• file - a File object to write to.
• append - if true, then bytes will be written to the end of the file rather than the beginning
• fd - FileDescriptor object to write to.
• fileName - String The system-dependent filename.
• Throws:
• IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason
• Methods:
• The following methods are inherited from class java.io.OutputStreamWriter
• close, flush, getEncoding, write
• The following methods are inherited from class java.io.Writer
• append, write
• The following methods are inherited from class java.lang.Object
• clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait

Example (Read File):

• Step 01: Create a .txt file.
  
• Step 02: Write a JAVA program.
  
• Step 03: Enjoy the Output.
  

Example (Write File):

• Step 01: Write a JAVA program.
  
• Step 02: Enjoy the Output.
  
• Step 03: Read data from File, also.
  

Example (Copy File):

• Step 01:Write a .txt file. 
  
• Step 02: Write a .JAVA program.
  
• Step 03: Run the program
  
• Step 04: See the output in file, also.