Java - Files and I/O-FileReader Class - Java

This class inherits from the InputStreamReader class. FileReader is used for reading streams of characters.

This class has several constructors to create required objects. Following is the list of constructors provided by the FileReader class.

Sr.No.

Constructor & Description

1

FileReader(File file)

This constructor creates a new FileReader, given the File to read from.

2

FileReader(FileDescriptor fd)

This constructor creates a new FileReader, given the FileDescriptor to read from.

3

FileReader(String fileName)

This constructor creates a new FileReader, given the name of the file to read from.

Once you have FileReader object in hand then there is a list of helper methods which can be used to manipulate the files.

Sr.No.

Method & Description

1

public int read() throws IOException

Reads a single character. Returns an int, which represents the character read.

2

public int read(char [] c, int offset, int len)

Reads characters into an array. Returns the number of characters read.

Example

Following is an example to demonstrate class −

This will produce the following result −

Output

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