FileInputStream getChannel() Method in Java with Examples

The getChannel() method is a part of Java.io.FileInputStream class. This method will return the unique FileChannel object associated with the file input stream. 

• A channel obtained from the getChannel() method of the Java.io.FileInputStream instance will be "open for reading."
• getChannel() will return the FileChannel object that is associated with "this" FileInputStream instance.
• The channel position will change whenever we read bytes from this stream.
• Whenever the channel's position is changed, the stream's file position will also get changed.
• The number of bytes read from the file will determine the initial position of the returned channel.

Syntax:

public FileChannel getChannel()

Parameter: getChannel() method has no parameter.

Return Type: getChannel() method will return a unique FileChannel object.

How to invoke getChannel() method?

Step 1: First, we have to create an instance of  Java.io.FileInputStream class

FileInputStream fileInputStream =new FileInputStream("tmp.txt");

Step 2: To get the unique FileChannel object associated with this fileInputStream, we will call the getChannel() method

FileChannel fileChannel = fileInputStream.getChannel();

The below program will illustrate the use of the getChannel() method.

Example: Program to get the FileChannel object and then to print the size of the channel's file

Output:

Current size of the file is 48

Note: The programs might not run in an online IDE. Please use an offline IDE and change the Name of the file