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Java BufferedInputStream markSupported() Method with Example

BufferedInputStream Class markSupported() method: Here, we are going to learn about the markSupported() method of BufferedInputStream Class with its syntax and example.
Submitted by Preeti Jain, on March 01, 2020

BufferedInputStream Class markSupported() method

• markSupported() method is available in java.io package.
• markSupported() method is used to check whether this BufferedInputStream supports mark() and reset() method or not.
• markSupported() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• markSupported() method does not throw an exception at the time of checking supporting methods.

Syntax:

    public boolean markSupported();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is boolean, it returns true when this stream supports mark() and reset() method otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean markSupported() method of 
// BufferedInputStream

import java.io.*;

public class MarkSupportedBIS {
    public static void main(String[] args) throws Exception {
        // To open text file by using 
        // FileInputStream
        FileInputStream fis = new FileInputStream("e:/includehelp.txt");

        // By using BufferedInputStream() isto change
        // the stream fis into buff_str
        BufferedInputStream buff_str = new BufferedInputStream(fis);

        // By using available() method is to
        // return the no. of bytes to be left 
        // for reading
        Integer n_byte = buff_str.available();
        System.out.println("Left avail bytes = " + n_byte);

        // By using markSupported() method check 
        // whether this stream buff_str support
        // mark() and reset() or not
        boolean status1 = buff_str.markSupported();
        System.out.println("buff_str.markSupported(): " + status1);

        boolean status2 = fis.markSupported();
        System.out.println("fis.markSupported(): " + status2);

        fis.close();
        buff_str.close();
    }
}

Output

Left avail bytes = 33
buff_str.markSupported(): true
fis.markSupported(): false