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Java PushbackReader markSupported() Method with Example

PushbackReader Class markSupported() method: Here, we are going to learn about the markSupported() method of PushbackReader Class with its syntax and example.
Submitted by Preeti Jain, on April 20, 2020

PushbackReader Class markSupported() method

• markSupported() method is available in java.io package.
• markSupported() method is used to check whether this stream support mark() 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() method otherwise it returns false.

Example:

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

import java.io.*;

public class MarkSupportedOfPBR {
    public static void main(String[] args) throws Exception {
        Reader r_stm = null;
        PushbackReader pb_r = null;

        try {
            // Instantiates Reader and PushbackReader
            r_stm = new StringReader("Java World!!!!");
            pb_r = new PushbackReader(r_stm);

            // By using markSupported() method is to
            // check whether this stream supports
            // mark() method or not
            boolean status = pb_r.markSupported();
            System.out.println("pb_r.markSupported(): " + status);
        } catch (Exception ex) {
            System.out.println(ex.toString());
        } finally {
            // with the help of this block is to
            // free all necessary resources linked
            // with the stream
            if (r_stm != null) {
                r_stm.close();
                if (pb_r != null) {
                    pb_r.close();
                }
            }
        }
    }
}

Output

pb_r.markSupported(): false