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Java FilterReader markSupported() Method with Example

FilterReader Class markSupported() method: Here, we are going to learn about the markSupported() method of FilterReader Class with its syntax and example.
Submitted by Preeti Jain, on April 03, 2020

FilterReader Class markSupported() method

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

Example:

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

import java.io.*;

public class MarkSupportedOfFR {
 public static void main(String[] args) throws Exception {
  Reader r_stm = null;
  FilterReader fr_stm = null;

  try {
   // Instantiates StringReader and 
   // FilterReader
   r_stm = new StringReader("JavaWorld!!!!");
   fr_stm = new FilterReader(r_stm) {};

   // By using markSupported() method is to
   // check whether the stream fr_stm support
   // mark() or not
   boolean status = fr_stm.markSupported();
   System.out.println("fr_stm.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 (fr_stm != null) {
    fr_stm.close();
   }
  }
 }
}

Output

fr_stm.markSupported(): true