Java.io.FilterReader.markSupported() Method

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Description

The java.io.FilterReader.mark(int readAheadLimit) method tells whether this stream supports the mark() operation.

Declaration

Following is the declaration for java.io.FilterReader.markSupported() method:

public boolean markSupported()

Parameters

  • NA

Return Value

This method returns true if this stream support the mark operation.

Exception

  • NA

Example

The following example shows the usage of java.io.FilterReader.markSupported() method.

package com.tutorialspoint;

import java.io.FilterReader;
import java.io.Reader;
import java.io.StringReader;

public class FilterReaderDemo {
   public static void main(String[] args) throws Exception {
      
      FilterReader fr = null;
      Reader r = null;      
      boolean bool = false;
      
      try{
         // create new reader
         r = new StringReader("ABCDEF");
          
         // create new filter reader
         fr = new FilterReader(r) {
         };
         
         // tests if the filter reader supports mark()
         bool=fr.markSupported();
         
         // prints
         System.out.print("If mark() supported? "+bool);
         
      }catch(Exception e){
         
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases system resources associated with this stream
         if(r!=null)
            r.close();
         if(fr!=null)
            fr.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

If mark() supported? true



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