Java.io.InputStream.markSupported() Method

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Description

The java.io.InputStream.markSupported() method tests if this input stream supports the mark() and reset() method.

Declaration

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

public boolean markSupported()

Parameters

  • NA

Return Value

The method returns true if this stream supports instance the mark and reset method.

Exception

  • NA

Example

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

package com.tutorialspoint;

import java.io.FileInputStream;
import java.io.InputStream;

public class InputStreamDemo {
   public static void main(String[] args) throws Exception {
      InputStream is = null;
      boolean bool = false;      
      
      try{
         // new input stream created
         is = new FileInputStream("C://test.txt");
         
         // returns true if the mark()/reset() supported.
         bool = is.markSupported();
         
         // prints
         System.out.print("Is mark()/reset() supported? ");
         System.out.print(bool);
         
      }catch(Exception e){
         
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases system resources associated with this stream
         if(is!=null)
            is.close();
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program:

ABCDEF

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

Is mark()/reset() supported? false



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