Java.io.FilterInputStream.markSupported() Method

Description

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

Declaration

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

public boolean markSupported()

Parameters

Return Value

The method returns true if the stream type supports mark and reset methods.

Exception

• NA

Example

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

package com.tutorialspoint;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

public class FilterInputStreamDemo {
   public static void main(String[] args) throws Exception {
      
      InputStream is = null; 
      FilterInputStream fis = null; 
      boolean bool = false;
      
      try{
         // create input streams
         is = new FileInputStream("C://test.txt");
         fis = new BufferedInputStream(is);
         
         // tests if the input stream supports mark() and reset()
         bool = fis.markSupported();
         
         // prints
         System.out.print("Supports mark and reset methods: "+bool);
         
      }catch(IOException e){
         
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases any system resources associated with the stream
         if(is!=null)
            is.close();
         if(fis!=null)
            fis.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:

Supports mark and reset methods: true