ByteArrayInputStream markSupported() method in Java with Examples

The markSupported() method is a built-in method of the Java.io.ByteArrayInputStream method tests if this input stream supports the mark and reset methods. The markSupported method of ByteArrayInputStreamInputStream returns true always

Syntax:

public boolean markSupported()

Parameters: The function does not accepts any parameter.



Return Value: The function returns a boolean value. It returns true if this stream instance supports the mark and reset methods, else false.

Below is the implementation of the above function:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to implement
// the above function
import java.io.*;
  
public class Main {
    public static void main(String[] args) throws Exception
    {
  
        byte[] buf = { 5, 6, 7, 8, 9 };
  
        // Create new byte array input stream
        ByteArrayInputStream exam
            = new ByteArrayInputStream(buf);
  
        // print bytes
        System.out.println(exam.read());
        System.out.println(exam.read());
        System.out.println(exam.read());
  
        System.out.println("Mark() invocation");
  
        // Use of markSupported
        boolean check = exam.markSupported();
        System.out.println("markSupported() : "
                           + check);
  
        if (exam.markSupported()) {
  
            // Use of reset() method :
            // repositioning the stram to marked positions.
            exam.reset();
  
            System.out.println("\nreset() invoked");
            System.out.println(exam.read());
            System.out.println(exam.read());
        }
        else {
            System.out.println("reset() method not supported.");
        }
    }
}

chevron_right


Output:

5
6
7
Mark() invocation
markSupported() : true

reset() invoked
5
6

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to implement
// the above function
import java.io.*;
  
public class Main {
    public static void main(String[] args) throws Exception
    {
  
        byte[] buf = { 1, 2, 3 };
  
        // Create new byte array input stream
        ByteArrayInputStream exam
            = new ByteArrayInputStream(buf);
  
        // print bytes
        System.out.println(exam.read());
        System.out.println(exam.read());
        System.out.println(exam.read());
  
        // Use of markSupported
        boolean check = exam.markSupported();
  
        System.out.println("markSupported() : "
                           + check);
  
        if (exam.markSupported()) {
  
            // Use of reset() method :
            // repositioning the stram to marked positions
            exam.reset();
  
            System.out.println("\nreset() invoked");
            System.out.println(exam.read());
            System.out.println(exam.read());
        }
        else {
            System.out.println("reset() method not supported.");
        }
    }
}

chevron_right


Output:

1
2
3
markSupported() : true

reset() invoked
1
2

Reference: https://docs.oracle.com/javase/10/docs/api/java/io/ByteArrayInputStream.html#markSupported()



My Personal Notes arrow_drop_up

The function of education is to teach one to think intensively and to think critically

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.