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ByteArrayInputStream markSupported() method in Java with Examples

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  • Last Updated : 20 Jul, 2021

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:  

Java




// 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 stream 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.");
        }
    }
}

Output: 

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

reset() invoked
5
6

 

Program 2: 

Java




// 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 stream 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.");
        }
    }
}

Output: 

1
2
3
markSupported() : true

reset() invoked
1
2

 

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


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