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ByteArrayInputStream markSupported() method in Java with Examples
  • Last Updated : 01 Apr, 2019

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 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.");
        }
    }
}
Output:
5
6
7
Mark() invocation
markSupported() : true

reset() invoked
5
6

Program 2:




// 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.");
        }
    }
}
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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