ByteArrayInputStream mark() method in Java with Examples

The mark() method is a built-in method of the Java.io.ByteArrayInputStream marks the current position of the input stream. It sets readlimit i.e. maximum number of bytes that can be read before mark position becomes invalid.

Syntax:

public void mark(int arg)

Parameters: The function accepts a single mandatory parameter arg which specifies the maximum limit of bytes that can be read before the mark position becomes invalid.



Return Value: The function returns nothing.

Below is the implementation of the above function:

Program 1:

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// 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");
  
        // mark() invocation;
        exam.mark(0);
        System.out.println(exam.read());
        System.out.println(exam.read());
    }
}

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Output:

5
6
7
Mark() invocation
8
9

Program 2:

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// 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("Mark() invocation");
  
        // mark() invocation;
        exam.mark(3);
        System.out.println(exam.read());
        System.out.println(exam.read());
    }
}

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Output:

1
Mark() invocation
2
3

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



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