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:
// Java program to implement// the above functionimport 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()); }} |
Output:
5 6 7 Mark() invocation 8 9
Program 2:
// Java program to implement// the above functionimport 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()); }} |
Output:
1 Mark() invocation 2 3
Reference: https://docs.oracle.com/javase/10/docs/api/java/io/ByteArrayInputStream.html#mark(int)