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 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"); // 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 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(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()
