Java tutorial
import java.io.FileInputStream; import java.io.IOException; import java.io.LineNumberInputStream; public class Main { public static void main(String[] args) throws IOException { FileInputStream fis = new FileInputStream("C:/test.txt"); LineNumberInputStream lnis = new LineNumberInputStream(fis); System.out.println((char) lnis.read()); System.out.println((char) lnis.read()); lnis.mark(0); System.out.println("mark() invoked"); System.out.println((char) lnis.read()); System.out.println((char) lnis.read()); if (lnis.markSupported()) { lnis.reset(); System.out.println("reset() invoked"); System.out.println((char) lnis.read()); System.out.println((char) lnis.read()); } } }