Java FilterInputStream mark() Example
FilterInputStream class mark() method example. This example shows you how to use mark() method.
Syntax is : public void mark(int readlimit)
this method marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes. The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated.
Here is the code.
/**
* @(#) MarkFilterInputStream.java
* A class representing use of method mark() of FilterInputStream
class in java.io Package.
* @Version 09-June-2008
* @author Rose India Team
*/
import java.io.*;
public class MarkFilterInputStream extends FilterInputStream {
MarkFilterInputStream(FileInputStream objFin){
super(objFin);
}
public static void main(String[] args) throws IOException{
byte[] byteArrayOut = new byte[]{'M','A','H','E','N','D','R','A'};
/* Create object of ByteArrayOutputStream class to write specified
byte array to the output byte stream. */
ByteArrayOutputStream objByteStream = new ByteArrayOutputStream();
objByteStream.write(byteArrayOut,0,8);
// Create object of ByteArrayInputStream class.
InputStream objInStream = new ByteArrayInputStream(byteArrayOut);
//Create object of MarkSupportedFilterInputStream class.
MarkSupportedFilterInputStream obj =new MarkSupportedFilterInputStream
(objInStream);
// Read from the input stream buffer.
System.out.println("\nFirst element is : "+(char)obj.read());
System.out.println("Next element is : "+(char)obj.read());
// Set the mark position for second element.
obj.mark(1);
System.out.println("Element at second position has marked.");
System.out.println("Next element is : "+(char)obj.read());
System.out.println("Next element is : "+(char)obj.read());
// Reset the BufferedInputStream.
obj.reset();
System.out.println("reset() method call so next element read will be "
+ "next element to the marked element.");
// read character after the reset the buffer.
char nextLetter = (char)obj.read();
System.out.println("The next element read after reset is: "+nextLetter);
}
} |
Output of the program.
First element is : M
Next element is : A
Element at second position has marked.
Next element is : H
Next element is : E
reset() method call so next element read will be next element to the marked element.
The next element read after reset is: H |
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