The class is an input stream filter that provides the added functionality of keeping track of the current line number. A line is a sequence of bytes ending with a carriage return character ('\r'), a newline character ('\n'), or a carriage return character followed immediately by a linefeed character.

Class declaration

Following is the declaration for class −

public class LineNumberInputStream
   extends Reader


Following are the fields for class −

  • protected InputStream in − This is the input stream to be filtered.

Class constructors

Sr.No. Constructor & Description

LineNumberInputStream(InputStream in)

This constructs a newline number input stream that reads its input from the specified input stream.

Class methods

Sr.No. Method & Description
1 int available()

This method returns the number of bytes that can be read from this input stream without blocking.

2 int getLineNumber()

This method returns the current line number.

3 void mark(int readlimit)

This method marks the current position in this input stream.

4 int read()

This method reads the next byte of data from this input stream.

5 int read(byte[] b, int off, int len)

This method reads up to len bytes of data from this input stream into an array of bytes.

6 void reset()

This method repositions this stream to the position at the time the mark method was last called on this input stream.

7 void setLineNumber(int lineNumber)

This method sets the line number to the specified argument.

8 long skip(long n)

This method skips over and discards n bytes of data from this input stream.

Methods inherited

This class inherits methods from the following classes −