Java.io.LineNumberInputStream.mark() Method

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Description

The java.io.LineNumberInputStream.mark(int readlimit) method marks the current postion in this input stream. A subsequent call to the reset method repositions this stream so that the subsequent reads re-read the same byte.

Declaration

Following is the declaration for java.io.LineNumberInputStream.mark(int readlimit) method:

public void mark(int readlimit)

Parameters

  • readlimit -- the maximum limit of bytes that can be read before the mark position becomes invalid.

Return Value

The method does not return any value.

Exception

  • NA

Example

The following example shows the usage of java.io.LineNumberInputStream.mark(int readlimit) method.

package com.tutorialspoint;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.LineNumberInputStream;

public class LineNumberInputStreamDemo {
   public static void main(String[] args) throws IOException {
      
      LineNumberInputStream lnis = null;
      FileInputStream fis =null;
      int i,j;
      char c;
      
      try{
         // create new input streams
         fis = new FileInputStream("C:/test.txt");
         lnis = new LineNumberInputStream(fis);
         
         // reads and prints data from input stream
         System.out.println((char)lnis.read());
         System.out.println((char)lnis.read());
         
         // mark invoked at this position
         lnis.mark(0);
         System.out.println("mark() invoked");
         System.out.println((char)lnis.read());
         System.out.println((char)lnis.read());
         
         // if this input stream supports mark() an reset()
         if(lnis.markSupported())
         {
            // reset() repositioned the stream to the mark
            lnis.reset();
            System.out.println("reset() invoked");
            System.out.println((char)lnis.read());
            System.out.println((char)lnis.read());
         }
      }catch(Exception e){
         
         // if any error occurs
         e.printStackTrace();
      }finally{
         
         // closes the stream and releases any system resources
         if(fis!=null)
            fis.close();
         if(lnis!=null)
            lnis.close();      
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program:

ABCDE

Let us compile and run the above program, this will produce the following result:

A
B
mark() invoked
C
D



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