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Java LineNumberInputStream available() Method with Example

LineNumberInputStream Class available() method: Here, we are going to learn about the available() method of LineNumberInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 14, 2020

LineNumberInputStream Class available() method

• available() method is available in java.io package.
• available() method is used to return the number of available bytes that can be read from this LineNumberInputStream.
• available() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• available() method may throw an exception at the time of returning available bytes.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public int available();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is int, it returns the number of bytes left that can be read from this LineNumberInputStream without blocking.

Example:

// Java program to demonstrate the example 
// of int available() method of 
// LineNumberInputStream

import java.io.*;

public class AvailableOfLNIS {
 public static void main(String[] args) throws Exception {
  FileInputStream fis_stm = null;
  LineNumberInputStream line_stm = null;
  int val = 0;

  try {
   // Instantiates FileInputStream
   fis_stm = new FileInputStream("D:\\includehelp.txt");
   line_stm = new LineNumberInputStream(fis_stm);

   // Loop to read until available
   // bytes left
   while ((val = fis_stm.read()) != -1) {
    // By using available() method is to
    // return the available bytes to be read

    int avail_bytes = line_stm.available();

    // Display corresponding byte value
    byte b = (byte) val;

    // Display value of avail_bytes and b
    System.out.print("line_stm.available(): " + avail_bytes);
    System.out.println(" : " + "byte: " + b);
   }
  } catch (Exception ex) {
   System.out.println(ex.toString());
  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (fis_stm != null) {
    fis_stm.close();
    if (line_stm != null) {
     line_stm.close();
    }
   }
  }
 }
}

Output

line_stm.available(): 1 : byte: 74
line_stm.available(): 1 : byte: 65
line_stm.available(): 0 : byte: 86
line_stm.available(): 0 : byte: 65