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Java ObjectInputStream available() Method with Example

ObjectInputStream Class available() method: Here, we are going to learn about the available() method of ObjectInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 04, 2020

ObjectInputStream 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 without blocking input from this ObjectInputStream.
  • 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 remaining bytes that can be read.

Example:

// Java program to demonstrate the example // of int available() method // of ObjectInputStream import java.io.*; public class AvailableOfOIS { public static void main(String[] args) throws Exception { // Instantiates ObjectOutputStream , ObjectInputStream // FileInputStream and FileOutputStream FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt"); ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm); FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt"); ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm); // By using writeUTF() method is to write // string to the obj_out_stm stream obj_out_stm.writeUTF("JAVA PROGRAMMING!!"); obj_out_stm.flush(); obj_in_stm.skipBytes(2); // By using available() method is to return the // number of available bytes in this obj_in_stm int avail_bytes = obj_in_stm.available(); System.out.println("obj_in_stm.available(): " + avail_bytes); for (int i = 0; i < obj_in_stm.available(); i++) { char ch = (char) obj_in_stm.readByte(); System.out.println("ch:" + ch + " "); } } }

Output

obj_in_stm.available(): 18
ch:J
ch:A
ch:V
ch:A
ch:
ch:P
ch:R
ch:O
ch:G
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