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ObjectInputStream available() method in Java with examples

  • Last Updated : 28 May, 2019

The available() method of the ObjectInputStream class in Java returns the number of bytes that can be read without blocking the stream.

Syntax:

public int available()

Parameters: This method does not accept any parameter.

Return Value: This method returns the number of available bytes.

Below program illustrate the above method:

Program 1:




// Java program to illustrate
// the above method
  
import java.io.*;
  
public class GFG {
    public static void main(String[] args) throws Exception
    {
  
        FileOutputStream out
            = new FileOutputStream("gopal.txt");
        ObjectOutputStream out1
            = new ObjectOutputStream(out);
  
        // write something in the file
        out1.writeUTF("Geeks For Geeks");
  
        // Flushes the Stream
        out1.flush();
  
        // Closes the stream
        out1.close();
  
        // create an ObjectInputStream
        // for the file we created before
        ObjectInputStream example
            = new ObjectInputStream(
                new FileInputStream(
                    "gopal.txt"));
  
        // Print the number of bytes available
        System.out.println(example.available());
        example.close();
    }
}

Output:

Reference: https://docs.oracle.com/javase/10/docs/api/java/io/ObjectInputStream.html#available()

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