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Java ByteArrayOutputStream toByteArray() Method with Example

ByteArrayOutputStream Class toByteArray() method: Here, we are going to learn about the toByteArray() method of ByteArrayOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on March 28, 2020

ByteArrayOutputStream Class toByteArray() method

• toByteArray() method is available in java.io package.
• toByteArray() method is used to instantiate a new buffer of “byte” type with the same size as the current size of this ByteArrayOutputStream.
• toByteArray() 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.
• toByteArray() method does not throw an exception at the time of converting stream to the array.

Syntax:

    public byte[] toByteArray();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is byte[], it returns an array of "byte" type from this ByteArrayOutputStream.

Example:

// Java program to demonstrate the example 
// of byte[] toByteArray() method of 
// ByteArrayOutputStream

import java.io.*;

public class ToByteArrayOfBAOS {
 public static void main(String[] args) throws Exception {

  byte[] b_arr = {
   97,
   98,
   99,
   100
  };
  ByteArrayOutputStream BAOS = null;

  try {
   // Instantiates ByteArrayOutputStream
   BAOS = new ByteArrayOutputStream();

   // By using write() method is to
   // write b_arr to the BAOS
   BAOS.write(b_arr);

   // By using toString() method is 
   // to represent the BAOS as a string
   System.out.print("BAOS.toString(): " + BAOS.toString());

   System.out.println();

   // By using toByteArray() method is to
   // convert the BAOS to byte array
   byte[] converted = BAOS.toByteArray();

   System.out.println("BAOS.toByteArray(): ");
   for (byte b: converted)
    System.out.println(b);


  } catch (Exception ex) {
   System.out.println(ex.toString());

  } finally {
   if (BAOS != null)
    BAOS.close();
  }
 }
}

Output

BAOS.toString(): abcd
BAOS.toByteArray(): 
97
98
99
100