November 15, 2019 - This tutorial explains how to use the ByteArrayOutputStream in Java IO to write data to an OutputStream and capture that data in a byte array.

In the above example, we have created an array of bytes to store the data returned by the toByteArray() method. We then have used the for loop to access each byte from the array. Here, each byte is converted into the corresponding character using typecasting.

import java.io.*; public class ByteStreamTest { public static void main(String args[])throws IOException { ByteArrayOutputStream bOutput = new ByteArrayOutputStream(12); while( bOutput.size()!= 10 ) { // Gets the inputs from the user bOutput.write("hello".getBytes()); } byte b [] = bOutput.toByteArray(); System.out.println("Print the content"); for(int x = 0; x < b.length; x++) { // printing the characters System.out.print((char)b[x] + " "); } System.out.println(" "); int c; ByteArrayInputStream bInput = new ByteArrayInputStream(b); System.out.println("Converting characters to Upper case " ); for(int y = 0 ; y < 1; y++ ) { while(( c = bInput.read())!= -1) { System.out.println(Character.toUpperCase((char)c)); } bInput.reset(); } } }

May 2, 2024 - An array of output data (in bytes) can be written using the Java.io package’s ByteArrayOutputStream class.

October 20, 2025 - Creates a new ByteArrayOutputStream, with a buffer capacity of the specified size, in bytes.

March 16, 2026 - Submit a bug or feature For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

This is an alternative implementation of the ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 1024 bytes. In contrast to the original it doesn't reallocate the whole memory block but allocates ...

January 20, 2026 - Creates a new ByteArrayOutputStream, with a buffer capacity of the specified size, in bytes.

July 23, 2025 - ByteArrayOutputStream(int buffersize) : creates a new ByteArrayOutputStream with buffersize to write bytes.

This example demonstrates using the reset method to clear buffer content. After reset, the buffer appears empty but retains its capacity. This is useful when you need to reuse the stream for new data without allocating new memory. The underlying byte array isn't shrunk by reset. ByteArrayOutputStream provides toString methods to convert buffer content to strings.

public ByteArrayOutputStream() Constructs a new byte array output stream. The buffer capacity is initially 1024 bytes, though its size increases if necessary. public ByteArrayOutputStream · (int size) Constructs a new byte array output stream, with a buffer capacity of the specified size, in bytes.

December 3, 2025 - Some of the examples of FilterOutputStream are BufferedOutputStream, CheckedOutputStream, CipherOutputStream, DataOutputStream, DeflaterOutputStream, DigestOutputStream, InflaterOutputStream, PrintStream.

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public ByteArrayOutputStream() { this(32); } · /** * Creates a new byte array output stream, with a buffer capacity of · * the specified size, in bytes.

Java ByteArrayOutputStream Class for beginners and professionals with examples on Java IO or Input Output in Java with input stream, output stream, reader and writer class. The java.io package provides api to reading and writing data.

April 10, 2023 - void close(): ByteArrayOutputStream will be closed on calling this method. Now, let us see some of the sample examples.

September 16, 2014 - In this example I created an instance of ByteArrayOutputStream and wrote 10 random bytes into it.

A ByteArrayOutputStream is created. The first string, "Hello, World!", is written to the stream and printed. The reset() method is called, which clears the buffer and makes the stream empty again.

April 9, 2025 - This blog explains Java's ByteArrayInputStream and ByteArrayOutputStream classes with detailed examples, outputs, and key methods. It highlights how to handle byte data in memory for tasks like testing, data conversion, and stream manipulation.