Can you list the main ways to implement OutputStream in Java?

In Java, OutputStream is an abstract class for writing bytes to various sources. Main implementations of OutputStream include:

• FileOutputStream — writes bytes to a file.
• ByteArrayOutputStream — writes to a byte array in memory.
• BufferedOutputStream — wraps another OutputStream to buffer writes, improving performance.
• DataOutputStream — allows writing primitive data types in a convenient format.
• ObjectOutputStream — serializes Java objects into a stream.
• PipedOutputStream — used for connecting with PipedInputStream, for inter-thread communication.

Example of writing a string to a file using FileOutputStream:

try (OutputStream os = new FileOutputStream("output.txt")) {
    String data = "Hello, OutputStream!";
    os.write(data.getBytes());
} catch (IOException e) {
    e.printStackTrace();
}

Thus, the choice of implementation depends on the task: where and how you need to write data.