[Solved] Given this serializer code snippet, what will serialize() return for input "hello"?public byte[] serialize(String topic, String data) { return data == null ? | Kafka

Kafka - Advanced Stream Processing

Given this serializer code snippet, what will serialize() return for input "hello"?

public byte[] serialize(String topic, String data) {
    return data == null ? null : data.getBytes(StandardCharsets.UTF_8);
}

A[104, 101, 108, 108, 111]

Bnull

C["h", "e", "l", "l", "o"]

DThrows NullPointerException

Step-by-Step Solution

Solution:

Step 1: Understand serialize method
If data is not null, it returns UTF-8 bytes of the string.
Step 2: Convert "hello" to bytes
"hello" in UTF-8 bytes is [104, 101, 108, 108, 111].
Final Answer:
[104, 101, 108, 108, 111] -> Option A
Quick Check:
"hello" bytes = [104,101,108,108,111] [OK]

Quick Trick: String.getBytes(UTF-8) returns byte array [OK]

Common Mistakes:

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