Given the following code snippet in a Spring Boot service:

medium📝 component behavior Q4 of 15

Spring Boot - Advanced Patterns

boolean isEnabled = featureFlagService.isFeatureEnabled("darkMode");
if (isEnabled) {
  return "Dark mode enabled";
} else {
  return "Dark mode disabled";
}

If the feature flag "darkMode" is set to false, what will be the returned string?

A"Dark mode enabled"

BException thrown

Cnull

D"Dark mode disabled"

Step-by-Step Solution

Solution:

Step 1: Check feature flag value
The flag "darkMode" is false, so isEnabled is false.
Step 2: Follow if-else logic
Since isEnabled is false, the else block runs returning "Dark mode disabled".
Final Answer:
"Dark mode disabled" -> Option D
Quick Check:
Flag false means else block runs [OK]

Quick Trick: False flag triggers else block return [OK]

Common Mistakes:

Assuming true when flag is false
Expecting null or exception instead of else return

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Given the following code snippet in a Spring Boot service:

Step 1: Check feature flag value

Step 2: Follow if-else logic

Final Answer:

Quick Check:

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