1Z0-829 Controlling Program Flow Practice Question
Given: Object obj = null; String s = switch(obj) { case null -> "null"; case String str -> str; default -> "other"; }; What is the result?
⚠ Common exam trap
Test-takers frequently assume a switch expression throws NullPointerException on a null selector, but Java 14+ explicitly allows 'case null' to handle null values, making the code valid and producing the expected result.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
"null"
In Java 14+, switch expressions can handle null values directly using a 'case null' label. Since obj is null, the switch matches the 'case null' branch and returns the string "null". Option D is correct because the code compiles and executes without error, producing "null".
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Compilation error
Why it's wrong here
Incorrect; the code compiles.
- ✗
NullPointerException
Why it's wrong here
Incorrect; the null case prevents NPE.
- ✗
"other"
Why it's wrong here
Incorrect; the default is not reached.
- ✓
"null"
Why this is correct
Correct: the null case matches and returns "null".
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