Java switch with constant vs non-constant case labels and fall-through: what happens here? public class Switch2 { final static short x = 2; public static int y = 0; // not constant expression public static void main(String [] args) { for (int z = 0; z < 3; z++) { switch (z) { case y: System.out.print("0 "); // Line 11 case x - 1: System.out.print("1 "); // Line 12 case x: System.out.print("2 "); // Line 13 } } } }

Introduction / Context: This question tests the requirement that case labels in a switch must be constant expressions known at compile time, and also hints at fall-through behavior (though compilation never gets that far here).

Given Data / Assumptions:

• x is final static short x = 2 → a compile-time constant.
• y is public static int y = 0 → not final, thus not a constant expression.
• Switch variable is the loop variable z.

Concept / Approach: Java requires each case label to be a constant expression. case y: uses a non-final variable; the compiler cannot fold it into a constant, so it rejects the code at that line before execution begins.

Step-by-Step Solution: Check label at Line 11: case y: ← invalid because y is not a constant expression. Compiler raises an error referencing Line 11 (or similar wording). Program does not compile; no runtime behavior occurs.

Verification / Alternative check: Change y to final static int y = 0; and the code will compile. Then, with no breaks, output would fall through for each matching case.

Why Other Options Are Wrong: Any output assumes successful compilation. Failing at Line 12 would require an issue with x-1, which is valid since x is final and known at compile time.

Common Pitfalls: Forgetting the final requirement; confusing runtime variable values with compile-time constants; ignoring fall-through only after a successful compile.

Final Answer: Compilation fails at line 11.