Given: class Knowing { static final long tooth = 343L; static long doIt(long tooth) { System.out.print(++tooth + " "); return ++tooth; } public static void main(String[] args) { System.out.print(tooth + " "); final long tooth = 340L; new Knowing().doIt(tooth); System.out.println(tooth); } } What is the result?

technology programming languages

  1. 343 340 340

  2. 343 340 342

  3. 343 341 342

  4. 343 341 340

  5. Compilation fails.

  6. An exception is thrown at runtime

Show answer
Correct Option: D

AI Explanation

To answer this question, let's go through the code step by step:

  1. The class "Knowing" is defined, and it has a static final long variable named "tooth" with a value of 343L.

  2. The method "doIt" is defined, which takes a long parameter named "tooth". Inside the method, the value of "tooth" is incremented by one using the prefix increment operator (++tooth). Then, the incremented value of "tooth" is printed.

  3. In the main method, the value of the static final variable "tooth" is printed, which is 343.

  4. A new long variable named "tooth" is declared and initialized with a value of 340L. This variable is local to the main method and shadows the static final variable "tooth" defined in the class.

  5. The "doIt" method is called with the local variable "tooth" as an argument. Inside the method, the value of "tooth" is incremented again and printed.

  6. Finally, the value of the local variable "tooth" is printed again, which is still 340.

Now let's analyze the options:

Option A) 343 340 340 - This option is incorrect because the value of the local variable "tooth" is incremented inside the "doIt" method.

Option B) 343 340 342 - This option is incorrect because the value of the local variable "tooth" is not incremented before it is printed.

Option C) 343 341 342 - This option is incorrect because the value of the local variable "tooth" is not incremented before it is printed.

Option D) 343 341 340 - This option is correct because the value of the local variable "tooth" is incremented inside the "doIt" method, resulting in the output 343 341 340.

Option E) Compilation fails - This option is incorrect because there are no compilation errors in the code.

Option F) An exception is thrown at runtime - This option is incorrect because the code does not throw any exceptions.

Therefore, the correct answer is D) 343 341 340.

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