Given: class Uber { static int y = 2; Uber(int x) { this(); y = y * 2; } Uber() { y++; } } class Minor extends Uber { Minor() { super(y); y = y + 3; } public static void main(String [] args) { new Minor(); System.out.println(y); } } What is the result?
6
7
8
9
Compilation fails.
An exception is thrown.
Minor() calls super(y), invoking Uber(int x). That constructor calls this() to Uber(), which increments y from 2 to 3. Then y *= 2 makes y = 6. Back in Minor(), y += 3 makes y = 9. The static variable y holds these values across constructor calls.
To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) 6 - This option is incorrect because the final value of y is not 6.
Option B) 7 - This option is incorrect because the final value of y is not 7.
Option C) 8 - This option is incorrect because the final value of y is not 8.
Option D) 9 - This option is correct.
Option E) Compilation fails - This option is incorrect because the code compiles without any errors.
Option F) An exception is thrown - This option is incorrect because the code does not throw any exceptions.
Now, let's analyze the code to determine the final value of y:
The Minor class extends the Uber class. When an object of the Minor class is created, the constructor Minor() is called.
Inside the Minor constructor, super(y) is called, which invokes the constructor Uber(int x) of the Uber class with the value of y.
In the Uber(int x) constructor, this() is called, which invokes the default constructor Uber() of the Uber class. Inside the Uber() constructor, y is incremented by 1.
After the this() call, y becomes 3.
Then, in the Uber(int x) constructor, y = y * 2 is executed, so y becomes 6.
Back in the Minor constructor, y = y + 3 is executed, so y becomes 9.
Finally, System.out.println(y) prints the value of y, which is 9.
Therefore, the correct answer is option D) 9.