1Z0-811 Java Language Fundamentals 2

Question 1

What is the result of compiling and running the following code?

int x = 5;
System.out.println(x++ + ++x);

Accepted Answer

12

Answer

x++ returns 5 (then x becomes 6), ++x increments to 7 and returns 7, so 5+7=12.

Question 2

Which of the following is a valid declaration of a multi-dimensional array in Java?

Accepted Answer

int[][] arr = new int[3][3];

Answer

int[][] arr = new int[3][3]; is the standard Java syntax for a 2D array declaration and initialization.

Question 3

Which keyword is used to prevent a variable from being reassigned after initialization?

Accepted Answer

final

Answer

The 'final' keyword prevents reassignment of a variable once it has been initialized.

Question 4

What is the default value of an instance variable of type boolean in Java?

Accepted Answer

false

Answer

Instance variables of type boolean are automatically initialized to false if not explicitly set.

Question 5

Which of the following correctly describes operator precedence between * and +?

Accepted Answer

* has higher precedence than +

Answer

Multiplication (*) has higher precedence than addition (+), so 2+3*4 evaluates to 14, not 20.

(1Z0-811) Oracle Java SE11 Programmer Practice Test