SCJP Basic 2

Question 1

Which of the following is a valid declaration of a char in Java?

Accepted Answer

char c = 65;

Answer

A char can be assigned an integer literal within the valid Unicode range (0–65535).

Question 2

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

Accepted Answer

false

Answer

Instance variables of type boolean are initialized to false by default.

Question 3

Which keyword is used to prevent a class from being subclassed?

Accepted Answer

final

Answer

The final keyword on a class prevents any other class from extending it.

Question 4

What will happen if you try to compile a Java file that contains two public classes?

Accepted Answer

Compile error

Answer

A Java source file may contain only one public class, and its name must match the filename.

Question 5

Which of the following correctly declares a two-dimensional array in Java?

Accepted Answer

int[][] arr;

Answer

The correct syntax for declaring a 2D array reference is int[][] arr;

SCJP - Sun Certified Java Programmer Practice Test