SCJP Basic 3

Question 1

What is the range of a Java int data type?

Accepted Answer

-2^31 to 2^31 - 1

Answer

Java's int is a 32-bit signed integer, ranging from -2,147,483,648 to 2,147,483,647.

Question 2

Which of the following is NOT a valid Java identifier?

Accepted Answer

2ndValue

Answer

Java identifiers cannot begin with a digit; 2ndValue is invalid.

Question 3

What does the 'static' keyword mean when applied to a variable?

Accepted Answer

The variable is shared across all instances of the class

Answer

A static variable belongs to the class itself rather than any specific instance.

Question 4

What is the output of: System.out.println(10 / 3); in Java?

Accepted Answer

3

Answer

Integer division truncates the decimal; 10 / 3 = 3 in Java.

Question 5

Which access modifier makes a member accessible only within the same class?

Accepted Answer

private

Answer

The private modifier restricts access to within the declaring class only.

SCJP - Sun Certified Java Programmer Practice Test