1Z0-803 Question #83: Real Exam Question with Answer & Explanation

The correct answer is A. 10 10. Static variables in Java are class-level variables, meaning there is only one copy shared by all instances of the class and accessible via both class and object references.

Java Basics

Question

What is the result? Class StaticField { static int i = 7; public static void main(String[] args) { StaticFied obj = new StaticField(); obj.i++; StaticField.i++; obj.i++; System.out.println(StaticField.i + " "+ obj.i); } }

Options

A10 10
B8 9
C9 8
D7 10

Explanation

Static variables in Java are class-level variables, meaning there is only one copy shared by all instances of the class and accessible via both class and object references.

Common mistakes.

B. This answer incorrectly implies that obj.i and StaticField.i would hold different values after increments, failing to recognize that a static field is shared.
C. This answer incorrectly assumes that obj.i and StaticField.i are distinct variables after operations, which is false for a static field.
D. This answer incorrectly suggests that StaticField.i would remain 7 or that the values would diverge in a way inconsistent with a shared static variable.

Concept tested. Java static variables, class vs instance fields

Reference. https://docs.oracle.com/javase/tutorial/java/javaOO/classvars.html

Topics

#static members#class variables#object state

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