Quick Answer
The answer is int x = 0; because this is the standard, straightforward way to declare and initialize an integer variable in Java, assigning the literal value zero to a variable of type int. This syntax is fundamental to integer variable initialization in Java, as it directly allocates memory and sets an initial value in a single statement. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of primitive data types and literal syntax, often appearing in questions that require you to distinguish valid from invalid initialization forms. A common trap is confusing initialization with declaration alone, or forgetting that Java allows underscores in numeric literals for readability, such as int x = 1_000; which the compiler interprets as 1000. Remember the memory tip: "Initialize with equals, underscore is just for show" — underscores in numbers are ignored by the compiler, so they never change the value.
This 1Z0-811 practice question tests your understanding of java basics and syntax. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE are valid ways to declare and initialize an integer variable in Java? (Choose three.)
int x = 2.0;
Why wrong: Double cannot be assigned to int without cast.
int x = 1_000;
Underscore allowed.
int x = 0xG;
Why wrong: G is not hex digit.
int x = 03;
Octal literal for 3.
int x = 0;
Valid.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
int x = 1_000;
Option B is correct because Java allows underscores in numeric literals (introduced in Java 7) to improve readability, and `1_000` is a valid integer literal representing 1000. The compiler simply ignores the underscores during parsing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
int x = 2.0;
Why it's wrong here
Double cannot be assigned to int without cast.
int x = 1_000;
Why this is correct
Underscore allowed.
Related concept
Read the scenario before looking for a memorised answer.
int x = 0xG;
Why it's wrong here
G is not hex digit.
int x = 03;
Why this is correct
Octal literal for 3.
Related concept
Read the scenario before looking for a memorised answer.
int x = 0;
Why this is correct
Valid.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests the distinction between valid integer literal formats and common invalid ones, such as using underscores incorrectly or assuming any letter is valid in hexadecimal, to catch candidates who overlook Java's strict literal syntax rules.
Detailed technical explanation
Integer literals in Java can be expressed in decimal (base 10), octal (prefix 0), hexadecimal (prefix 0x or 0X), or binary (prefix 0b or 0B). Underscores can appear between digits in any base, but not at the beginning, end, or adjacent to a radix prefix. Octal literals like `03` are rarely used in modern code but are still valid, and they can cause confusion if a leading zero is accidentally used for decimal numbers.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: int x = 1_000; — Option B is correct because Java allows underscores in numeric literals (introduced in Java 7) to improve readability, and `1_000` is a valid integer literal representing 1000. The compiler simply ignores the underscores during parsing.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
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