Quick Answer
The answer is 10, 0xA, and 010. These three are all valid int literal formats in Java because the language supports multiple number bases for integer literals: decimal (no prefix), hexadecimal (prefix 0x or 0X), and octal (prefix 0). The literal 10 is a standard decimal integer, 0xA is hexadecimal for decimal 10, and 010 is octal, which also equals decimal 8—not 10—so be careful: 010 is valid syntax but represents a different value. On the Oracle Java Foundations 1Z0-811 exam, this question tests your recognition of valid literal prefixes and the trap that a leading zero forces octal interpretation, which often catches students who think 010 equals ten. A common memory tip is to remember the prefixes: hex starts with 0x, octal starts with just 0, and binary (though not in this question) uses 0b. So when you see a number like 0xA, think hex; when you see 010, think octal, not decimal ten.
This 1Z0-811 practice question tests your understanding of primitives, strings and operators. 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 of the following are valid ways to declare and initialize a variable of type int? (Choose three.)
int b = 0xA;
Correct: hexadecimal literal 0xA equals 10 decimal.
int e = 10.0;
Why wrong: Incorrect: 10.0 is a double literal, and assigning to int requires a cast.
int d = 010;
Correct: octal literal 010 equals 8 decimal.
int c = 0b2;
Why wrong: Incorrect: binary literal can only contain 0 and 1; '2' is invalid.
int a = 10;
Correct: decimal literal 10 is valid for int.
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 b = 0xA;
Option A is correct because `0xA` is a hexadecimal integer literal in Java, representing the decimal value 10. Java allows hexadecimal literals using the prefix `0x` or `0X`, and they are valid for initializing an `int` variable.
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 b = 0xA;
Why this is correct
Correct: hexadecimal literal 0xA equals 10 decimal.
Related concept
Read the scenario before looking for a memorised answer.
int e = 10.0;
Why it's wrong here
Incorrect: 10.0 is a double literal, and assigning to int requires a cast.
int d = 010;
Why this is correct
Correct: octal literal 010 equals 8 decimal.
Related concept
Read the scenario before looking for a memorised answer.
int c = 0b2;
Why it's wrong here
Incorrect: binary literal can only contain 0 and 1; '2' is invalid.
int a = 10;
Why this is correct
Correct: decimal literal 10 is valid for int.
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 invalid ones, such as using a digit 2 in a binary literal or assigning a floating-point literal without a cast, which candidates might overlook due to familiarity with other languages.
Detailed technical explanation
Java supports integer literals in decimal (base 10), hexadecimal (base 16, prefix `0x`), octal (base 8, prefix `0`), and binary (base 2, prefix `0b`). The octal literal `010` in option C equals decimal 8, and `0xA` equals decimal 10. Under the hood, all integer literals are stored as 32-bit two's complement values for `int` type, and the compiler evaluates the literal at compile time. In real-world scenarios, hexadecimal and binary literals are commonly used for bitmask operations or low-level programming.
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
Primitives, Strings and Operators — This question tests Primitives, Strings and Operators — Read the scenario before looking for a memorised answer..
The correct answer is: int b = 0xA; — Option A is correct because `0xA` is a hexadecimal integer literal in Java, representing the decimal value 10. Java allows hexadecimal literals using the prefix `0x` or `0X`, and they are valid for initializing an `int` variable.
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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