Quick Answer
The correct answer is double, along with int and boolean, as these three are all primitive data types in Java. Primitive data types in Java are predefined by the language and stored directly on the stack for efficiency, unlike objects which reside on the heap. The int type stores 32-bit signed integers, boolean holds true or false values, and double represents 64-bit floating-point numbers. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your ability to distinguish primitives from reference types like String or arrays, a common trap where learners confuse wrapper classes (e.g., Integer) with their primitive counterparts. A reliable memory tip is to remember the eight primitive types with the mnemonic "BYTE SHort Int Long Float Double Char Boolean"—focus on the lowercase spelling, as primitives always start with a lowercase letter.
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 primitive data types in Java? (Choose three.)
int
int is a primitive integer type.
boolean
boolean is a primitive logical type.
String
Why wrong: String is a reference type.
double
double is a primitive floating-point type.
Object
Why wrong: Object is a reference type.
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
Option A is correct because `int` is a primitive data type in Java that stores 32-bit signed integer values. Primitive types are predefined by the language and are not objects, meaning they are stored directly on the stack for efficiency.
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
Why this is correct
int is a primitive integer type.
Related concept
Read the scenario before looking for a memorised answer.
boolean
Why this is correct
boolean is a primitive logical type.
Related concept
Read the scenario before looking for a memorised answer.
String
Why it's wrong here
String is a reference type.
double
Why this is correct
double is a primitive floating-point type.
Related concept
Read the scenario before looking for a memorised answer.
Object
Why it's wrong here
Object is a reference type.
Common exam traps
Oracle often tests the distinction between primitive types and commonly used reference types like `String` and `Object`, exploiting the misconception that `String` behaves like a primitive because of its special language support (e.g., string literals and the `+` operator).
Detailed technical explanation
Java has exactly eight primitive data types: byte, short, int, long, float, double, boolean, and char. Unlike reference types, primitives do not have methods and are passed by value, which avoids heap allocation overhead. A common subtlety is that `char` is unsigned (0 to 65535) and uses Unicode, while `boolean` has no defined size in the JVM specification.
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 — Option A is correct because `int` is a primitive data type in Java that stores 32-bit signed integer values. Primitive types are predefined by the language and are not objects, meaning they are stored directly on the stack for efficiency.
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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE are primitive data types in Java? (Choose three.)
easyWhy A: Option A is correct because `double` is one of the eight primitive data types in Java, used to represent double-precision 64-bit IEEE 754 floating-point numbers. Primitives are predefined by the language and stored directly in stack memory, not as objects.
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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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