Java Primitive Data Types
Which THREE of the following are primitive data types in Java?
Quick Answer
The answer is `boolean`, along with `double`, as both are among Java’s eight primitive data types. These types, including `byte`, `short`, `int`, `long`, `float`, `char`, and `boolean`, store simple values directly in memory rather than as object references, making them the foundation of all Java programs. On the Oracle Java Foundations 1Z0-811 exam, you will be asked to identify which types are primitives versus reference types like `String` or arrays—a common trap is confusing `String` or `Integer` (a wrapper class) with a primitive. Remember that primitives always start with a lowercase letter, while reference types like `String` are capitalized. A helpful memory tip is the mnemonic “**B**e **S**ure **I** **L**ove **F**loats **D**ouble **C**hocolate **B**ars” to recall `boolean`, `short`, `int`, `long`, `float`, `double`, `char`, and `byte`. Mastering these eight types is essential because every Java expression and operation ultimately relies on them.
⚠ Common exam trap
Oracle often tests the distinction between primitive types and reference types, trapping candidates who mistakenly think `String` or `array` are primitives because they are commonly used and have literal syntax (e.g., `"hello"` or `{1,2,3}`).
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
double
`double` is one of the eight primitive data types in Java, used to store floating-point numbers with double precision (64-bit IEEE 754). It is a fundamental type that holds a numeric value directly, not an object reference.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
String
Why it's wrong here
Class type.
- ✓
double
Why this is correct
Primitive type.
- ✓
int
Why this is correct
Primitive type.
- ✗
array
Why it's wrong here
Reference type.
- ✓
boolean
Why this is correct
Primitive type.
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Same concept, more angles
2 more ways this is tested on 1Z0-811
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 of the following are primitive data types in Java?
hard- A.void
- ✓ B.boolean
- ✓ C.int
- D.String
- ✓ E.char
Why B: (boolean) is correct because boolean is one of the eight primitive data types in Java, representing a single bit of information with only two possible values: true or false. It is not an object and does not have methods, unlike reference types such as Boolean (the wrapper class).
Variation 2. Which primitive data type should be used to store a single character?
easy- A.int
- B.byte
- ✓ C.char
- D.String
Why C: The `char` primitive data type in Java is specifically designed to store a single 16-bit Unicode character, ranging from '\u0000' (0) to '\uffff' (65,535). It can represent any character in the Unicode standard, including letters, digits, and symbols, making it the appropriate choice for a single character value.
JA
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Senior Network & Security Engineer · founder of Courseiva
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.