Drag steps to the numbered slots on the right, or tap a step then tap a slot.
Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
1Z0-829 Java I/O API and Securing Applications Practice Question
Order the steps to create an immutable class in Java.
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
✓
Step 1: Declare the class as final. Step 2: Declare all fields as private and final. Step 3: Provide a constructor that initializes all fields (with defensive copying for mutable fields). Step 4: Do not define any setter methods.
Immutability requires no way to change object state after construction. Defensive copying prevents internal state from being altered.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Step 1: Declare the class as final. Step 2: Declare all fields as private and final. Step 3: Provide a constructor that initializes all fields (with defensive copying for mutable fields). Step 4: Do not define any setter methods.
Why this is correct
This is correct because declaring the class final prevents subclassing, making fields final ensures they cannot be reassigned, a constructor initializes all state (with defensive copying for mutable objects), and no setters prevents external modification.
- ✗
Step 1: Declare all fields as private and final. Step 2: Provide a constructor that initializes all fields. Step 3: Declare the class as final. Step 4: Do not define any setter methods.
Why it's wrong here
This is incorrect because the class should be declared final first to prevent subclassing, which could add mutable behavior or override methods. Declaring fields final before ensuring the class is final leaves the possibility of a subclass adding setters or modifying behavior.
- ✗
Step 1: Provide a constructor that initializes all fields. Step 2: Declare all fields as private and final. Step 3: Declare the class as final. Step 4: Do not define any setter methods.
Why it's wrong here
This is incorrect because fields should be declared as final before the constructor is defined; otherwise, the constructor cannot assign to final fields legally. Also, the class should be final to prevent subclassing.
- ✗
Step 1: Do not define any setter methods. Step 2: Declare the class as final. Step 3: Declare all fields as private and final. Step 4: Provide a constructor that initializes all fields.
Why it's wrong here
This is incorrect because a constructor is essential to set initial values; without it, the object cannot be created properly. Also, declaring no setters before the class and fields are set up is meaningless.
Go deeper
Related to this question
About these practice questions
This 1Z0-829 question is part of Courseiva's 513-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 1Z0-829 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 1Z0-829 exam.