This 1Z0-829 practice question tests your understanding of utilizing java object-oriented approach. 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.
Exhibit
// File: com/example/Outer.java
public class Outer {
private int x = 10;
class Inner {
public void printX() {
System.out.println(x);
}
}
public static void main(String[] args) {
Outer outer = new Outer();
Outer.Inner inner = outer.new Inner();
inner.printX();
}
}
Refer to the exhibit. What is the result?
Exhibit
// File: com/example/Outer.java
public class Outer {
private int x = 10;
class Inner {
public void printX() {
System.out.println(x);
}
}
public static void main(String[] args) {
Outer outer = new Outer();
Outer.Inner inner = outer.new Inner();
inner.printX();
}
}
A
Prints 10
Inner class can access private members of the outer class.
B
Runtime exception because Inner class is not static.
Why wrong: Inner class instantiation is correct.
C
Compilation error because x is private.
Why wrong: Inner classes can access private fields of the enclosing class.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Prints 10
Option A is correct because the code accesses the private field `x` of the `Outer` class from within the `Inner` class, which is a member inner class. In Java, a non-static inner class has access to all members (including private fields) of its enclosing outer class. The `Inner` class's `printX()` method directly accesses `Outer.this.x`, which is initialized to 10 in the `Outer` constructor, so it prints 10.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Prints 10
Why this is correct
Inner class can access private members of the outer class.
Related concept
Read the scenario before looking for a memorised answer.
✗
Runtime exception because Inner class is not static.
Why it's wrong here
Inner class instantiation is correct.
✗
Compilation error because x is private.
Why it's wrong here
Inner classes can access private fields of the enclosing class.
✗
Prints 0 because x is not initialized in Inner.
Why it's wrong here
x is accessed from Outer instance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think private members are inaccessible to inner classes, or that the inner class must be static to access outer class fields, but Java's member inner classes have full access to all members of the enclosing class, including private ones.
Detailed technical explanation
How to think about this question
Under the hood, the Java compiler generates a synthetic accessor method (e.g., `access$000`) in the outer class to allow the inner class to access private fields, but this is transparent to the developer. The inner class holds an implicit reference to the enclosing outer class instance (`Outer.this`), which is why it can access `x` even if the field is private. This mechanism is crucial for implementing callbacks and event handlers in GUI frameworks like Swing or Android, where inner classes frequently access outer class state.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Utilizing Java Object-Oriented Approach — This question tests Utilizing Java Object-Oriented Approach — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Prints 10 — Option A is correct because the code accesses the private field `x` of the `Outer` class from within the `Inner` class, which is a member inner class. In Java, a non-static inner class has access to all members (including private fields) of its enclosing outer class. The `Inner` class's `printX()` method directly accesses `Outer.this.x`, which is initialized to 10 in the `Outer` constructor, so it prints 10.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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