1Z0-811 Object-Oriented Programming Practice Question
Exhibit
interface Printable {
void print();
}
class Document implements Printable {
public void print() { System.out.println("Document"); }
}
class Photo extends Document {
public void print() { System.out.println("Photo"); }
}
public class Test {
public static void main(String[] args) {
Document d = new Photo();
d.print();
}
}Refer to the exhibit.
What is the output?
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
✓
Photo
The object is Photo, and print() is overridden, so dynamic binding calls Photo's print method.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Runtime error
Why it's wrong here
No runtime error.
- ✗
No output
Why it's wrong here
Output is printed.
- ✗
Compilation error
Why it's wrong here
The code compiles.
- ✓
Photo
Why this is correct
The object is Photo, and print() is overridden, so dynamic binding calls Photo's print method.
- ✗
Document
Why it's wrong here
The reference type Document does not affect the method call because methods are polymorphic.
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