Oracle Exam 1Z0-809 Topic 4 Question 39 Discussion

Actual exam question for Oracle's 1Z0-809 exam

Question #: 39
Topic #: 4

[All 1Z0-809 Questions]

Given:

class Book {

int id;

String name;

public Book (int id, String name) {

this.id = id;

this.name = name;

}

public boolean equals (Object obj) { //line n1

boolean output = false;

Book b = (Book) obj;

if (this.name.equals(b name))}

output = true;

}

return output;

}

and the code fragment:

Book b1 = new Book (101, ''Java Programing'');

Book b2 = new Book (102, ''Java Programing'');

System.out.println (b1.equals(b2)); //line n2

Which statement is true?

AThe program prints true.

BThe program prints false.

CA compilation error occurs. To ensure successful compilation, replace line n1 with:boolean equals (Book obj) {

DA compilation error occurs. To ensure successful compilation, replace line n2 with:System.out.println (b1.equals((Object) b2));

Show Suggested Answer

Suggested Answer: D

by Stephaine at Jan 09, 2023, 02:00 PM

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Dante

1 months ago

This question is a real brain-teaser! I bet the developers who wrote this code had a good laugh when they came up with it.

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Blondell

2 months ago

Oh, I get it now! The 'equals' method is comparing the 'name' attribute, not the 'id' attribute. So the program will print 'true' since the books have the same name.

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Lorean

10 days ago

B) The program prints false.

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Gerri

10 days ago

B) The program prints false.

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Fairy

12 days ago

Oh, I see! The 'equals' method is comparing the 'name' attribute, not the 'id' attribute. So the program will print 'true' since the books have the same name.

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Dalene

12 days ago

Oh, I see! The 'equals' method is comparing the 'name' attribute, not the 'id' attribute.

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Leonida

18 days ago

A) The program prints true.

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Teri

1 months ago

A) The program prints true.

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Jina

2 months ago

I'm not sure about this one. The 'equals' method seems to be implemented correctly, but I might be missing something. I'll have to think about it a bit more.

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Marti

2 months ago

I think the answer is B. The 'equals' method is implemented correctly, and since the 'id' values are different, the method will return 'false'.

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Leonora

5 days ago

User1

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Kathrine

7 days ago

User3

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Emmanuel

12 days ago

User2

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Helene

19 days ago

User1

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Alton

20 days ago

User3: Since the 'id' values are different, the method will return 'false'.

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Gerri

21 days ago

User2: The 'equals' method is implemented correctly.

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Pearline

2 months ago

User1: I think the answer is B.

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Bette

2 months ago

The program should print 'false' because the 'equals' method compares the 'name' attribute, not the 'id' attribute. Even though the books have the same name, they are different objects.

upvoted 0 times