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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Blondell

5 hours 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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Jina

1 days 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

9 days 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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Bette

17 days 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.

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