Oracle Exam 1Z0-809 Topic 2 Question 8 Discussion

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

Question #: 8
Topic #: 2

[All 1Z0-809 Questions]

Given:

class Vehicle {

int vno;

String name;

public Vehicle (int vno, String name) {

this.vno = vno,;

this.name = name;

}

public String toString () {

return vno + '':'' + name;

}

and this code fragment:

Set vehicles = new TreeSet <> ();

vehicles.add(new Vehicle (10123, ''Ford''));

vehicles.add(new Vehicle (10124, ''BMW''));

System.out.println(vehicles);

What is the result?

A10123 Ford10124 BMW

B10124 BMW10123 Ford

CA compilation error occurs.

DA ClassCastException is thrown at run time.

Show Suggested Answer

Suggested Answer: D

by Shalon at May 05, 2022, 04:06 AM

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Annmarie

28 days ago

Ah, the good old 'Vehicle doesn't know how to drive itself' problem. Guess we'll have to call an Uber to get these cars in order.

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Daniela

29 days ago

Ah, the old 'forget to implement Comparable' trick. Classic! I'm feeling lucky, so I'm going with D, a good old ClassCastException is the way to go.

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Arlene

30 days ago

Hold up, is this a trick question? If the class doesn't implement Comparable, how is the TreeSet going to know how to sort the vehicles? I'm going with C, gotta be a compilation error.

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Lea

1 months ago

Hah, looks like someone forgot the Comparable interface. I'm betting on D, a ClassCastException is the only logical outcome here.

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Frank

2 days ago

I think you're right, without implementing the Comparable interface, a ClassCastException will be thrown.

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2 months ago

I think the answer is A) 10123 Ford10124 BMW.

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