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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Blondell

14 days ago

Wait, the class doesn't implement Comparable? How are we supposed to sort the vehicles then? I'll go with C, a compilation error is bound to happen.

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Brandon

17 hours ago

User1

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Van

17 days ago

I'm not sure, but I think the TreeSet will use the natural ordering of the Vehicle objects based on the compareTo method.

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Antonio

18 days ago

I agree with Genevieve, the code fragment adds vehicles to a TreeSet which will sort them in natural order.

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Genevieve

20 days ago

I think the answer is A) 10123 Ford10124 BMW.

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