1z0-809: Java SE 8 Programmer II - Free download from Exam Hub

Given the definition of the Vehicle class:

Class Vehhicle {

int distance;//line n1

Vehicle (int x) {

this distance = x;

}

public void increSpeed(int time) { //line n2

int timeTravel = time; //line n3

class Car {

int value = 0;

public void speed () {

value = distance /timeTravel;

System.out.println (“Velocity with new speed”+value+”kmph”);

}

new Car().speed();

}

and this code fragment:

Vehicle v = new Vehicle (100);

v.increSpeed(60);

What is the result?

Velocity with new speed
A compilation error occurs at line n1.
A compilation error occurs at line n2.
A compilation error occurs at line n3.

Correct answer: A

Given:

IntStream stream = IntStream.of (1,2,3);

IntFunction<Integer> inFu= x -> y -> x*y;//line n1

IntStream newStream = stream.map(inFu.apply(10)); //line n2

newStream.forEach(System.output::print);

Which modification enables the code fragment to compile?

Replace line n1 with:
IntFunction<UnaryOperator> inFu = x -> y -> x*y;
Replace line n1 with:
IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
Replace line n1 with:
BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
Replace line n2 with:
IntStream newStream = stream.map(inFu.applyAsInt (10));

Correct answer: B

Given the code fragment:

List<Integer> values = Arrays.asList (1, 2, 3);

values.stream ()

.map(n -> n*2) //line n1

.peek(System.out::print) //line n2

.count();

What is the result?

246
The code produces no output.
A compilation error occurs at line n1.
A compilation error occurs at line n2.

Correct answer: A

Given the code fragment:

public class Foo {

public static void main (String [ ] args) {

Map<Integer, String> unsortMap = new HashMap< > ( );

unsortMap.put (10, “z”);

unsortMap.put (5, “b”);

unsortMap.put (1, “d”);

unsortMap.put (7, “e”);

unsortMap.put (50, “j”);

Map<Integer, String> treeMap = new TreeMap <Integer, String> (new

Comparator<Integer> ( ) {

@Override public int compare (Integer o1, Integer o2) {return

o2.compareTo

(o1); } } );

treeMap.putAll (unsortMap);

for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {

System.out.print (entry.getValue () + “ “);

}

What is the result?

A compilation error occurs.
d b e z j
j z e b d
z b d e j

Correct answer: C

Explanation:

Map treeMap = new TreeMap((Comparator) new Comparator ( ) {@Overridepublic int compare (Integer o1, Integer o2) {return o2.compareTo(o1);}});

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
You expect that unrelated classes would implement your interfaces.
You want to share code among several closely related classes.
You want to declare non-static on non-final fields.
You want to take advantage of multiple inheritance of type.

Correct answer: BE

Explanation:

Reference: https://books.google.com.br/books?id=nS2tBQAAQBAJ&pg=PT235&lpg=PT235&dq=You+want+to+share+code+among+several+closely+related+classes.&source=bl&ots=3oYOu2XXN-&sig=uVFS0KB15BqyEgghXnnjJSUdcrE&hl=pt-BR&sa=X&ved=0ahUKEwjlsKe-n6baAhVEhZAKHeiEDTgQ6AEIMDAB#v=onepage&q=You%20want%20to%20share%20code%20among%20several%20closely%20related%20classes.&f=false

Vendor:	Oracle
Exam Code:	1z0-809
Exam Name:	Java SE 8 Programmer II
Date:	Jun 06, 2021
File Size:	11 MB

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