Download Java SE 8 Programmer II.dump4pass.1Z0-809.2021-06-06.1e.207q.vcex


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Exam Java SE 8 Programmer II
Number 1z0-809
File Name Java SE 8 Programmer II.dump4pass.1Z0-809.2021-06-06.1e.207q.vcex
Size 8.46 Mb
Posted June 06, 2021
Downloads 5



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Demo Questions

Question 1
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?

  • A: Velocity with new speed
  • B: A compilation error occurs at line n1.
  • C: A compilation error occurs at line n2.
  • D: A compilation error occurs at line n3.



Question 2
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?

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



Question 3
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?

  • A: 246
  • B: The code produces no output.
  • C: A compilation error occurs at line n1.
  • D: A compilation error occurs at line n2.



Question 4
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: A compilation error occurs. 
  • B: d b e z j
  • C: j z e b d
  • D: z b d e j



Question 5
Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

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



Question 6
Given:
public class Counter  { 
    public static void main (String[ ] args) { 
        int a = 10; 
        int b = -1; 
        assert (b >=1) : “Invalid Denominator”;
        int ɫ = a / b; 
        System.out.println (c); 
    } 

What is the result of running the code with the –ea option?

  • A: -10
  • B: 0
  • C: An AssertionError is thrown.
  • D: A compilation error occurs.



Question 7
Given:
class Bird  { 
    public void fly ()  {  System.out.print(“Can fly”); } 

class Penguin extends Bird  { 
    public void fly ()  {  System.out.print(“Cannot fly”); } 

and the code fragment:
class Birdie { 
    public static void main (String [ ] args)  { 
        fly( ( ) -> new Bird ( )); 
        fly (Penguin : : new);
    } 
    /* line n1 */ 

Which code fragment, when inserted at line n1, enables the Birdie class to compile? 

  • A: static void fly (Consumer<Bird> bird) {
        bird :: fly ();
      }
  • B: static void fly (Consumer<? extends Bird> bird) {
        bird.accept( ) fly ();
      }
  • C: static void fly (Supplier<Bird> bird) {
        bird.get( ) fly ();
      }
  • D: static void fly (Supplier<? extends Bird> bird) {
    LOST



Question 8
Given:
1. abstract class Shape  { 
2.     Shape ( )   { System.out.println  (“Shape”);     } 
3.     protected void area ( ) { System.out.println  (“Shape”);     } 
4. } 
5.  
6. class Square extends Shape  { 
7.     int side; 
8.     Square int side { 
9.        /* insert code here */ 
10.         this.side = side; 
11.     } 
12.     public void area ( ) { System.out.println  (“Square”);     } 
13.     } 
14. class Rectangle extends Square { 
15.     int len, br; 
16.     Rectangle (int x, int y)   { 
17.         /* insert code here */ 
18.         len = x, br = y; 
19.     } 
20. void area ( ) { System.out.println  (“Rectangle”);     } 
21. } 
Which two modifications enable the code to compile? (Choose two.)

  • A: At line 1, remove abstract
  • B: At line 9, insert super ( );
  • C: At line 12, remove public
  • D: At line 17, insert super (x);
  • E: At line 17, insert super (); super.side = x;
  • F: At line 20, use public void area ( ) {



Question 9
Given:
class Sum extends RecursiveAction   {                 //line n1 
    static final int THRESHOLD_SIZE  = 3; 
    int stIndex, lstIndex; 
    int [ ] data; 
    public Sum (int [ ]data, int start, int end)   { 
        this.data = data; 
        this stIndex = start; 
        this. lstIndex = end; 
    } 
    protected void compute ( )    { 
        int sum = 0; 
        if (lstIndex – stIndex <= THRESHOLD_SIZE)  { 
            for (int i = stIndex; i < lstIndex; i++)   { 
                sum += data [i]; 
            } 
            System.out.println(sum); 
        } else { 
            new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( ); 
            new Sum (data, stIndex, 
                    Math.min  (lstIndex, stIndex + THRESHOLD_SIZE) 
                    ).compute (); 
        } 
    } 

and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( ); 
int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} 
fjPool.invoke (new Sum (data, 0, data.length)); 
and given that the sum of all integers from 1 to 10 is 55. 
Which statement is true? 

  • A: The program prints several values that total 55.
  • B: The program prints 55.
  • C: A compilation error occurs at line n1.
  • D: The program prints several values whose sum exceeds 55.



Question 10
Given the content of Operator.java, EngineOperator.java, and Engine.java files:

   

and the code fragment:

  
 
What is the result?

  • A: The Engine.java file fails to compile.
  • B: The EngineOperator.java file fails to compile.
  • C: The Operator.java file fails to compile. 
  • D: ON OFF








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