Download Java SE 8 Programmer II.1z0-809.NewDumps.2021-06-06.207q.vcex

Vendor: Oracle
Exam Code: 1z0-809
Exam Name: Java SE 8 Programmer II
Date: Jun 06, 2021
File Size: 8 MB
Downloads: 7
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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?
  1. Velocity with new speed
  2. A compilation error occurs at line n1.
  3. A compilation error occurs at line n2.
  4. A compilation error occurs at line n3.
Correct answer: A
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?
  1. Replace line n1 with: 
    IntFunction<UnaryOperator> inFu = x -> y -> x*y;
  2. Replace line n1 with: 
    IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
  3. Replace line n1 with: 
    BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
  4. Replace line n2 with: 
    IntStream newStream = stream.map(inFu.applyAsInt (10));
Correct answer: B
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?
  1. 246
  2. The code produces no output.
  3. A compilation error occurs at line n1.
  4. A compilation error occurs at line n2.
Correct answer: A
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?
  1. A compilation error occurs. 
  2. d b e z j
  3. j z e b d
  4. 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);}});
Map treeMap = new TreeMap((Comparator) new Comparator ( ) {@Overridepublic int compare (Integer o1, Integer o2) {return o2.compareTo(o1);}});
Question 5
Which two reasons should you use interfaces instead of abstract classes? (Choose two.)
  1. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
  2. You expect that unrelated classes would implement your interfaces.
  3. You want to share code among several closely related classes.
  4. You want to declare non-static on non-final fields.
  5. 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
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
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?
  1. -10
  2. 0
  3. An AssertionError is thrown.
  4. A compilation error occurs.
Correct answer: A
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? 
  1. static void fly (Consumer<Bird> bird) {
        bird :: fly ();
      }
  2. static void fly (Consumer<? extends Bird> bird) {
        bird.accept( ) fly ();
      }
  3. static void fly (Supplier<Bird> bird) {
        bird.get( ) fly ();
      }
  4. static void fly (Supplier<? extends Bird> bird) {
    LOST
Correct answer: C
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.)
  1. At line 1, remove abstract
  2. At line 9, insert super ( );
  3. At line 12, remove public
  4. At line 17, insert super (x);
  5. At line 17, insert super (); super.side = x;
  6. At line 20, use public void area ( ) {
Correct answer: DF
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? 
  1. The program prints several values that total 55.
  2. The program prints 55.
  3. A compilation error occurs at line n1.
  4. The program prints several values whose sum exceeds 55.
Correct answer: A
Question 10
Given the content of Operator.java, EngineOperator.java, and Engine.java files:
   
and the code fragment:
  
 
What is the result?
  1. The Engine.java file fails to compile.
  2. The EngineOperator.java file fails to compile.
  3. The Operator.java file fails to compile. 
  4. ON OFF
Correct answer: D
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