Download Java SE 8 Programmer II.1z0-809.PracticeTest.2019-01-29.52q.vcex

Vendor: Oracle
Exam Code: 1z0-809
Exam Name: Java SE 8 Programmer II
Date: Jan 29, 2019
File Size: 49 KB
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Demo Questions

Question 1
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 2
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?
  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 3
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 4
Given:
public class Foo<K, V>   { 
    private K key; 
    private V value; 
public Foo (K key, V value) (this.key = key; this value = value;) 
public static <T> Foo<T, T> twice (T value) (return new Foo<T, T> (value, value); ) 
public K getKey () (return key;) 
public V getValue () (return value;) 
} 
Which option fails?
  1. Foo<String, Integer> mark = new Foo<String, Integer> (“Steve”, 100);); 
  2. Foo<String, String> pair = Foo.<String>twice (“Hello World!”);
  3. Foo percentage = new Foo(97, 32);
  4. Foo<String, String> grade = new Foo <> (“John”, “A”);
Correct answer: C
Question 5
Given the code fragment:
Stream<List<String>> iStr= Stream.of ( 
    Arrays.asList (“1”, “John”), 
    Arrays.asList (“2”, null)0; 
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ()); 
nInSt.forEach (System.out :: print);
What is the result? 
  1. 1John2null
  2. 12
  3. A NullPointerException is thrown at run time.
  4. A compilation error occurs.
Correct answer: D
Question 6
Given the code fragments:
4. void doStuff() throws ArithmeticException, NumberFormatException, Exception   { 
5.     if (Math.random() >-1 throw new Exception (“Try again”); 
6. } 
and 
24. try { 
25.     doStuff ( ):
26. } catch (ArithmeticException | NumberFormatException | Exception e)  { 
27.     System.out.println (e.getMessage()); } 
28. catch (Exception e)    { 
29.     System.out.println (e.getMessage()); } 
30. } 
Which modification enables the code to print Try again?
  1. Comment the lines 28, 29 and 30.
  2. Replace line 26 with: 
        } catch (Exception | ArithmeticException | NumberFormatException e) {
  3. Replace line 26 with: 
        } catch (ArithmeticException | NumberFormatException e) {
  4. Replace line 27 with: 
        throw e;
Correct answer: C
Question 7
Given the definition of the Country class:
public class country { 
    public enum Continent {ASIA, EUROPE} 
    String name; 
    Continent region; 
    public Country (String na, Continent reg)   { 
        name = na, region = reg; 
        } 
        public String getName () {return name;}  
        public Continent getRegion () {return region;} 
} 
and the code fragment:
List<Country> couList = Arrays.asList ( 
    new Country (“Japan”, Country.Continent.ASIA), 
    new Country (“Italy”, Country.Continent.EUROPE), 
    new Country (“Germany”, Country.Continent.EUROPE)); 
Map<Country.Continent, List<String>> regionNames = couList.stream () 
    .collect(Collectors.groupingBy (Country ::getRegion,
    Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames); 
  1. {EUROPE = [Italy, Germany], ASIA = [Japan]}
  2. {ASIA = [Japan], EUROPE = [Italy, Germany]}
  3. {EUROPE = [Germany, Italy], ASIA = [Japan]}
  4. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
Correct answer: B
Question 8
Given the code fragment:
Map<Integer, String> books = new TreeMap<>(); 
books.put (1007, “A”); 
books.put (1002, “C”); 
books.put (1001, “B”); 
books.put (1003, “B”); 
System.out.println (books); 
What is the result? 
  1. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
  2. {1001 = B, 1002 = C, 1003 = B, 1007 = A} 
  3. {1002 = C, 1003 = B, 1007 = A}
  4. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
Correct answer: B
Explanation:
Reference: TreeMap inherits SortedMap and automatically sorts the element's key
Reference: TreeMap inherits SortedMap and automatically sorts the element's key
Question 9
Given:
class Book { 
    int id; 
    String name; 
    public Book (int id, String name)  { 
        this.id = id; 
        this.name = name; 
    } 
    public boolean equals (Object obj) {           //line n1 
        boolean output = false; 
        Book b = (Book) obj; 
        if (this.name.equals(b name))} 
            output = true; 
        } 
        return output; 
    } 
} 
and the code fragment:
Book b1 = new Book (101, “Java Programing”); 
Book b2 = new Book (102, “Java Programing”); 
System.out.println (b1.equals(b2));                 //line n2 
Which statement is true? 
  1. The program prints true.
  2. The program prints false.
  3. A compilation error occurs. To ensure successful compilation, replace line n1 with: 
       boolean equals (Book obj)  {
  4. A compilation error occurs. To ensure successful compilation, replace line n2 with: 
       System.out.println (b1.equals((Object) b2));
Correct answer: A
Question 10
Given the content of /resourses/Message.properties:
welcome1=”Good day!” 
and given the code fragment:
Properties prop = new Properties (); 
FileInputStream fis = new FileInputStream (“/resources/Message.properties”); 
prop.load(fis); 
System.out.println(prop.getProperty(“welcome1”)); 
System.out.println(prop.getProperty(“welcome2”, “Test”));//line n1 
System.out.println(prop.getProperty(“welcome3”)); 
What is the result? 
  1. Good day!
    Test
    followed by an Exception stack trace
  2. Good day!
    followed by an Exception stack trace
  3. Good day!
    Test
    null
  4. A compilation error occurs at line n1.
Correct answer: C
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