Download Java SE 8 Programmer II.1z0-809.PracticeTest.2019-04-08.62q.vcex

Vendor: Oracle
Exam Code: 1z0-809
Exam Name: Java SE 8 Programmer II
Date: Apr 08, 2019
File Size: 3 MB
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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:
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: C
Question 3
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: A
Question 4
Given the code fragment:
public void recDelete (String dirName) throws IOException   { 
    File [ ] listOfFiles = new File (dirName) .listFiles(); 
    if (listOfFiles ! = null && listOfFiles.length >0)   { 
        for (File aFile : listOfFiles)   {
            if (aFile.isDirectory ())    { 
                recDelete (aFile.getAbsolutePath ()); 
            }    else   { 
                if (aFile.getName ().endsWith (“.class”)) 
                    aFile.delete (); 
            } 
        } 
    } 
} 
Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked. 
What is the result?
  1. The method deletes all the .class files in the Projects directory and its subdirectories.
  2. The method deletes the .class files of the Projects directory only.
  3. The method executes and does not make any changes to the Projects directory.
  4. The method throws an IOException.
Correct answer: A
Question 5
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 6
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 7
Given the code fragment:
public static void main (String [ ] args) throws IOException   { 
    BufferedReader br = new BufferedReader (new InputStremReader (System.in)); 
    System.out.print (“Enter GDP: “);
    //line 1 
} 
Which code fragment, when inserted at line 1, enables the code to read the GDP from the user? 
  1. int GDP = Integer.parseInt (br.readline());
  2. int GDP = br.read();
  3. int GDP = br.nextInt();
  4. int GDP = Integer.parseInt (br.next());
Correct answer: A
Question 8
Given:
class Student    { 
    String course, name, city; 
    public Student (String name, String course, String city)   { 
        this.course = course; this.name = name; this.city = city; 
    } 
    public String toString()    { 
        return course + “:” + name + “:” + city;
    } 
and the code fragment:
List<Student> stds = Arrays.asList( 
    new Student (“Jessy”, “Java ME”, “Chicago”), 
    new Student (“Helen”, “Java EE”, “Houston”), 
    new Student (“Mark”, “Java ME”, “Chicago”)); 
stds.stream() 
    .collect(Collectors.groupingBy(Student::getCourse))
    .forEach(src, res) -> System.out.println(scr)); 
What is the result? 
  1. [Java EE: Helen:Houston]
    [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
  2. Java EE
    Java ME 
  3. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
    [Java EE: Helen:Houston]
  4. A compilation error occurs.
Correct answer: B
Question 9
Given the code fragments:
interface CourseFilter extends Predicate<String>    { 
    public default boolean test (String str)     { 
        return str.equals (“Java”); 
    } 
} 
and 
List<String> strs = Arrays.asList(“Java”, “Java EE”, “Java ME”); 
Predicate<String> cf1 = s - > s.length() > 3; 
Predicate cf2 = new CourseFilter()   {         //line n1 
    public boolean test (String s)  { 
        return s.contains (“Java”); 
    } 
}; 
long c = strs.stream() 
    .filter(cf1) 
    .filter(cf2                        //line n2 
.count(); 
System.out.println(c); 
What is the result?
  1. 2
  2. 3
  3. A compilation error occurs at line n1.
  4. A compilation error occurs at line n2.
Correct answer: B
Question 10
Given:
public class Emp   { 
    String fName; 
    String lName; 
    public Emp (String fn, String ln)  { 
        fName = fn; 
        lName = ln; 
    } 
    public String getfName() { return fName; } 
    public String getlName() { return lName; } 
} 
and the code fragment:
List<Emp> emp = Arrays.asList ( 
    new Emp (“John”, “Smith”), 
    new Emp (“Peter”, “Sam”), 
    new Emp (“Thomas”, “Wale”)); 
emp.stream() 
    //line n1 
    .collect(Collectors.toList()); 
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fName and then ascending order of lName? 
  1. .sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))
  2. .sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))
  3. .map(Emp::getfName).sorted(Comparator.reserveOrder())
  4. .map(Emp::getfName).sorted(Comparator.reserveOrder().map(Emp::getlName).reserved
Correct answer: A
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