Download Java SE 8 Programmer II.testinside.1z0-809.2019-05-23.1e.63q.vcex


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Exam Java SE 8 Programmer II
Number 1z0-809
File Name Java SE 8 Programmer II.testinside.1z0-809.2019-05-23.1e.63q.vcex
Size 2.72 Mb
Posted May 23, 2019
Downloads 127



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Demo Questions

Question 1
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 2
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 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?

  • 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 4
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



Question 5
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?

  • A: The method deletes all the .class files in the Projects directory and its subdirectories.
  • B: The method deletes the .class files of the Projects directory only.
  • C: The method executes and does not make any changes to the Projects directory.
  • D: The method throws an IOException.



Question 6
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? 

  • A: {1007 = A, 1002 = C, 1001 = B, 1003 = B}
  • B: {1001 = B, 1002 = C, 1003 = B, 1007 = A} 
  • C: {1002 = C, 1003 = B, 1007 = A}
  • D: {1007 = A, 1001 = B, 1003 = B, 1002 = C}



Question 7
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?

  • A: The program prints true.
  • B: The program prints false.
  • C: A compilation error occurs. To ensure successful compilation, replace line n1 with: 
       boolean equals (Book obj)  {
  • D: A compilation error occurs. To ensure successful compilation, replace line n2 with: 
       System.out.println (b1.equals((Object) b2));



Question 8
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? 

  • A: int GDP = Integer.parseInt (br.readline());
  • B: int GDP = br.read();
  • C: int GDP = br.nextInt();
  • D: int GDP = Integer.parseInt (br.next());



Question 9
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?

  • A: [Java EE: Helen:Houston]
    [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
  • B: Java EE
    Java ME
  • C: [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
    [Java EE: Helen:Houston]
  • D: A compilation error occurs.



Question 10
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?

  • A: 2
  • B: 3
  • C: A compilation error occurs at line n1.
  • D: A compilation error occurs at line n2.








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