Download Java SE 8 Programmer II.Braindumps.1z0-809.2019-08-12.1e.96q.vcex


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Exam Java SE 8 Programmer II
Number 1z0-809
File Name Java SE 8 Programmer II.Braindumps.1z0-809.2019-08-12.1e.96q.vcex
Size 3.74 Mb
Posted August 12, 2019
Downloads 120



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Demo Questions

Question 1
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 2
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 3
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? 

  • A: 1John2null
  • B: 12
  • C: A NullPointerException is thrown at run time.
  • D: A compilation error occurs.



Question 4
Given the code fragment:
Path file = Paths.get (“courses.txt”); 
// line n1 
Assume the courses.txt is accessible. 
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file? 

  • A: List<String> fc = Files.list(file);
    fc.stream().forEach (s - > System.out.println(s));
  • B: Stream<String> fc = Files.readAllLines (file);
    fc.forEach (s - > System.out.println(s));
  • C: List<String> fc = readAllLines(file);
    fc.stream().forEach (s - > System.out.println(s));
  • D: Stream<String> fc = Files.lines (file);
    fc.forEach (s - > System.out.println(s));



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 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); 

  • A: {EUROPE = [Italy, Germany], ASIA = [Japan]}
  • B: {ASIA = [Japan], EUROPE = [Italy, Germany]}
  • C: {EUROPE = [Germany, Italy], ASIA = [Japan]}
  • D: {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}



Question 7
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 8
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 9
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? 

  • A: Good day!
         Test
         followed by an Exception stack trace
  • B: Good day!
         followed by an Exception stack trace
  • C: Good day!
         Test
         null
  • D: A compilation error occurs at line n1.



Question 10
Which action can be used to load a database driver by using JDBC3.0?

  • A: Add the driver class to the META-INF/services folder of the JAR file.
  • B: Include the JDBC driver class in a jdbc.properties file.
  • C: Use the java.lang.Class.forName method to load the driver class.
  • D: Use the DriverManager.getDriver method to load the driver class.








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