Download Java SE 8 Programmer II.PracticeTest.1z0-809.2018-08-01.1e.48q.vcex


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Exam Java SE 8 Programmer II
Number 1z0-809
File Name Java SE 8 Programmer II.PracticeTest.1z0-809.2018-08-01.1e.48q.vcex
Size 38 Kb
Posted August 01, 2018
Downloads 97



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Demo Questions

Question 1
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?

  • A: Foo<String, Integer> mark = new Foo<String, Integer> (“Steve”, 100);); 
  • B: Foo<String, String> pair = Foo.<String>twice (“Hello World!”);
  • C: Foo percentage = new Foo(97, 32);
  • D: Foo<String, String> grade = new Foo <> (“John”, “A”);



Question 2
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 3
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 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?

  • 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 5
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?

  • A: Comment the lines 28, 29 and 30.
  • B: Replace line 26 with: 
        } catch (Exception | ArithmeticException | NumberFormatException e) {
  • C: Replace line 26 with: 
        } catch (ArithmeticException | NumberFormatException e) {
  • D: Replace line 27 with: 
        throw e;



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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