Download Java SE 8 Programmer II.1z0-809.PracticeTest.2018-08-01.48q.vcex

Vendor: Oracle
Exam Code: 1z0-809
Exam Name: Java SE 8 Programmer II
Date: Aug 01, 2018
File Size: 38 KB
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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?
  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 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? 
  1. 1John2null
  2. 12
  3. A NullPointerException is thrown at run time.
  4. A compilation error occurs.
Correct answer: D
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? 
  1. List<String> fc = Files.list(file);
    fc.stream().forEach (s - > System.out.println(s));
  2. Stream<String> fc = Files.readAllLines (file);
    fc.forEach (s - > System.out.println(s));
  3. List<String> fc = readAllLines(file);
    fc.stream().forEach (s - > System.out.println(s));
  4. Stream<String> fc = Files.lines (file);
    fc.forEach (s - > System.out.println(s));
Correct answer: D
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 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 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); 
  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 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? 
  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 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?
  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 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? 
  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
Question 10
Which action can be used to load a database driver by using JDBC3.0?
  1. Add the driver class to the META-INF/services folder of the JAR file.
  2. Include the JDBC driver class in a jdbc.properties file.
  3. Use the java.lang.Class.forName method to load the driver class.
  4. Use the DriverManager.getDriver method to load the driver class.
Correct answer: C
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