Oracle Oracle Database 1Z0-809 Questions & Answers

• Question 171:

  Given the code fragment:

  List listVal = Arrays.asList("Joe", "Paul", "Alice", "Tom");

  System.out.println (

  // line n1

  );

  Which code fragment, when inserted at line n1, enables the code to print the count of string elements

  whose length is greater than three?

  A. listVal.stream().filter(x -> x.length()>3).count()

  B. listVal.stream().map(x -> x.length()>3).count()

  C. listVal.stream().peek(x -> x.length()>3).count().get()

  D. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count()

  Correct Answer: A

• Question 172:

  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.

  Correct Answer: C

• Question 173:

  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.

  Correct Answer: C

• Question 174:

  Given the code fragment:

  Path p1 = Paths.get("/Pics/MyPic.jpeg"); System.out.println (p1.getNameCount() + ":" + p1.getName(1) + ":" + p1.getFileName());

  Assume that the Pics directory does NOT exist. What is the result?

  A. An exception is thrown at run time.

  B. 2:MyPic.jpeg: MyPic.jpeg

  C. 1:Pics:/Pics/ MyPic.jpeg

  D. 2:Pics: MyPic.jpeg

  Correct Answer: B

• Question 175:

  Given the code fragments:

  class MyThread implements Runnable {

  private static AtomicInteger count = new AtomicInteger (0);

  public void run () {

  int x = count.incrementAndGet();

  System.out.print (x+" ");

  }

  }

  and

  Thread thread1 = new Thread(new MyThread());

  Thread thread2 = new Thread(new MyThread());

  Thread thread3 = new Thread(new MyThread());

  Thread [] ta = {thread1, thread2, thread3};

  for (int x= 0; x < 3; x++) {

  ta[x].start();

  }

  Which statement is true?

  A. The program prints 1 2 3 and the order is unpredictable.

  B. The program prints 1 2 3.

  C. The program prints 1 1 1.

  D. A compilation error occurs.

  Correct Answer: A

• Question 176:

  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());

  Correct Answer: A

• Question 177:

  Given the code fragment:

  Path source = Paths.get ("/data/december/log.txt");

  Path destination = Paths.get("/data"); Files.copy (source, destination);

  and assuming that the file /data/december/log.txt is accessible and contains:

  10-Dec-2014 - Executed successfully

  What is the result?

  A. A file with the name log.txt is created in the /data directory and the content of the /data/december/log.txt file is copied to it.

  B. The program executes successfully and does NOT change the file system.

  C. A FileNotFoundException is thrown at run time.

  D. A FileAlreadyExistsException is thrown at run time.

  Correct Answer: D

• Question 178:

  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 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.

  Correct Answer: B

• Question 179:

  Given the code fragments:

  interface CourseFilter extends Predicate {

  public default boolean test (String str) {

  return str.equals ("Java");

  }

  }

  and

  List strs = Arrays.asList("Java", "Java EE", "Java ME");

  Predicate 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.

  Correct Answer: B

• Question 180:

  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 = 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?

  A. .sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))

  B. .sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))

  C. .map(Emp::getfName).sorted(Comparator.reserveOrder())

  D. .map(Emp::getfName).sorted(Comparator.reserveOrder().map(Emp::getlName).reserved

  Correct Answer: B