Oracle 1Z0-809 Online Practice Questions and Exam Preparation

Oracle 1Z0-809 Online Questions & Answers

• Question 81:

  Which statement is true about the DriverManager class?

  A. It returns an instance of Connection.
  B. it executes SQL statements against the database.
  C. It only queries metadata of the database.
  D. it is written by different vendors for their specific database.
  A. It returns an instance of Connection.

• Question 82:

  Given:

  

  and the code fragment:

  

  What is the result?

  B. A compilation error occurs at line n1.
  C. An Exception is thrown at run time.
  D. 2
  B. A compilation error occurs at line n1.

• Question 83:

  Given the content:

  

  and given the code fragment:

  

  Which two code fragments, when inserted at line 1 independently, enable the code to print "Wie geht's?"

  A. currentLocale = new Locale ("de", "DE");
  B. currentLocale = new Locale.Builder ().setLanguage ("de").setRegion ("DE").build();
  C. currentLocale = Locale.GERMAN;
  D. currentlocale = new Locale(); currentLocale.setLanguage ("de"); currentLocale.setRegion ("DE");
  E. currentLocale = Locale.getInstance(Locale.GERMAN,Locale.GERMANY);
  B. currentLocale = new Locale.Builder ().setLanguage ("de").setRegion ("DE").build();
  D. currentlocale = new Locale(); currentLocale.setLanguage ("de"); currentLocale.setRegion ("DE");

• Question 84:

  Given the definition of the Vehicle class:

  

  Which action encapsulates the Vehicle class?

  A. Make the Vehicle class private.
  B. Make the name variable public.
  C. Make the getName() and setName() method public.
  D. Make the name variable private.
  E. Make the getName() and setName() method private.
  B. Make the name variable public.

• Question 85:

  Given the code fragments:

  

  and

  

  What is the result?

  A. null
  B. A compilation error occurs.
  C. DogCatMouse
  D. [Dog, Cat, Mouse]
  D. [Dog, Cat, Mouse]

• Question 86:

  Given the code fragment:

  List empDetails = Arrays.asList("100, Robin, HR", "200, Mary, AdminServices","101, Peter, HR"); empDetails.stream()

  .filter(s-> s.contains("r"))

  .sorted()

  .forEach(System.out::println); //line n1

  What is the result?

  A. 100, Robin, HR 101, Peter, HR
  B. E. A compilation error occurs at line n1.
  C. 101, Peter, HR 200, Mary, AdminServices
  D. 100, Robin, HR 200, Mary, AdminServices 101, Peter, HR
  D. 100, Robin, HR 200, Mary, AdminServices 101, Peter, HR

• Question 87:

  Given the code fragments:

  class Caller implements Callable {

  String str;

  public Caller (String s) {this.str=s;}

  public String call()throws Exception { return str.concat ("Caller");}

  }

  class Runner implements Runnable {

  String str;

  public Runner (String s) {this.str=s;}

  public void run () { System.out.println (str.concat ("Runner"));}

  }

  and

  public static void main (String[] args) InterruptedException, ExecutionException {

  ExecutorService es = Executors.newFixedThreadPool(2);

  Future f1 = es.submit (new Caller ("Call"));

  Future f2 = es.submit (new Runner ("Run"));

  String str1 = (String) f1.get();

  String str2 = (String) f2.get(); //line n1

  System.out.println(str1+ ":" + str2);

  }

  What is the result?

  A. The program prints: Run Runner Call Caller : null And the program does not terminate.
  B. The program terminates after printing: Run Runner Call Caller : Run
  C. A compilation error occurs at line n1.
  D. An Execution is thrown at run time.
  A. The program prints: Run Runner Call Caller : null And the program does not terminate.

• Question 88:

  Given the code fragment:

  List colors = Arrays.asList("red", "green", "yellow");

  Predicate test = n - > {

  System.out.println("Searching...");

  return n.contains("red");

  };

  colors.stream()

  .filter(c -> c.length() >= 3)

  .allMatch(test);

  What is the result?

  A. Searching...
  B. Searching... Searching...
  C. Searching... Searching... Searching...
  D. A compilation error occurs.
  C. Searching... Searching... Searching...

• Question 89:

  Given:

  

  and

  

  Which interface from the java.util.function package should you use to refactor the class Txt?

  A. Consumer
  B. Predicate
  C. Supplier
  D. Function
  C. Supplier

• Question 90:

  Which statement is true about the single abstract method of the java.util.function.Function interface?

  A. It accepts one argument and returns void.
  B. It accepts one argument and returns boolean.
  C. It accepts one argument and always produces a result of the same type as the argument.
  D. It accepts an argument and produces a result of any data type.
  D. It accepts an argument and produces a result of any data type.