Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 61:

  Given:

  

  You want the code to produce this output:

  John

  Joe

  Jane

  Which code fragment should be inserted on line 1 and line 2 to produce the output?

  A. Insert Comparator on line 1. Insert public int compare(Person p1, Person p2) { return p1.name.compare(p2.name); } on line 2.

  B. Insert Comparator on line 1. Insert public int compareTo(Person person) { return person.name.compareTo(this.name); } on line 2.

  C. Insert Comparable on line 1. Insert

  public int compare(Person p1, Person p2) {

  return p1.name.compare(p2.name);

  }

  on line 2.

  D. Insert Comparator on line 1. Insert public int compare(Person person) { return person.name.compare(this.name); } on line 2.

  Correct Answer: B

  Reference: https://www.coursehero.com/file/p320ss6/Override-public-int-compareTo- Person-other-Compare-this-objects-name-to-others/

• Question 62:

  Given:

  

  What is known about the Sportscar class?

  A. The Sportscar class is a subclass of Automobile and inherits its methods.

  B. The Sportscar subclass cannot override setTurbo method from the superclass Automobile.

  C. The Sportscar class is a superclass that has more functionality than the Automobile class.

  D. The Sportscar class inherits the setTurbo method from the superclass Automobile.

  Correct Answer: A

• Question 63:

  Which two interfaces are considered to be functional interfaces? (Choose two.)

  A. @FunctionalInterface interface InterfaceC { public boolean equals(Object o); int breed(int x);

  int calculate(int x, int y);

  }

  B.

  C.

  D.

  E.

  F. @FunctionalInterface interface InterfaceD { int breed(int x); }

  G. @FunctionalInterface interface InterfaceE { public boolean equals(int i); int breed(int x); }

  H. interface InterfaceA { int GERM = 13; public default int getGERM() { return GERM; } }

  I. interface InterfaceB { int GERM = 13; public default int getGERM() { return get(); } private int get() { return GERM; } public boolean equals(Object o); int breed(int x); }

  Correct Answer: BE

• Question 64:

  Given:

  

  Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)

  A. setCCount(c) = cCount;

  B. tCount = tCount;

  C. setGCount(g);

  D. cCount = setCCount(c);

  E. aCount = a;

  Correct Answer: CD

• Question 65:

  Which two statements are true about the modular JDK? (Choose two.)

  A. The foundational APIs of the Java SE Platform are found in the java.base module.

  B. An application must be structured as modules in order to run on the modular JDK.

  C. It is possible but undesirable to configure modules' exports from the command line.

  D. APIs are deprecated more aggressively because the JDK has been modularized.

  Correct Answer: AC

• Question 66:

  Given the contents:

  MessageBundle.properties file:

  message=Hello

  MessageBundle_en.properties file:

  message=Hello (en)

  MessageBundle_US.properties file:

  message=Hello (US)

  MessageBundle_en_US.properties file:

  message=Hello (en_US)

  MessageBundle_fr_FR.properties file:

  message=Bonjour

  and the code fragment:

  Locale.setDefault(Locale.FRANCE);

  Locale currentLocale = new Locale.Builder().setLanguage("en").build(); ResourceBundle messages = ResourceBundle.getBundle("MessageBundle", currentLocale);

  System.out. println(messages.getString("message"));

  Which file will display the content on executing the code fragment?

  A. MessageBundle_en_US.properties

  B. MessageBundle_en.properties

  C. MessageBundle_fr_FR.properties

  D. MessageBundle_US.properties

  E. MessageBundle.properties

  Correct Answer: C

  Reference: https://www.javatpoint.com/ResourceBundle-class

• Question 67:

  Given the code fragment:

  

  What is the result?

  A. 2

  B. -1

  C. 1

  D. -3

  Correct Answer: C

• Question 68:

  Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:

  

  What security measures should be added to this method so that it meets the requirements for a customer accessible method?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

• Question 69:

  Given the code fragment:

  

  What is the result?

  A. 23

  B. 12

  C. 123

  D. 13

  Correct Answer: A

  

• Question 70:

  Given:

  

  Which two lines cause compilation errors? (Choose two.)

  A. line 12

  B. line 6

  C. line 9

  D. line 8

  E. line 7

  Correct Answer: BE