Oracle Oracle Certifications 1Z0-809 Questions & Answers

• Question 61:

  Given the code fragment:

  

  Assume that dbURL, userName, and password are valid.

  Which code fragment can be inserted at line n1 to enable the code to print Connection Established?

  A. Properties prop = new Properties(); prop.put ("user", userName); prop.put ("password", password); con = DriverManager.getConnection (dbURL, prop);

  B. con = DriverManager.getConnection (userName, password, dbURL);

  C. Properties prop = new Properties(); prop.put ("userid", userName); prop.put ("password", password); prop.put("url", dbURL); con = DriverManager.getConnection (prop);

  D. con = DriverManager.getConnection (dbURL); con.setClientInfo ("user", userName); con.setClientInfo ("password", password);

  Correct Answer: A

• Question 62:

  Given the Greetings.properties file, containing:

  

  and given:

  

  What is the result?

  A. Compilation fails.

  B. GOODBY_MSG

  C. Hello, everyone!

  D. Goodbye everyone!

  E. HELLO_MSG

  Correct Answer: A

• Question 63:

  Given: What is the result?

  

  A. Hi Interface-2

  B. A compilation error occurs.

  C. Hi Interface-1

  D. Hi MyClass

  Correct Answer: D

• Question 64:

  Given:

  

  and the code fragment:

  

  Which definition of the ColorSorter class sorts the blocks list?

  

  A. B. C. D.

  Correct Answer: C

• Question 65:

  Given the code fragment:

  

  Which two code fragments, when inserted at line n1 independently, result in the output PEEK: Unix?

  A. .anyMatch ();

  B. .allMatch ();

  C. .findAny ();

  D. .noneMatch ();

  E. .findFirst ();

  Correct Answer: CE

• Question 66:

  Given the code fragments: and

  

  

  Which two modifications enable to sort the elements of the emps list? (Choose two.)

  A. Replace line n1 with class Person extends Comparator

  B. At line n2 insert public int compareTo (Person p) { return this.name.compareTo (p.name); }

  C. Replace line n1 with class Person implements Comparable

  D. At line n2 insert public int compare (Person p1, Person p2) { return p1.name.compareTo (p2.name); }

  E. At line n2 insert: public int compareTo (Person p, Person p2) { return p1.name.compareTo (p2.name); }

  F. Replace line n1 with class Person implements Comparator

  Correct Answer: BC

• Question 67:

  Given:

  

  and the code fragment: What is the result?

  

  A. 0.0

  B. 1500.0

  C. A compilation error occurs.

  D. 2000.0

  Correct Answer: B

• Question 68:

  Given the definition of the Book class:

  

  Which statement is true about the Book class?

  A. It demonstrates encapsulation.

  B. It is defined using the factory design pattern.

  C. It is defined using the singleton design pattern.

  D. It demonstrates polymorphism.

  E. It is an immutable class.

  Correct Answer: A

• Question 69:

  Given the code fragment:

  

  You have been asked to define the ProductCode class. The definition of the ProductCode class must allow c1 instantiation to succeed and cause a compilation error on c2 instantiation.

  Which definition of ProductCode meets the requirement?

  A.

  B.

  

  

  C. D.

  Correct Answer: B

• Question 70:

  Given the code fragment:

  

  Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;? {System.out.print (i + "," + j+ "; ");};

  A. BiConsumer c = (i, j) ->

  B. BiFunction c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};

  C. BiConsumer c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};

  D. BiConsumer c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ");};

  Correct Answer: B

  Reference: https://www.concretepage.com/java/jdk-8/java-8-biconsumer-bifunction-bipredicate-example