oracle 1z0-809 practice test
Java SE 8 Programmer II Exam
Last exam update: Dec 14 ,2024
Question 1
Given the structure of the Student table:
Student (id INTEGER, name VARCHAR)
Given the records from the STUDENT table:
Given the code fragment:
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
What is the result?
- A. The program prints Status: true and two records are deleted from the Student table.
- B. The program prints Status: false and two records are deleted from the Student table.
- C. A SQLException is thrown at runtime.
- D. The program prints Status: false but the records from the Student table are not deleted.
Answer:
B
Question 2
Given the code fragment:
Which should be inserted into line n1 to print Average = 2.5?
- A. IntStream str = Stream.of (1, 2, 3, 4);
- B. IntStream str = IntStream.of (1, 2, 3, 4);
- C. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
- D. Stream str = Stream.of (1, 2, 3, 4);
Answer:
C
Question 3
Which two statements are true about synchronization and locks? (Choose two.)
- A. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
- B. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.
- C. A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.
- D. A thread automatically acquires the intrinsic lock on a synchronized methods object when entering that method.
- E. Threads cannot acquire intrinsic locks on classes.
Answer:
A,B
Question 4
Which two statements are true about the Fork/Join Framework? (Choose two.)
- A. The RecursiveTask subclass is used when a task does not need to return a result.
- B. The Fork/Join framework can help you take advantage of multicore hardware.
- C. The Fork/Join framework implements a work-stealing algorithm.
- D. The Fork/Join solution when run on multicore hardware always performs faster than standard sequential solution.
Answer:
A,C
Question 5
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
- A. Function<Integer> funRef = e –> e + 10;Integer result = funRef.apply(value);
- B. IntFunction funRef = e –> e + 10;Integer result = funRef.apply (10);
- C. ToIntFunction<Integer> funRef = e –> e + 10;int result = funRef.applyAsInt (value);
- D. ToIntFunction funRef = e –> e + 10;int result = funRef.apply (value);
Answer:
A
Question 6
Given the records from the STUDENT table:
Given the code fragment:
Assume that the URL, username, and password are valid.
What is the result?
- A. The STUDENT table is not updated and the program prints:114 : John : [email protected]
- B. The STUDENT table is updated with the record:113 : Jannet : [email protected] the program prints:114 : John : [email protected]
- C. The STUDENT table is updated with the record:113 : Jannet : [email protected] the program prints:113 : Jannet : [email protected]
- D. A SQLException is thrown at run time.
Answer:
D
Question 7
Given the code fragments:
and
What is the result?
- A. null
- B. A compilation error occurs.
- C. DogCatMouse
- D. [Dog, Cat, Mouse]
Answer:
D
Question 8
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
Answer:
A
Question 9
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);
Answer:
A
Question 10
Given:
and the code fragment:
What is the result?
- A. 0.0
- B. 1500.0
- C. A compilation error occurs.
- D. 2000.0
Answer:
B
Question 11
Given the code fragments:
and
Which two modifications enable to sort the elements of the emps list? (Choose two.)
- A. Replace line n1 withclass Person extends Comparator<Person>
- B. At line n2 insertpublic int compareTo (Person p) {return this.name.compareTo (p.name);}
- C. Replace line n1 withclass Person implements Comparable<Person>
- D. At line n2 insertpublic 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 withclass Person implements Comparator<Person>
Answer:
B,C
Question 12
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 ();
Answer:
C,E
Question 13
Given:
and the code fragment:
Which definition of the ColorSorter class sorts the blocks list?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer:
C
Question 14
Given:
What is the result?
- A. Hi Interface-2
- B. A compilation error occurs.
- C. Hi Interface-1
- D. Hi MyClass
Answer:
D
Question 15
Given the code fragment:
What is the result?
- A. Word: why what when
- B. Word: why Word: why what Word: why what when
- C. Word: why Word: what Word: when
- D. Compilation fails at line n1.
Answer:
A