Oracle Oracle Certifications 1Z0-809 Questions & Answers

• Question 51:

  Given the code fragments: and

  

  

  What is the result?

  A. Video played.Game played.

  B. A compilation error occurs.

  C. class java.lang.Exception

  D. class java.io.IOException

  Correct Answer: C

• Question 52:

  What is true about the java.sql.Statement interface?

  A. It provides a session with the database.

  B. It is used to get an instance of a Connection object by using JDBC drivers.

  C. It provides a cursor to fetch the resulting data.

  D. It provides a class for executing SQL statements and returning the results.

  Correct Answer: D

  Reference: https://docs.oracle.com/cd/E13222_01/wls/docs45/classdocs/java.sql.Statement.html

• Question 53:

  Given that data.txt and alldata.txt are accessible, and the code fragment: What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?

  

  A. br.close();

  B. bw.writeln();

  C. br.flush();

  D. bw.flush();

  Correct Answer: D

• Question 54:

  Given:

  

  and the code fragment:

  

  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: D

  

• Question 55:

  Given: From what threading problem does the program suffer?

  

  A. race condition

  B. deadlock

  C. starvation

  D. livelock

  Correct Answer: B

• Question 56:

  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.

  Correct Answer: AC

  Reference: https://www.logicbig.com/tutorials/core-java-tutorial/java-multi-threading/fork-and-join.html

• Question 57:

  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 method's object when entering that method.

  E. Threads cannot acquire intrinsic locks on classes.

  Correct Answer: AB

  Reference: https://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html

• Question 58:

  Given the code fragments:

  

  and

  

  What is the result?

  A. null B. A compilation error occurs.

  C. DogCatMouse

  D. [Dog, Cat, Mouse]

  Correct Answer: D

• Question 59:

  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]

  and the program prints:

  114 : John : [email protected]

  C. The STUDENT table is updated with the record:

  113 : Jannet : [email protected]

  and the program prints:

  113 : Jannet : [email protected]

  D. A SQLException is thrown at run time.

  Correct Answer: D

• Question 60:

  Given the code fragment:

  

  Which code fragment, when inserted at line 7, enables printing 100?

  A. Function funRef = e –andgt; e + 10; Integer result = funRef.apply(value);

  B. IntFunction funRef = e –andgt; e + 10; Integer result = funRef.apply (10);

  C. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.applyAsInt (value);

  D. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.apply (value);

  Correct Answer: A