Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 151:

  What makes Java dynamic?

  A. At runtime, classes are loaded as needed, and new code modules can be loaded on demand.

  B. The runtime can process machine language sources as well as executables from different language compilers.

  C. The Java compiler uses reflection to test if class methods are supported by resources of a target platform.

  D. The Java compiler preprocesses classes to run on specific target platforms.

  Correct Answer: A

• Question 152:

  Given:

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  F. Option F

  Correct Answer: A

• Question 153:

  Given:

  

  What is the result?

  A. [0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet

  B. [0,0] = Red[1,0] = Black[2,0] = Blue

  C. java.lang.ArrayIndexOutOfBoundsException thrown

  D. [0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet

  Correct Answer: D

  

• Question 154:

  Given: What action ensures successful compilation?

  

  A. Replace public Color(int c) with private Color(int c).

  B. Replace int c; with private int c;.

  C. Replace int c; with private final int c;.

  D. Replace enum Color implements Serializable with public enum Color.

  E. Replace enum Color with public enum Color.

  Correct Answer: A

  

• Question 155:

  Given the formula to calculate a monthly mortgage payment:

  

  and these declarations:

  

  How can you code the formula?

  A. m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));

  B. m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));

  C. m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;

  D. m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);

  Correct Answer: A

• Question 156:

  Given:

  

  What is the result?

  A. 1.99,2.99,0

  B. 1.99,2.99,0.0

  C. The compilation fails.

  D. 1.99,2.99

  Correct Answer: C

• Question 157:

  Given:

  

  Which is true?

  A. The compilation fails due to an error in line 6.

  B. The compilation succeeds.

  C. The compilation fails due to an error in line 4.

  D. The compilation fails due to an error in line 10.

  E. The compilation fails due to an error in line 7.

  F. The compilation fails due to an error in line 9.

  G. The compilation fails due to an error in line 2.

  Correct Answer: A

• Question 158:

  Given:

  

  and omitting the throws FooException clause results in a compilation error. Which statement is true about FooException?

  A. FooException is a subclass of RuntimeError.

  B. FooException is unchecked.

  C. The body of foo can only throw FooException.

  D. The body of foo can throw FooException or one of its subclasses.

  Correct Answer: D

  Reference: https://stackoverflow.com/questions/47871728/throwing-a-parent-class-exception-force-to-throw-its-sub-class-exception-event-t

• Question 159:

  Given:

  

  What is the result?

  A. Mr. Green

  B. Green

  C. An exception is thrown at runtime.

  D. Mr. Blue

  Correct Answer: B

• Question 160:

  Given:

  

  What is the output?

  A. 1 2 [1, 2, 3, four] 3 four

  B. 1 2 [1, 2, 3, 4] 3 4

  C. 1 2 [1, 2, 3, 4] 3 four

  D. 1 2 [1, 2, 3, four] 3 4

  Correct Answer: D

  D is right because Main thread will also print data and r thread is also print data and those data will be different from each other.