Oracle Oracle Database 1Z0-808 Questions & Answers

• Question 11:

  Given the code fragment:

  

  Which code snippet at line 9 prints true?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

  

• Question 12:

  Given:

  

  Which two code fragments can be inserted at line n1?

  A. String str = "Java";

  B. for(int iVal = 0; iVal <=5; iVal++){}

  C. Test() {}

  D. package p1;

  E. import java.io.*;

  Correct Answer: AC

• Question 13:

  Examine the content of App.java:

  

  Which is true?

  A. The App.class file is stored within the p1 folder. The Test.class file is stored within the p2 sub-folder of p1.

  B. The App class is accessible within the Test class without an import statement.

  C. import p1.App; is used to access the App class within the Test class.

  D. It is optional to have the package statement as the first line of class definitions.

  Correct Answer: C

• Question 14:

  Given:

  

  What is the result?

  A. 0:0 100:0

  B. null:0

  100:0

  C. 0:0

  100:200

  D. null:null 100:null

  Correct Answer: A

  

• Question 15:

  Given: What is the result?

  

  A. null:null:0.0

  B. null:null

  C. <>:0.0

  D. null:0.0

  Correct Answer: D

  

• Question 16:

  Which two array initialization statements are valid? (Choose two.)

  A. int array[] = new int[3] {1, 2, 3};

  B. int array[] = new int[3]; array[0] = 1; array[1] = 2; array[2] = 3;

  C. int array[3] = new int[] {1, 2, 3};

  D. int array[] = new int[3]; array = {1, 2, 3};

  E. int array[] = new int[] {1,2,3};

  Correct Answer: BE

  Reference: https://stackoverflow.com/questions/1200621/how-do-i-declare-and-initialize-an-array-in-java

• Question 17:

  Given the class definitions:

  class C1 {}

  class C2 extends C1 {}

  class C3 extends C2 {}

  and the code fragment:

  16.

  C1 obj1 = (C1) new C2();

  17.

  C2 obj2 = (C2) new C3();

  18.

  C2 obj3 = (C2) new C1();

  19.

  C3 obj4 = (C3) obj2;

  Which line throws ClassCastException?

  A. line 18

  B. line 17

  C. line 19

  D. line 16

  Correct Answer: A

  C1 cannot access the methods of class C2 because the superclass cannot inherit the methods of the child class.

• Question 18:

  Which two features can be implemented in a Java application by encapsulating the entity classes used? (Choose two.)

  A. data validation

  B. compile time polymorphism

  C. data hiding

  D. data abstraction

  E. data memory optimization

  Correct Answer: CD

  Reference: https://www.geeksforgeeks.org/encapsulation-in-java/

• Question 19:

  Given the code fragment:

  

  What is the result?

  A. The sum of 4 numbers is: 10

  B. A compile time error occurs.

  C. The sum of 5 numbers is: 10

  D. The sum of 5 numbers is: 15

  Correct Answer: B

  

• Question 20:

  Given the code fragment:

  

  What is the result?

  A. [JavaForum, ExpertForum]

  B. [JavaGroup, ExpertGroup]

  C. [JavaForumGroup, ExpertForumGroup]

  D. [JavaGroup, TechGroup ExpertGroup]

  Correct Answer: B