Oracle 1Z0-815 Online Practice Questions and Exam Preparation

Oracle 1Z0-815 Online Questions & Answers

• Question 31:

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

• Question 32:

  Given:

  

  Assuming that this code compiles correctly, which three statements are true? (Choose three.)

  A. B cannot be abstract.
  B. B is a subtype of A.
  C. A cannot be abstract.
  D. A cannot be final.
  E. B cannot be final.
  F. A is a subtype of B.
  A. B cannot be abstract.
  D. A cannot be final.
  F. A is a subtype of B.

• Question 33:

  Given:

  

  What is the output?

  A. I am an object array
  B. The compilation fails due to an error in line 1.
  C. I am an array
  D. I am an object
  B. The compilation fails due to an error in line 1.

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• Question 34:

  Given:

  

  Which two changes need to be made to make this class compile? (Choose two.)

  A. Change Line 1 to an abstract class: public abstract class API {
  B. Change Line 2 access modifier to protected: protected void checkValue(Object value) throws IllegalArgumentException;
  C. Change Line 1 to a class: public class API {
  D. Change Line 1 to extend java.lang.AutoCloseable: public interface API extends AutoCloseable {
  E. Change Line 2 to an abstract method: public abstract void checkValue(Object value) throws IllegalArgumentException;
  C. Change Line 1 to a class: public class API {
  E. Change Line 2 to an abstract method: public abstract void checkValue(Object value) throws IllegalArgumentException;

• Question 35:

  Which describes an aspect of Java that contributes to high performance?

  A. Java prioritizes garbage collection.
  B. Java has a library of built-in functions that can be used to enable pipeline burst execution.
  C. Java monitors and optimizes code that is frequently executed.
  D. Java automatically parallelizes code execution.
  A. Java prioritizes garbage collection.

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  Reference: https://dzone.com/articles/how-to-tune-garbage-collection-in-java

• Question 36:

  Which three initialization statements are correct? (Choose three.)

  A. int x = 12_34;
  B. short sh = (short)`A';
  C. String contact# = "(+2) (999) (232)";
  D. boolean true = (4 == 4);
  E. float x = 1.99;
  F. int[][] e = {{1,1},{2,2}};
  G. byte b = 10; char c = b;
  A. int x = 12_34;
  E. float x = 1.99;
  F. int[][] e = {{1,1},{2,2}};

• Question 37:

  Given:

  

  Which two constructors will compile and set the class field strings? (Choose two.)

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  A. Option A
  E. Option E

• Question 38:

  Given:

  

  Which expression when added at line 1 will produce the output of 1.17?

  A. float z = (float)(Math.round((float)x/y*100)/100);
  B. float z = Math.round((int)(x/y),2);
  C. float z = Math.round((float)x/y,2);
  D. float z = Math.round((float)x/y*100)/(float)100;
  D. float z = Math.round((float)x/y*100)/(float)100;

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• Question 39:

  Given:

  

  Which three are true? (Choose three.)

  A. b1.foo(c) prints Bonjour le monde!
  B. f1.foo(c) prints Hello world!
  C. f1.foo(c) prints Ol?Mundo!
  D. b1.foo(c) prints Hello world!
  E. f2.foo(c) prints Ol?Mundo!
  F. b1.foo(c) prints Ol?Mundo!
  G. f2.foo(c) prints Bonjour le monde!
  H. f2.foo(c) prints Hello world!
  I. f1.foo(c) prints Bonjour le monde!
  B. f1.foo(c) prints Hello world!
  F. b1.foo(c) prints Ol?Mundo!
  G. f2.foo(c) prints Bonjour le monde!

• Question 40:

  Given:

  

  executed using this command: java Myclass My Car is red What is the output of this class?

  A. Car--red--My
  B. My--Car--is
  C. My--is--java
  D. java--Myclass--My
  E. Myclass--Car--red
  B. My--Car--is