Oracle 1Z0-810 Certification Sample Questions and Answers

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Oracle 1Z0-810 Sample Questions:

01. Assuming / is the root directory, which of the following are true statements?
a) /home/parrot is an absolute path.
b) /home/parrot is a directory.
c) /home/parrot is a relative path.
d) The path pointed to from a File object must exist.
e) The parent of the path pointed to by a File object must exist.
02. How do you change the value of an instance variable in an immutable class?
a) Call the setter method.
b) Remove the final modifier and set the instance variable directly.
c) Use a method other than Option A or B.
d) You can’t.
03. What best describes a reduction?
a) An intermediate operation where it filters the stream it receives
b) An intermediate operation where it mathematically divides each element in the stream
c) A terminal operation where a single value is generated by reading each element in the prior step in a stream pipeline
d) A terminal operation where one element is returned from the prior step in a stream pipeline without reading all the elements
04. When localizing an application, which type of data varies in presentation depending on locale?
a) Currencies
b) Dates
c) Both
d) Neither
05. Which of the following are stored in a Period object?
a) Year
b) Month
c) Day
d) Hour
e) Minute
f) Second
06. Choose the class that is least likely to be marked Serializable.
a) A class that holds data about the amount of rain that has fallen in a given year
b) A class that manages the memory of running processes in an application
c) A class that stores information about apples in an orchard
d) A class that tracks the amount of candy in a gumball machine
07. In a stream pipeline, which can return a value other than a Stream?
a) Source
b) Intermediate operation
c) Terminal operation
d) None of the above
08. What technique allows multiple variables from the same class to be shared across all instances of a class?
a) Encapsulation
b) Immutability
c) Singleton
d) Static
09. Which functional interface takes a double value and has a test() method?
a) DoubleConsumer
b) DoublePredicate
c) DoubleUnaryOperator
d) ToDoubleFunction
10. Which of the following statements about inheritance and object composition are correct?
a) Inheritance supports access to protected variables.
b) Object composition tends to promote greater code reuse than inheritance.
c) Inheritance relies on the has‐a principle.
d) Object composition supports method overriding at runtime.
e) Object composition requires a class variable to be declared public or accessible from a public method to be used by a class in a different package.
f) Object composition is always preferred to inheritance.


Question: 01

Answer: a 

Question: 02

Answer: d

Question: 03

Answer: c

Question: 04

Answer: c

Question: 05

Answer: a, b, c

Question: 06

Answer: b

Question: 07

Answer: c

Question: 08

Answer: d

Question: 09

Answer: b

Question: 10

Answer: a, b, e

Rating: 4.8 / 5 (27 votes)