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Home Oracle 1z0-808

Oracle 1z0-808 Exam Practice Questions (P. 1)

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Question #1
Given:

What is the result?
  1. A
    200.0 : 100.0
  2. B
    400.0 : 200.0
  3. C
    400.0 : 100.0
  4. D
    Compilation fails.

Correct Answer:
C

Question #2
Which statement is true about the switch statement?
  1. A
    It must contain the default section.
  2. B
    The break statement, at the end of each case block, is optional.
  3. C
    Its case label literals can be changed at runtime.
  4. D
    Its expression must evaluate to a collection of values.

Correct Answer:
B
chatbot-img GPT-4o - Answer
The correct option is B: the break statement is indeed optional in a switch-case block. Not using a break can sometimes be strategic for a technique known as "fall-through", where execution continues from one case to the next intentionally. This can be useful, for example, in grouped case scenarios without repetitive code.

Question #3
Given the code fragment:

What is the result?
  1. A
    May 04, 2014T00:00:00.000
  2. B
    2014-05-04T00:00: 00.000
  3. C
    5/4/14T00:00:00.000
  4. D
    An exception is thrown at runtime.

Correct Answer:
B

Question #4
Given the code fragment:

What is the result?
  1. A
    Sum is 600
  2. B
    Compilation fails at line n1.
  3. C
    Compilation fails at line n2.
  4. D
    A ClassCastException is thrown at line n1.
  5. E
    A ClassCastException is thrown at line n2.

Correct Answer:
C

Question #5
What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
  1. A
    Encapsulation
  2. B
    Inheritance
  3. C
    Abstraction
  4. D
    Instantiation
  5. E
    Polymorphism

Correct Answer:
A
Using the private modifier is the main way that an object encapsulates itself and hide data from the outside world.
Reference:
http://www.tutorialspoint.com/java/java_access_modifiers.htm

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