Create Next App

Exam contains 146 questions

Page 4 of 25

Question 19 🔥

Which is a key aspect of composition?

Which database solution meets these requirements?

A. Using inheritance

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B. Method delegation

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C. Creating abstract classes

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D. Implementing the composite interface

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Discussion of the question

Question 20 🔥

Given:What two changes should you make to apply the DAO pattern to this class?

Which database solution meets these requirements?

A. Make the Customer class abstract.

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B. Make the customer class an interface.

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C. Move the add, delete, find, and update methods into their own implementation class.

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D. Create an interface that defines the signatures of the add, delete, find, and update methods.

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E. Make the add, delete, and find, and update methods private for encapsulation.

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F. Make the getName and getID methods private for encapsulation.

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Discussion of the question

Question 21 🔥

Which two are true about Singletons?

Which database solution meets these requirements?

A. A Singleton must implement serializable.

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B. A Singleton has only the default constructor.

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C. A Singleton implements a factory method.

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D. A Singleton improves a class's cohesion.

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E. Singletons can be designed to be thread-safe.

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Discussion of the question

Question 22 🔥

What are two differences between Callable and Runnable?

Which database solution meets these requirements?

A. A Callable can return a value when executing, but a Runnable cannot.

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B. A Callable can be executed by a ExecutorService, but a Runnable cannot.

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C. A Callable can be passed to a Thread, but a Runnable cannot.

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D. A Callable can throw an Exception when executing, but a Runnable cannot.

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Discussion of the question

Question 23 🔥

Which two properly implement a Singleton pattern?

Which database solution meets these requirements?

A. class Singleton { private static Singleton instance; private Singleton () {} public static synchronized Singleton getInstance() { if (instance == null) { instance = new Singleton (); } return instance; } }

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B. class Singleton { private static Singleton instance = new Singleton(); protected Singleton () {} public static Singleton getInstance () { return instance; } }

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C. class Singleton { Singleton () {} private static class SingletonHolder { private static final Singleton INSTANCE = new Singleton (); } public static Singleton getInstance () { return SingletonHolder.INSTANCE; } }

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D. enum Singleton { INSTANCE; }

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Discussion of the question

Question 24 🔥

Given:Which three values will appear in the output?

Which database solution meets these requirements?

Discussion of the question

Ready to Pass Your Certification Test

oracle 1Z0_804

Exam contains 146 questions

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