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Home Oracle 1z0-804

Oracle 1z0-804 Exam Practice Questions (P. 2)

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Question #6
Given:

What two changes, made independently, will enable the code to compile?
  1. A
    Change the signature of Account to: public class Account.
  2. B
    Change the signature of CheckingAccount to: public abstract CheckingAccount
  3. C
    Implement private methods for deposit and withdraw in CheckingAccount.
  4. D
    Implement public methods for deposit and withdraw in CheckingAccount.
  5. E
    Change Signature of checkingAccount to: CheckingAccount implements Account.
  6. F
    Make Account an interface.

Correct Answer:
BD
Compiler say:
- Der Typ CheckingAccount muss die bernommene abstrakte
Methode Account.deposit(double) implementieren
- Der Typ CheckingAccount muss die bernommene abstrakte
Methode Account.withdraw(double) implementieren

ODER -
Typ CheckingAccount als abstract definieren

Question #7
Given:

Which fragment, inserted in the Books interface, enables the code to compile?
  1. A
    public abstract String type; public abstract String getType();
  2. B
    public static String type; public abstract String getType();
  3. C
    public String type = "Fiction"; public static String getType();
  4. D
    public String type = "Fiction"; public abstract String getType();

Correct Answer:
D

Question #8
Given:

What is the result?
  1. A
    Event Quiz
  2. B
    Event Event
  3. C
    Quiz Quiz
  4. D
    Quiz Event
  5. E
    Compilation fails

Correct Answer:
E

Question #9
Which two forms of abstraction can a programmer use in Java?
  1. A
    enums
  2. B
    interfaces
  3. C
    primitives
  4. D
    abstract classes
  5. E
    concrete classes
  6. F
    primitive wrappers

Correct Answer:
BD
When To Use Interfaces -
An interface allows somebody to start from scratch to implement your interface or implement your interface in some other code whose original or primary purpose was quite different from your interface. To them, your interface is only incidental, something that have to add on to the their code to be able to use your package.
The disadvantage is every method in the interface must be public. You might not want to expose everything.
*When To Use Abstract classes
An abstract class, in contrast, provides more structure. It usually defines some default implementations and provides some tools useful for a full implementation.
The catch is, code using it must use your class as the base. That may be highly inconvenient if the other programmers wanting to use your package have already developed their own class hierarchy independently. In Java, a class can inherit from only one base class. *When to Use Both
You can offer the best of both worlds, an interface and an abstract class. Implementors can ignore your abstract class if they choose. The only drawback of doing that is calling methods via their interface name is slightly slower than calling them via their abstract class name.
Reference: http://mindprod.com/jgloss/interfacevsabstract.html

Question #10
Given:

What is the result?
  1. A
    Up Down
  2. B
    Up Up
  3. C
    Up null
  4. D
    Compilation fails
  5. E
    An exception is thrown at runtime

Correct Answer:
D
------
Exception in thread "main" java.lang.ExceptionInInitializerError at garden.Garden.main
Caused by: java.lang.RuntimeException: Uncompilable source code - garden.Plant is not abstract and does not override abstract method growthDirection() in garden.Plant

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