Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 71:

  Which statement is true about the default constructor of a top-level class?

  A. It can take arguments.
  B. It has private access modifier in its declaration.
  C. It can be overloaded.
  D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.
  D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.

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  Explanation/Reference:

  In both Java and C#, a "default constructor" refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. The default constructor is also empty, meaning that it does nothing. A programmer- defined constructor that takes no parameters is also called a default constructor.

• Question 72:

  Given the code fragment:

  

  Which two code fragments can be independently inserted at line n1 to enable the code to print the elements of the array in reverse order? (Choose two.)

  

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

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  Explanation/Reference:

• Question 73:

  Given:

  

  How many objects have been created when the line / / do complex stuff is reached?

  A. Two
  B. Three
  C. Four
  D. Six
  C. Four

• Question 74:

  Given: What is the result?

  

  A. A B
  B. A C
  C. C C
  D. A ClassCastException is thrown only at line n1.
  E. A ClassCastException is thrown only at line n2.
  D. A ClassCastException is thrown only at line n1.

• Question 75:

  Given:

  

  The class is poorly encapsulated. You need to change the circle class to compute and return the area instead.

  Which two modifications are necessary to ensure that the class is being properly encapsulated?

  A. Remove the area field.
  B. Change the getArea( ) method as follows: public double getArea ( ) { return Match.PI * radius * radius; }
  C. Add the following method: public double getArea ( ) {area = Match.PI * radius * radius; }
  D. Change the cacess modifier of the SerRadius ( ) method to be protected.
  B. Change the getArea( ) method as follows: public double getArea ( ) { return Match.PI * radius * radius; }
  D. Change the cacess modifier of the SerRadius ( ) method to be protected.

• Question 76:

  Given the following array:

  

  Which two code fragments, independently, print each element in this array?

  

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

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  Explanation/Reference:

  All the remaining options have syntax errors

• Question 77:

  Which statement best describes encapsulation?

  A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
  B. Encapsulation ensures that classes can be designed so that their methods are inheritable.
  C. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
  D. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.
  A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.

• Question 78:

  Given the definitions of the MyString class and the Test class:

  

  What is the result?

  

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

• Question 79:

  int i, j=0;

  i = (3* 2 +4 +5 ) ;

  j = (3 * ((2+4) + 5));

  System.out.println("i:"+ i + "\nj":+j);

  What is the result?

  

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

• Question 80:

  Given the code fragment:

  

  Which code fragment, when inserted at // insert code here, enables the code to compile and and print a b c?

  A. List update (String[] strs)
  B. Static ArrayListupdate(String [] strs)
  C. Static List update (String [] strs)
  D. Static void update (String[] strs)
  E. ArrayList static update(String [] strs)
  E. ArrayList static update(String [] strs)