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Home Oracle 1z0-803

Oracle 1z0-803 Exam Practice Questions (P. 4)

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Question #16
Given the code fragment:
int a = 0;
a++;
System.out.printIn(a++);
System.out.printIn(a);
What is the result?
  1. A
    1
  2. B
    0
  3. C
    1
  4. D
    2

Correct Answer:
A
The first println prints variable a with value 1 and then increases the variable to 2.

Question #17
Given:

What is the result?
  1. A
    There is no output
  2. B
    d is output
  3. C
    A StringIndexOutOfBoundsException is thrown at runtime
  4. D
    An ArrayIndexOutOfBoundsException is thrown at runtime
  5. E
    A NullPointException is thrown at runtime
  6. F
    A StringArrayIndexOutOfBoundsException is thrown at runtime

Correct Answer:
C
There are only 11 characters in the string "Hello World". The code the String.charAt(11) retrieves the 12th character, which does not exist. A
StringIndexOutOfBoundsException is thrown.
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 11

Question #18
Given a java source file:

What changes will make this code compile? (Select Two)
  1. A
    Adding the public modifier to the declaration of class x
  2. B
    Adding the protected modifier to the x() constructor
  3. C
    Changing the private modifier on the declaration of the one() method to protected
  4. D
    Removing the Y () constructor
  5. E
    Removing the private modifier from the two () method

Correct Answer:
CE
Using the private protected, instead of the private modifier, for the declaration of the one() method, would enable the two() method to access the one() method.

Question #19
Given:

What three modifications, made independently, made to class greet, enable the code to compile and run?
  1. A
    line 6 replaced with handy.dandy.keystroke stroke = new KeyStroke ( );
  2. B
    line 6 replaced with handy.*.KeyStroke = new KeyStroke ( );
  3. C
    line 6 replaced with handy.dandy.KeyStroke Stroke = new handy.dandy.KeyStroke();
  4. D
    import handy.*; added before line 1
  5. E
    import handy.dandy.*; added after line 1
  6. F
    import handy.dandy,KeyStroke; added after line 1
  7. G
    import handy.dandy.KeyStroke.typeException(); added before line 1

Correct Answer:
CEF
Three separate solutions:
C: the full class path to the method must be stated (when we have not imported the package)
D: We can import the hold dandy class
F: we can import the specific method

Question #20
Given:

What is the result?
  1. A
    They match They really match
  2. B
    They really match
  3. C
    They match
  4. D
    Nothing Prints
  5. E
    They really match

Correct Answer:
B
The strings are not the same objects so the == comparison fails. See note #1 below.
As the value of the strings are the same equals is true. The equals method compares values for equality.
Note: #1 ==
Compares references, not values. The use of == with object references is generally limited to the following:
Comparing to see if a reference is null.
Comparing two enum values. This works because there is only one object for each enum constant.
You want to know if two references are to the same object.

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