Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 1:

  Given:

  class X {}

  class Y { Y ( ) { } }

  class Z { Z (int i ) { } }

  Which class has a default constructor?

  A. X only
  B. Y only
  C. Z only
  D. X and Y
  E. Y and Z
  F. X and Z
  G. X, Y and Z
  A. X only

• Question 2:

  Given:

  

  What is the result?

  A. One
  B. Two
  C. Three
  D. Compilation fails
  C. Three

  ---

  In this scenario the overloading method is called with a double/float value, 4.0. This makes the third overload method to run.

  Note:

  The Java programming language supports overloading methods, and Java can distinguish between methods with different method signatures. This means that methods within a class can have the same name if they have different parameter

  lists. Overloaded methods are differentiated by the number and the type of the arguments passed into the method.

• Question 3:

  Given:

  

  What is the result?

  A. sc: class.Object asc: class.AnotherSampleClass
  B. sc: class.SampleClass asc: class.AnotherSampleClass
  C. sc: class.AnotherSampleClass asc: class.SampleClass
  D. sc: class.AnotherSampleClass asc: class.AnotherSampleClass
  D. sc: class.AnotherSampleClass asc: class.AnotherSampleClass

  ---

  Note: The getClass method Returns the runtime class of an object. That Class object is the object that is locked by static synchronized methods of the represented class.

  Note: Because Java handles objects and arrays by reference, classes and array types are known as reference types.

• Question 4:

  Given:

  

  What three modifications, made independently, made to class greet, enable the code to compile and run?

  A. line 6 replaced with handy.dandy.keystroke stroke = new KeyStroke ( );
  B. line 6 replaced with handy.*.KeyStroke = new KeyStroke ( );
  C. line 6 replaced with handy.dandy.KeyStroke Stroke = new handy.dandy.KeyStroke();
  D. import handy.*; added before line 1
  E. import handy.dandy.*; added after line 1
  F. import handy.dandy,KeyStroke; added after line 1
  G. import handy.dandy.KeyStroke.typeException(); added before line 1
  C. line 6 replaced with handy.dandy.KeyStroke Stroke = new handy.dandy.KeyStroke();
  E. import handy.dandy.*; added after line 1
  F. import handy.dandy,KeyStroke; added after line 1

  ---

  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 5:

  Given:

  

  What is the result?

  A. They match They really match
  B. They really match
  C. They match
  D. Nothing Prints
  E. They really match They really match
  B. They really match

  ---

  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.

• Question 6:

  Given:

  class Cake {

  int model;

  String flavor;

  Cake() {

  model = 0;

  flavor = "Unknown";

  }

  }

  public class Test {

  public static void main(String[] args) {

  Cake c = new Cake();

  bake1(c);

  System.out.println(c.model + " " + c.flavor);

  bake2(c);

  System.out.println(c.model + " " + c.flavor);

  }

  public static Cake bake1(Cake c) {

  A. flavor = "Strawberry";
  B. model = 1200; return c; } public static void bake2(Cake c) { C. flavor = "Chocolate";
  D. model = 1230; return; } } What is the result?
  E. 0 unknown 0 unknown
  F. 1200 Strawberry 1200 Strawberry
  G. 1200 Strawberry 1230 Chocolate
  H. Compilation fails
  C

  ---

  1200 Strawberry 1230 Chocolate

• Question 7:

  Given:

  

  What is the result?

  A. x: 1 y: 2 x: 3 y: 4
  B. x: 0 y: 0 x: 3 y: 4
  C. x: 1 y: 2 x: 0 y: 0
  D. x: 0 y: 0 x: 0 y: 0
  C. x: 1 y: 2 x: 0 y: 0

• Question 8:

  Given: Which three lines will compile and output "right on!"?

  

  A. Line 5
  B. Line 6
  C. Line 7
  D. Line 8
  E. Line 9
  F. Line 10
  C. Line 7
  D. Line 8
  F. Line 10

• Question 9:

  Which two statements are true for a two-dimensional array of primitive data type?

  A. It cannot contain elements of different types.
  B. The length of each dimension must be the same.
  C. At the declaration time, the number of elements of the array in each dimension must be specified.
  D. All methods of the class object may be invoked on the two-dimensional array.
  C. At the declaration time, the number of elements of the array in each dimension must be specified.
  D. All methods of the class object may be invoked on the two-dimensional array.

  ---

  http://stackoverflow.com/questions/12806739/is-an-array-a-primitive-type-or-an-object-or- something-else-entirely

• Question 10:

  Which two are valid declarations of a two-dimensional array?

  A. int [] [] array2D;
  B. int [2] [2] array2D;
  C. int array2D [];
  D. int [] array2D [];
  E. int [] [] array2D [];
  A. int [] [] array2D;
  D. int [] array2D [];

  ---

  int[][] array2D; is the standard convention to declare a 2-dimensional integer array.

  int[] array2D[]; works as well, but it is not recommended.

  Incorrect answers:

  int[2][2] array2D;

  The size of the array cannot be defined this way.

  int array2D[]; is good definition of a one-dimensional array. int[] []array2D[];is good definition of a three-dimensional array.