Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 141:

  Which of the following exception will be thrown due to the statement given here?

  int array[] = new int[-2];

  A. NullPointerException
  B. NegativeArraySizeException
  C. ArrayIndexOutOfBoundsException
  D. IndexOutOfBoundsException
  E. This statement does not cause any exception.
  B. NegativeArraySizeException

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  Explanation/Reference:

  In given statement we can see that, we have passed negative value for creating int array, which results a NegativeArraySize Except ion. Hence option B is correct. Option A is incorrect as it is thrown when an application attempts to use null in a case where an object is required. Option D is incorrect as IndexOutOfBoundsException thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range. REFERENCE rhttpy/docs.oracle.com/iavase/S/docs/api/java/lang/NegativeArraySizeException.html

• Question 142:

  Given the code fragment:

  

  and the requirements of the application:

  1.

  It must display the menu.

  2.

  It must print the option selected.

  3.

  It must continue its execution till it reads `0'.

  Which code fragment can be used to meet the requirements?

  

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

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  Explanation/Reference:

  The correct answer is the C

  A -> Need to display the menu, the code doesn't have that. Besides, you can't read the variables in the increment of a for, if you want, it has to be done inside it.

  B -> Wrong, the menu must be shown, if the input is 0 the menu is not even displayed and the application is terminated.

  C -> It is correct, the menu appears and the data is read, if it is different from 0, the code continues.

  D -> Wrong, while boolean expression accepts 0 as an answer to continue.

• Question 143:

  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.
  E. A ClassCastException is thrown only at line n2.

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  Explanation/Reference:

• Question 144:

  Given the class definitions:

  

  And the code fragment of the main() method,

  

  What is the result?

  A. Java Java Java
  B. Java Jeve va
  C. Java Jeve ve
  D. Compilation fails
  D. Compilation fails

• Question 145:

  Given the code fragment:

  

  What is the result?

  A. 2 4
  B. 0 2 4 6
  C. 0 2 4
  D. Compilation fails.
  B. 0 2 4 6

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  Explanation/Reference:

  

• Question 146:

  Given:

  class Sports {

  int num_players;

  String name, ground_condition;

  Sports(int np, String sname, String sground){

  num_players = np;

  name = sname;

  ground_condition = sground;

  }

  }

  class Cricket extends Sports {

  int num_umpires;

  int num_substitutes;

  Which code fragment can be inserted at line //insert code here to enable the code to compile?

  A. Cricket() { super(11, "Cricket", "Condidtion OK"); num_umpires =3; num_substitutes=2; }
  B. Cricket() { super.ground_condition = "Condition OK"; super.name="Cricket"; super.num_players = 11; num_umpires =3; num_substitutes=2; }
  C. Cricket() { this(3,2); super(11, "Cricket", "Condidtion OK"); } Cricket(int nu, ns) { this.num_umpires =nu; this.num_substitutes=ns; }
  D. Cricket() { this.num_umpires =3; this.num_substitutes=2; super(11, "Cricket", "Condidtion OK"); }
  A. Cricket() { super(11, "Cricket", "Condidtion OK"); num_umpires =3; num_substitutes=2; }

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  Explanation/Reference:

  Incorrect:

  not C, not D: call to super must be the first statement in constructor.

• Question 147:

  Give: What is the result?

  

  A. 1525
  B. 13
  C. Compilation fails
  D. An exception is thrown at runtime
  E. The program fails to execute due to runtime error
  D. An exception is thrown at runtime

• Question 148:

  Given the code fragment:

  

  What is the result?

  A. Invalid Name
  B. Invalid Name omas
  C. Invalid Name omas null null
  D. omas ter seph
  C. Invalid Name omas null null

• Question 149:

  Given:

  import java.util.*;

  public class Ref {

  public static void main(String[] args) {

  StringBuilder s1 = new StringBuilder("Hello Java!");

  String s2 = s1.toString();

  List lst = new ArrayList();

  lst.add(s2);

  System.out.println(s1.getClass());

  System.out.println(s2.getClass());

  System.out.println(lst.getClass());

  }

  }

  What is the result?

  A. class java.lang.String class java.lang.String class java.util.ArrayList
  B. class java.lang.Object class java.lang. Object class java.util.Collection
  C. class java.lang.StringBuilder class java.lang.String class java.util.ArrayList
  D. class java.lang.StringBuilder class java.lang.String class java.util.List
  C. class java.lang.StringBuilder class java.lang.String class java.util.ArrayList

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  Explanation/Reference:

  class java.lang.StringBuilder class java.lang.String class java.util.ArrayList

• Question 150:

  Given:

  

  What is the result?

  A. 0:0 100:0
  B. null:0 100:0
  C. 0:0 100:200
  D. null:null 100:null
  A. 0:0 100:0

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  Explanation/Reference: