Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 71:

  Given the following four Java file definitions:

  // Foo.java

  package facades;

  public interface Foo { }

  // Boo.java

  package facades;

  public interface Boo extends Foo { }

  // Woofy.java

  package org.domain

  // line n1

  public class Woofy implements Boo, Foo { }

  // Test.java

  package.org;

  public class Test {

  public static void main(String[] args) {

  Foo obj=new Woofy();

  Which set modifications enable the code to compile and run?

  A. At line n1, Insert: import facades; At line n2, insert: import facades; import org.domain;
  B. At line n1, Insert: import facades.*; At line n2, insert: import facades; import org.*;
  C. At line n1, Insert: import facades.*; At line n2, insert: import facades.Boo; import org.*;
  D. At line n1, Insert: import facades.Foo, Boo; At line n2, insert: import org.domain.Woofy;
  E. At line n1, Insert: import facades.*; At line n2, insert: import facades; import org.domain.Woofy;
  E. At line n1, Insert: import facades.*; At line n2, insert: import facades; import org.domain.Woofy;

• Question 72:

  Given:

  public class MainMethod {

  void main() {

  System.out.println("one");

  }

  static void main(String args) {

  System.out.println("two");

  }

  public static void main(String[] args) {

  System.out.println("three");

  }

  void mina(Object[] args) {

  System.out.println("four");

  }

  }

  What is printed out when the program is excuted?

  A. one
  B. two
  C. three
  D. four
  C. three

• Question 73:

  1.

  class StaticMethods {

  2.

  static void one() {

  3.

  two();

  4.

  StaticMethods.two();

  5.

  three();

  6.

  StaticMethods.four();

  7.

  }

  8.

  static void two() { }

  9.

  void three() {

  10.

  one();

  11.

  StaticMethods.two();

  12.

  four();

  13.

  StaticMethods.four();

  14.

  }

  15.

  void four() { }

  16.

  }

  Which three lines are illegal?

  A. line 3
  B. line 4
  C. line 5
  D. line 6
  E. line 10
  F. line 11
  G. line 12
  H. line 13
  C. line 5
  D. line 6
  H. line 13

• Question 74:

  Given the code fragment:

  // insert code here arr[0] = new int[3]; arr[0][0] = 1; arr[0][1] = 2; arr[0][2] = 3;

  arr[1] = new int[4]; arr[1][0] = 10; arr[1][1] = 20; arr[1][2] = 30; arr[1][3] = 40;

  Which two statements, when inserted independently at line // insert code here, enable the code to compile?

  A. int [] [] arr = null;
  B. int [] [] arr = new int [2];
  C. int [] [] arr = new int [2] [ ];
  D. int [] [] arr = new int [] [4];
  E. int [] [] arr = new int [2] [0];
  F. int [] [] arr = new int [0] [4];
  C. int [] [] arr = new int [2] [ ];
  E. int [] [] arr = new int [2] [0];

• Question 75:

  Given the code fragment:

  int a = 0;

  a++;

  System.out.printIn(a++);

  System.out.printIn(a);

  What is the result?

  A. 1
  C. 1
  D. 2
  A. 1

  ---

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

• Question 76:

  Given:

  

  What is the result?

  A. 2 4 6 8
  B. 2 4 6 8 9
  C. 1 3 5 7
  D. 1 3 5 7 9
  D. 1 3 5 7 9

• Question 77:

  Given:

  

  What is the result?

  A. 10 20 30 40
  B. 0 0 30 40 C. Compilation fails
  D. An exception is thrown at runtime
  A. 10 20 30 40

• Question 78:

  Given:

  

  And the commands: Javac Jump.java Java Jump crazy elephant is always

  What is the result?

  A. Lazy lion is jumping
  B. Lion is always jumping
  C. Crazy elephant is jumping
  D. Elephant is always jumping
  E. Compilation fails
  B. Lion is always jumping

• Question 79:

  Identify two benefits of using ArrayList over array in software development.

  A. reduces memory footprint
  B. implements the Collection API
  C. is multi.thread safe
  D. dynamically resizes based on the number of elements in the list
  A. reduces memory footprint
  D. dynamically resizes based on the number of elements in the list

  ---

  ArrayList supports dynamic arrays that can grow as needed. In Java, standard arrays are of a fixed length. After arrays are created, they cannot grow or shrink, which means that you must know in advance how many elements an array will hold. But, sometimes, you may not know until run time precisely how large of an array you need. To handle this situation, the collections framework defines ArrayList. In essence, an ArrayList is a variable-length array of object references. That is, an ArrayList can dynamically increase or decrease in size. Array lists are created with an initial size. When this size is exceeded, the collection is automatically enlarged. When objects are removed, the array may be shrunk.

• Question 80:

  Given the code fragment: What is the result?

  

  A. Found Red Found Default
  B. Found Teal
  C. Found Red Found Blue Found Teal
  D. Found Red Found Blue Found Teal Found Default
  E. Found Default
  B. Found Teal