Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 61:

  Given:

  

  What is the result?

  A. 6 7 8
  B. 7 8 9
  C. 0 1 2
  D. 6 8 10
  E. Compilation fails
  A. 6 7 8

• Question 62:

  Given:

  public class MyFor {

  public static void main(String[] args) {

  for (int ii = 0; ii < 4; ii++) {

  System.out.println("ii = "+ ii);

  ii = ii +1;

  }

  }

  }

  What is the result?

  A. ii = 0 ii = 2
  B. ii = 0 ii = 1 ii = 2 ii = 3
  C. ii =
  D. Compilation fails.
  A. ii = 0 ii = 2

• Question 63:

  Which three are advantages of the Java exception mechanism?

  A. Improves the program structure because the error handling code is separated from the normal program function
  B. Provides a set of standard exceptions that covers all the possible errors
  C. Improves the program structure because the programmer can choose where to handle exceptions
  D. Improves the program structure because exceptions must be handled in the method in which they occurred
  E. allows the creation of new exceptions that are tailored to the particular program being
  A. Improves the program structure because the error handling code is separated from the normal program function
  C. Improves the program structure because the programmer can choose where to handle exceptions
  E. allows the creation of new exceptions that are tailored to the particular program being

  ---

  A: The error handling is separated from the normal program logic.

  C: You have some choice where to handle the exceptions.

  E: You can create your own exceptions. Incorrect answers:

  B: The standard exceptions do not cover all possible errors. D. Exceptions do not need to be handled in the method where they occurred. They can be handled in the method which is calling the method that throws an exception.

• Question 64:

  Given:

  class Overloading {

  int x(double d) {

  System.out.println("one");

  return 0;

  }

  String x(double d) {

  System.out.println("two");

  return null;

  }

  double x(double d) {

  System.out.println("three");

  return 0.0;

  }

  public static void main(String[] args) {

  new Overloading().x(4.0);

  }

  }

  What is the result?

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

• Question 65:

  Given the code fragment:

  String name = "Spot";

  int age = 4;

  String str ="My dog " + name + " is " + age;

  System.out.println(str);

  And

  StringBuilder sb = new StringBuilder();

  Using StringBuilder, which code fragment is the best potion to build and print the following string My dog Spot is 4

  A. sb.append("My dog " + name + " is " + age); System.out.println(sb);
  B. sb.insert("My dog ").append( name + " is " + age); System.out.println(sb);
  C. sb.insert("My dog ").insert( name ).insert(" is " ).insert(age); System.out.println(sb);
  D. sb.append("My dog ").append( name ).append(" is " ).append(age); System.out.println(sb);
  A. sb.append("My dog " + name + " is " + age); System.out.println(sb);
  D. sb.append("My dog ").append( name ).append(" is " ).append(age); System.out.println(sb);

• Question 66:

  Given:

  

  What code should be inserted?

  

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

  ---

  Dog should be an abstract class. The correct syntax for this is: abstract class Dog { Poodle should extend Dog (not implement).

• Question 67:

  Given: What is the result?

  

  A. true true
  B. true false
  C. false true
  D. false false
  E. Compilation fails
  E. Compilation fails

• Question 68:

  Given:

  public class DoBreak1 {

  public static void main(String[] args) {

  String[] table = {"aa", "bb", "cc", "dd"};

  for (String ss: table) {

  if ( "bb".equals(ss)) {

  continue;

  }

  System.out.println(ss);

  if ( "cc".equals(ss)) {

  break;

  }

  }

  }

  }

  What is the result?

  A. aa cc
  B. aa bb cc
  C. cc dd
  D. cc
  E. Compilation fails.
  A. aa cc

• Question 69:

  The catch clause argument is always of type__________.

  A. Exception
  B. Exception but NOT including RuntimeException
  C. Throwable
  D. RuntimeException
  E. CheckedException
  F. Error
  C. Throwable

  ---

  Because all exceptions in Java are the sub-class ofjava.lang.Exception class, you can have a single catch block that catches an exception of type Exception only.

  Hence the compiler is fooled into thinking that this block can handle any exception.

  See the following example:

  try

  {

  // ...

  }

  catch(Exception ex)

  {

  // Exception handling code for ANY exception

  }

  You can also use the java.lang.Throwable class here, since Throwable is the parent class for the application-specific Exception classes. However, this is discouraged in Java programming circles. This is because Throwable happens to also

  be the parent class for the non-application specific Error classes which are not meant to be handled explicitly as they are catered for by the JVM itself.

  Note: The Throwable class is the superclass of all errors and exceptions in the Java language. Only objects that are instances of this class (or one of its subclasses) are thrown by the Java Virtual Machine or can be thrown by the Java throw

  statement. A throwable contains a snapshot of the execution stack of its thread at the time it was created. It can also contain a message string that gives more information about the error.

• Question 70:

  Given the code fragment:

  public class ForTest {

  public static void main(String[] args) {

  int[] array = {1, 2, 3};

  for ( foo ) {

  }

  }

  Which three code fragments, when replaced individually for foo, enables the program to compile?

  A. int i : array
  B. int i = 0; i < 1;
  C. ; ;
  D. ; i < 1; i++
  E. i = 0; i
  A. int i : array
  B. int i = 0; i < 1;
  C. ; ;