Oracle 1Z0-803 Online Practice Questions and Exam Preparation

Oracle 1Z0-803 Online Questions & Answers

• Question 21:

  Given:

  

  What is the result?

  A. box
  B. nbo
  C. bo
  D. nb
  E. An exception is thrown at runtime
  A. box

• Question 22:

  Given:

  

  What is the result?

  A. Good Day! Good Luck!
  B. Good Day! Good Day!
  C. Good Luck! Good Day!
  D. Good Luck! Good Luck!
  E. Compilation fails
  E. Compilation fails

• Question 23:

  Give:

  Public Class Test { }

  Which two packages are automatically imported into the java source file by the java compiler?

  A. Java.lang
  B. Java.awt
  C. Java.util
  D. Javax.net
  E. Java.*
  F. The package with no name
  A. Java.lang
  F. The package with no name

  ---

  For convenience, the Java compiler automatically imports three entire packages for each source file: (1) the package with no name, (2) the java.lang package, and (3) the current package (the package for the current file).

  Note:Packages in the Java language itself begin with java. or javax.

  Incorrect answers:

  Java.awt: basic hierarchy of packages for native GUI components Javax.net: networking operations, sockets, DNS lookups, etc.

• Question 24:

  Given: What is the result?

  

  A. Compilation fails
  B. An exception is thrown at runtime
  C. There is no result because this is not correct way to determine the hash code
  D. Hash is: 111111, 44444444, 999999999
  A. Compilation fails

  ---

  The compilation fails as SampleClassA and SampleClassB cannot override SampleClass because the return type of SampleClass is int, while the return type of SampleClassA and SampleClassB is long.

  Note: If all three classes had the same return type the output would be: Hash is : 111111, 44444444, 999999999

• Question 25:

  Given:

  

  What is the result?

  A. Hello
  B. Default
  C. Compilation fails
  D. The program prints nothing
  E. An exception is thrown at run time
  A. Hello

  ---

  The program compiles fine. The program runs fine. The output is: hello

• Question 26:

  Given:

  public class Main {

  public static void main(String[] args) {

  try {

  doSomething();

  }

  catch (SpecialException e) {

  System.out.println(e);

  }}

  static void doSomething() {

  int [] ages = new int[4];

  ages[4] = 17;

  doSomethingElse();

  }

  static void doSomethingElse() {

  throw new SpecialException("Thrown at end of doSomething() method"); } }

  What is the output?

  A. SpecialException: Thrown at end of doSomething() method
  B. Error in thread "main" java.lang. ArrayIndexOutOfBoundseror
  C. Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4 at Main.doSomething(Main.java:12) at Main.main(Main.java:4)
  D. SpecialException: Thrown at end of doSomething() method at Main.doSomethingElse(Main.java:16) at Main.doSomething(Main.java:13) at Main.main(Main.java:4)
  C. Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4 at Main.doSomething(Main.java:12) at Main.main(Main.java:4)

  ---

  The following line causes a runtime exception (as the index is out of bounds):

  ages[4] = 17;

  A runtime exception is thrown as an ArrayIndexOutOfBoundsException.

  Note: The third kind of exception (compared to checked exceptions and errors) is the runtime exception. These are exceptional conditions that are internal to the application, and that the application usually cannot anticipate or recover from.

  These usually indicate programming bugs, such as logic errors or improper use of an API.

  Runtime exceptions are not subject to the Catch or Specify Requirement. Runtime exceptions are those indicated by RuntimeException and its subclasses.

• Question 27:

  Given the code fragment:

  String[] cartoons = {"tom","jerry","micky","tom"}; int counter =0;

  if ("tom".equals(cartoons[0])) {

  counter++;

  } else if ("tom".equals(cartoons[1])) {

  counter++;

  } else if ("tom".equals(cartoons[2])) {

  counter++;

  } else if ("tom".equals(cartoons[3])) {

  counter++;

  }

  System.out.print(counter);

  What is the result?

  A. 1
  B. 2
  C. 4
  A. 1

  ---

  Counter++ will be executed only once because of the else if constructs.

• Question 28:

  Given:

  

  What will be the output?

  

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

• Question 29:

  Which code fragment is illegal?

  

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

  ---

  The abstract keyword cannot be used to declare an int variable.

  The abstract keyword is used to declare a class or method to be abstract[3]. An abstract method has no implementation; all classes containing abstract methods must themselves be abstract, although not all abstract classes have abstract methods.

• Question 30:

  Which two will compile, and can be run successfully using the command: Java fred1 hello walls

  

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

  ---

  Throws java.lang.ArrayIndexOutOfBoundsException: 2 at certquestions.Fred1.main(Fred1.java:3) C. Prints out: [Ljava.lang.String;@39341183

  D. Prints out: walls