Oracle Oracle Certifications 1Z0-869 Questions & Answers

• Question 11:

  The developer is designing a game that uses the LayerManager and Sprite classes. Three Sprite objects are added to a LayerManager object and a call is placed to the LayerManager.paint(Graphics, x, y) method. In what order are the Sprite objects rendered to the device display?

  A. The Sprites are rendered in an implementation specific manner.

  B. The Sprites are rendered in a random order.

  C. The Sprites are rendered in order of descending index.

  D. The Sprites that are animated are rendered first.

  Correct Answer: C

• Question 12:

  A mobile application developer is trying to increase the performance of a game using the MIDP Game API. Which two are legal, valid approaches that fulfill the developer's goal? (Choose two.)

  A. restrict the number of frames per Sprite to one

  B. base collision detection on rectangle boundaries

  C. always ensure that the view window is larger than the visible screen

  D. implement keyPressed(), keyReleased(), and keyRepeated()

  E. poll for key states only when necessary

  Correct Answer: BE

• Question 13:

  Which two errors are available in CLDC? (Choose two.)

  A. java.lang.StackOverflowError

  B. java.lang.OutOfMemoryError

  C. java.lang.VirtualMachineError

  D. java.lang.UnknownError

  Correct Answer: BC

• Question 14:

  Which two events can result in the removal of a MIDlet's dynamic push connection registration? (Choose two.)

  A. Using a call to PushRegistry.removeConnection().

  B. Using a call to PushRegistry.unregisterConnection().

  C. Opening the connection using Connector.open().

  D. Using a call to PushRegistry.registerConnection().

  E. When MIDlet.destroyApp() is called.

  F. When the MIDlet is uninstalled.

  Correct Answer: BF

• Question 15:

  Click the Exhibit button. Which produces the results shown in device A and device B?

  

  A. A: g.drawString("Gray Flyer",0,0,Graphics.TOP | Graphics.BASELINE);

  B. g.drawString("Gray Flyer",0,0,Graphics.HCENTER | Graphics.BOTTOM);

  C. A: g.drawString("Gray Flyer",0,0,Graphics.LEFT | Graphics.BASELINE);

  D. g.drawString("Gray Flyer",0,0,Graphics.LEFT | Graphics.HCENTER);

  E. A: g.drawString("Gray Flyer",0,0,Graphics.TOP | Graphics.LEFT);

  F. g.drawString("Gray Flyer",0,0,Graphics.TOP | Graphics.HCENTER)

  G. A: g.drawString("Gray Flyer",0,0,Graphics.LEFT | Graphics.TOP);

  H. g.drawString("Gray Flyer",0,0,Graphics.TOP | Graphics.BASELINE);

  Correct Answer: C

• Question 16:

  Which three are top level interfaces in the javax.wireless.messaging package? (Choose three.)

  A. MessageListener

  B. MessageHandler

  C. MessageConnection

  D. Datagram

  E. Message

  F. Connector

  Correct Answer: ACE

• Question 17:

  What is TimeBase?

  A. a top-level MIDP 2.0 interface

  B. a top-level MMAPI interface

  C. a MIDP 2.0 interface extending the Control interface

  D. an MMAPI class implementing the Control interface

  Correct Answer: B

• Question 18:

  Given the JAD file fragment:

  MIDlet-1: Calendar, calendar.png, com.example.CalendarMIDlet

  MIDlet-2: Chat, chat.png, com.example.ChatMIDlet

  What CalendarMIDlet code launches ChatMIDlet at the time specified by variable chatTime?

  A. PushRegistry.registerAlarm("Chat", chatTime);

  B. PushRegistry.registerAlarm ("com.example.ChatMIDlet", chatTime);

  C. PushRegistry.registerAlarm("MIDlet-1", chatTime);

  D. PushRegistry.registerAlarm (Class.forName("com.example.ChatMIDlet"), chatTime);

  Correct Answer: B

• Question 19:

  Click the Exhibit button. What is the result?

  

  A. myForm contains the string "run count: 0".

  B. myForm contains the string "run count: 1".

  C. An exception is thrown at runtime.

  D. myForm contains the string "waiting...".

  E. myForm contains the string "run count: 2".

  Correct Answer: B

• Question 20:

  A MIDlet suite has several signer certification paths using X.509 PKI. Which is true?

  A. A JTWI device must validate all the certification paths to install the MIDlet suite. The signer certificates may contain different public keys.

  B. A JTWI device must validate all the certification paths to install the MIDlet suite. The signer certificates must contain the same public keys.

  C. A JTWI device needs to only validate one of the certification paths to install the MIDlet suite. The signer certificates may contain different public keys.

  D. A JTWI device needs to only validate one of the certification paths to install the MIDlet suite. The signer certificates must contain the same public keys.

  Correct Answer: D