Oracle Oracle Certifications 1Z0-869 Questions & Answers

• Question 1:

  Which two are true? (Choose two.)

  A. GameCanvas always needs a separate thread to draw anything on the screen.

  B. paint() is never called for GameCanvas subclasses.

  C. Canvas.serviceRepaints() and Canvas.callSerially() can be used to create a constant frame-rate animation loop.

  D. Synchronous painting to the device display is possible with GameCanvas.

  Correct Answer: CD

• Question 2:

  Given a MIDlet that specifies a push registration in the JAD file as:

  MIDlet-Push-1: socket://:79, com.sun.example.SampleChat, *

  What is the result when the MIDlet is installed onto a device where another MIDlet has already registered the exact same push connection in the PushRegistry?

  A. The MIDlet installs, but the MIDlet must register the connection dynamically.

  B. The MIDlet installs and overwrites any existing push registrations.

  C. The MIDlet installs, but the connection CANNOT be used.

  D. The connection can only apply to the currently running MIDlet.

  E. The MIDlet installation is aborted and the user is notified of the problem.

  Correct Answer: E

• Question 3:

  Which two methods are available only within classes of the MIDP low-level UI API? (Choose two.)

  A. setPreferredSize()

  B. setFullScreenMode()

  C. getLayout()

  D. hasRepeatEvents()

  E. notifyStateChanged()

  Correct Answer: BD

• Question 4:

  Given:

  30.

  public boolean X(byte[] Y) throws IllegalArgumentException {

  31.

  ByteArrayInputStream bais = new ByteArrayInputStream(arg);

  32.

  DataInputStream dis = new DataInputStream(bais);

  33.

  String type = null; 34. try {type = dis.readUTF();}

  35.

  catch (Exception e) { }

  36.

  return(Z);

  37.

  }

  Which substitutions for X, Y, and Z in the code create a valid implementation of RecordFilter that matches records whose type is NOT deleted?

  A. X is matches Y is type Z is !type.equals("deleted")

  B. X is match Y is arg Z is type.equals("deleted")

  C. X is matches Y is arg Z is !type.equals("deleted")

  D. X is match Y is type Z is !type.equals("deleted")

  E. X is matches Y is arg Z is type.equals("deleted")

  Correct Answer: C

• Question 5:

  Click the Exhibit button.

  The application has a single Displayable object.

  Which two are true? (Choose two.)

  

  A. The Exit command must have been set with a priority equal to or greater than the priorities of commands Go, Foo, and Bar.

  B. If Go is a Command object, it is possible that another device would map Go to a button on the device (as opposed to a menu list).

  C. The program code did NOT necessarily specify the location of the Exit button.

  D. In the MIDlet code, a Command object of type Command.MENU must have been created.

  E. If Go, Foo, and Bar are all Command objects, each may have its own separate CommandListener object.

  Correct Answer: BC

• Question 6:

  Given:

  10.

  MessageConnection connection;

  11.

  12.

  public void startApp() {

  13.

  //...

  14.

  connection

  15.

  = (MessageConnection) Connector.open("sms://:6222");

  16.

  connection.setMessageListener(this);

  17.

  // ...

  28.

  }

  29.

  30.

  public void notifyIncomingMessage(MessageConnection conn) {

  31.

  //...

  40.

  }

  41.

  42.

  public void run() {

  43.

  Message msg = conn.receive();

  44.

  //...

  60. }

  Which two security permissions must this application request to be able to receive messages? (Choose two.)

  A. javax.microedition.io.Connector

  B. javax.microedition.io.Connector.sms

  C. javax.microedition.io.PushRegistry

  D. javax.wireless.messaging.sms.listener

  E. javax.wireless.messaging.sms.PushRegistry

  F. javax.wireless.messaging.sms.receive

  Correct Answer: BF

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• Question 7:

  The binding of networking protocols to a MIDlet at runtime can be compared to a type of relationship. Which relationship most closely matches the binding?

  A. mark and sweep

  B. specification and implementation

  C. caller and callee

  D. application and device drivers

  Correct Answer: D

• Question 8:

  Given the MIDlet code:

  11.

  DatagramConnection dgc =

  (DatagramConnection)Connector.open("datagram://:444");

  12.

  Datagram datagram = dgc.newDatagram(20);

  13.

  dgc.receive(datagram);

  14.

  byte[] data = datagram.getData();

  15.

  String s = new String(data);

  16.

  list.append(s, null);

  17.

  System.out.println("Datagram received: " + s);

  Which two are true regarding the portability of the code between devices? (Choose two.)

  A. Port 444 may be restricted or ignored by some MIDP implementations.

  B. The code is portable because all the classes and interfaces used are defined in the CLDC.

  C. Datagrams may not be supported on all platforms.

  D. Installation will fail on devices that do not support datagrams.

  Correct Answer: AC

• Question 9:

  Which two methods are available only within classes of the MIDP low-level UI API? (Choose two.)

  A. setFullScreenMode()

  B. hasRepeatEvents()

  C. setPreferredSize()

  D. notifyStateChanged()

  E. getLayout()

  Correct Answer: AB

• Question 10:

  Given:

  1.

  import javax.microedition.midlet.*;

  2.

  public class Foo extends MIDlet {

  3.

  public void go() {

  4.

  ThreadGroup x = Thread.currentThread().getThreadGroup();

  5.

  int numThreads = x.activeCount();

  6.

  Thread[] threads = null;

  7.

  x.enumerate(threads);

  8.

  }

  9.

  public void destroyApp(boolean b) { }

  10.

  public void pauseApp() { }

  11.

  public void startApp() { }

  12.

  }

  What is the result?

  A. Compilation succeeds, but the program produces a runtime exception or error.

  B. Compilation fails because of an error on a line other than 4 or 7.

  C. Compilation fails because of an error on line 4.

  D. Compilation fails because of an error on line 7.

  E. Compilation succeeds and the program runs without errors.

  Correct Answer: C