Oracle 1Z0-869 Online Practice Questions and Exam Preparation

Oracle 1Z0-869 Online Questions & Answers

• Question 51:

  What is the result if a call to serviceRepaints() triggers a separate thread to invoke paint()?

  A. An exception is thrown at runtime.
  B. The system may deadlock if the caller to serviceRepaints() holds a lock that is also needed by paint().
  C. A deadlock always occurs.
  D. MIDP is thread-safe. There will never be a deadlock.
  B. The system may deadlock if the caller to serviceRepaints() holds a lock that is also needed by paint().

• Question 52:

  A MIDP 2.0 compliant device creates an HTTP connection to a server that supports HTTP 1.1. Which is true?

  A. There is no such thing as a 1.1 version of HTTP.
  B. The device definitely does NOT support HTTP 1.1.
  C. The device may or may NOT support HTTP 1.1.
  D. The device definitely supports HTTP 1.1.
  D. The device definitely supports HTTP 1.1.

• Question 53:

  Which two can a developer use to create a Timer that will go off in 5 seconds, repeating every 3 seconds? (Choose two.)

  A. timer.schedule(timerTask, new Date().getTime() + 5000, 3000);
  B. timer.scheduleAtFixedRate(timerTask, 5, 3);
  C. timer.schedule(timerTask, 5000, 3000);
  D. timer.schedule(timerTask, 5, 3);
  E. timer.scheduleAtFixedRate(timerTask, 5000, 3000);
  C. timer.schedule(timerTask, 5000, 3000);
  E. timer.scheduleAtFixedRate(timerTask, 5000, 3000);

• Question 54:

  A mobile application developer is trying to reduce the memory footprint of a game using the MIDP Game API? Which is a valid approach?

  A. restrict the number of frames per Sprite to one
  B. implement keyPressed() and keyReleased()
  C. reuse a single GameCanvas throughout the application
  D. use a single bitmap background rather than multiple tiles
  C. reuse a single GameCanvas throughout the application

• Question 55:

  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. Installation will fail on devices that do not support datagrams.
  B. Port 444 may be restricted or ignored by some MIDP implementations.
  C. The code is portable because all the classes and interfaces used are defined in the CLDC.
  D. Datagrams may not be supported on all platforms.
  B. Port 444 may be restricted or ignored by some MIDP implementations.
  D. Datagrams may not be supported on all platforms.

• Question 56:

  Which two are true about errors and exceptions in a CLDC-compliant virtual machine? (Choose two.)

  A. A CLDC-compliant virtual machine must NOT throw a VirtualMachineError.
  B. Developers are NOT allowed to handle errors.
  C. Developers do NOT receive asynchronous exceptions from a CLDC-compliant virtual machine.
  D. Developers must throw only checked (non-runtime) exceptions.
  E. Rather than throwing the Error class specified by the Java Language Specification, the CLDC-compliant virtual machine may throw a CLDC-supported superclass.
  C. Developers do NOT receive asynchronous exceptions from a CLDC-compliant virtual machine.
  E. Rather than throwing the Error class specified by the Java Language Specification, the CLDC-compliant virtual machine may throw a CLDC-supported superclass.

• Question 57:

  Which declaration is illegal?

  A. openRecordStore("Customer_Name_and_Address", true);
  B. openRecordStore("Salesperson_Projections_by_Month", "acme", "sales");
  C. openRecordStore("High_Scores_Stored_by_City_and_Name", false);
  D. openRecordStore("Customer_Projections", true, RecordStore.AUTHMODE_ANY, true);
  C. openRecordStore("High_Scores_Stored_by_City_and_Name", false);

• Question 58:

  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 connection can only apply to the currently running MIDlet.
  B. The MIDlet installs and overwrites any existing push registrations.
  C. The MIDlet installation is aborted and the user is notified of the problem.
  D. The MIDlet installs, but the connection CANNOT be used.
  E. The MIDlet installs, but the MIDlet must register the connection dynamically.
  C. The MIDlet installation is aborted and the user is notified of the problem.

• Question 59:

  Which is used to retrieve the version of MIDP a device has implemented?

  A. System.getAppProperty("microedition.platform")
  B. System.getAppProperty("microedition.profiles")
  C. System.getProperty("microedition.configuration")
  D. System.getProperty("microedition.platform")
  E. System.getProperty("microedition.profiles")
  E. System.getProperty("microedition.profiles")

• Question 60:

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