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Oracle 1Z0-869 Exam Syllabus Topics:

Oracle Java Mobile Edition 1 Mobile Application Developer Certified Professional Sample Questions:

1. 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 must throw only checked (non-runtime) exceptions.
D) Rather than throwing the Error class specified by the Java Language Specification, the CLDC-compliant virtual machine may throw a CLDC-supported superclass.
E) Developers do NOT receive asynchronous exceptions from a CLDC-compliant virtual machine.

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

A) java.lang.OutOfMemoryError
B) java.lang.VirtualMachineError
C) java.lang.StackOverflowError
D) java.lang.UnknownError

3. Which four are direct subclasses of Screen? (Choose four.)

A) TextField
B) Choice
C) TextBox
D) List
E) Alert
F) Canvas
G) Form

4. Given:
MIDlet-Push-1: datagram://:444, com.fooworks.PushExample, *
MIDlet-Push-2: datagram://:555, com.fooworks.PushExample, *
are statically registered push connections and given:
1 1. protected void startApp() {
1 2. String[] connections = PushRegistry.listConnections(true);
1 3. if(connections.length == 0) {
1 4. connections = PushRegistry.listConnections(false);
1 5. for (int i=0; i < connections.length; i++) {
1 6. new DatagramHandler(connections[i]).start();
1 7. }
1 8. } else {
1 9. for (int i=0; i < connections.length; i++) {
2 0. new DatagramHandler(connections[i]).start();
2 1. }
2 2. }
2 3. }
Which two identify what will go wrong if the code is invoked by the Application Management Software in response to an inbound connection notification? (Choose two.)

A) Duplicate DatagramHandler objects are created if the MIDlet is paused and then resumed.
B) The first inbound datagram is ignored, all subsequent datagrams are handled by DatagramHandler.
C) The first inbound datagram is handled, but all other datagrams are missed.
D) Datagrams for the active connection are handled, but any datagrams sent to the other port are missed.
E) An IOException is thrown if there are no active connections.

5. Given the MIDlet code:
1 1. DatagramConnection dgc = (DatagramConnection)Connector.open("datagram://:444");
1 2. Datagram datagram = dgc.newDatagram(20);
1 3. dgc.receive(datagram);
1 4. byte[] data = datagram.getData();
1 5. String s = new String(data);
1 6. list.append(s, null);
1 7. System.out.println("Datagram received: " + s);
Which two are true regarding the portability of the code between devices? (Choose two.)

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

Solutions: