Oracle 1Z0-869 問題集

質問 1：
A JTWI device has a working socket implementation. A MIDlet requests permission to use socket connections on this device using the attribute MIDlet-Permissions-Opt, but is denied permission.
Given:
2 0. public void connect() {
2 1. try {
2 2. String addr = "socket://host.com:79";
2 3. SocketConnection sc;
2 4. sc = (SocketConnection) Connector.open(addr);
2 5. sc.setSocketOption(SocketConnection.LINGER, 5);
2 6. InputStream is = sc.openInputStream();
2 7. OutputStream os = sc.openOutputStream();
2 8. os.write("\\r\\n".getBytes());
2 9. int ch = is.read();
3 0. // ...
3 5. } catch (IOException ioe) {
3 6. // ...
4 0. }
4 1. }
Which is true assuming that the argument to Connector.open() points to a valid destination, and the device has resources to create new socket connections?
A. If connect() executes, a SecurityException is thrown at runtime at line 28.
B. If connect() executes, a SecurityException is thrown at runtime at line 24.
C. If connect() executes, a ConnectionNotFoundException is thrown at runtime at line 24.
D. The device disallows the MIDlet to be installed.
E. If connect() executes, a SecurityException is thrown at runtime at line 26.
正解：B

質問 2：
How does a TiledLayer determine the sequence of frames in animated tiles?
A. They CANNOT be set. Animation is possible only with a Sprite.
B. The sequence of frames is obtained from an animated Sprite.
C. The tile to be displayed must be set during each frame of the animation.
D. The sequence of frames is obtained from the location in the source image.
正解：C

質問 3：
Which two are true when deleting a record store? (Choose two.)
A. If the record store is open, an exception will be thrown.
B. The record store must be open prior to calling deleteRecordStore().
C. The record store must be closed prior to calling deleteRecordStore().
D. For any registered listener of the record store, recordDeleted() will be called.
正解：A,C

質問 4：
A MIDlet has entered the paused state. Which is a valid action to attempt to make it active?
A. The MIDlet calls resumeRequest() through a timer.
B. The MIDlet cannot revert back to the active state.
C. The MIDlet calls its own startApp() method.
D. The MIDlet has to wait quietly to be rescheduled.
正解：A

質問 5：
Given:
rs is an object of type javax.microedition.rms.RecordStore.
baos is an object of type java.io.DataOutputStream.
recId is an int.
Which adds a record to rs?
A. byte [] b = baos.toByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
B. byte [] b = baos.writeByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
C. byte [] b = baos.write();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
D. byte [] b = baos.toByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
E. byte [] b = baos.write();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
F. byte [] b = baos.writeByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
正解：D

質問 6：
Which two are true about developing a MIDP 2.0-compliant user interface? (Choose two.)
A. Canvas is considered part of the low-level user interface API.
B. Double-buffering is not guaranteed when using Canvas.
C. Support for starting threads in an event handler is not guaranteed across all devices.
D. The only way to guarantee that text displays properly on the screen is to use the low- level API and draw the string directly in the paint() method.
E. Command instances are always mapped to soft buttons on the device.
F. TextBox is not a portable UI Displayable.
正解：A,B

質問 7：
Which method in javax.microedition.midlet.MIDlet is used to retrieve the attributes necessary to access a record store in a different MIDlet suite?
A. getAppProperty()
B. getProperty()
C. getAttribute()
D. checkPermission()
E. platformRequest()
F. getSuiteProperty()
正解：A

質問 8：
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 order of descending index.
B. The Sprites that are animated are rendered first.
C. The Sprites are rendered in a random order.
D. The Sprites are rendered in an implementation specific manner.
正解：A

質問 9：
Click the Exhibit button.
What is visible on the display when this MIDlet is executed?

A. A black screen is shown momentarily, and then a white screen is shown.
B. A white screen is shown momentarily, and then a black screen is shown.
C. The screen continuously switches back and forth between black and white.
D. A java.lang.RuntimeException is thrown.
正解：A