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：
An open record store, rs, contains five records with record IDs 1, 2, 3, 4, and 5.
1 . byte[] data = new byte[10];
2 .
3 . for (int i = 1; i <= rs.getNumRecords(); i++)
4 . {
5 . if (rs.getRecordSize(i) > data.length)
6 . data = new byte[rs.getRecordSize(i)];
7 . rs.getRecord(i, data, 0);
8 . System.out.println(new String(data));
9 . }
If record ID 3 is deleted, and the code is run, what is the result?
A. This code generates a NullPointerException.
B. This code generates a RecordIDException.
C. This code generates an InvalidRecordIDException.
D. This code runs without any errors.
E. This code generates a RuntimeException.
正解：C

質問 3：
Given:
11. Alert alt = new Alert("");
12. alt.setType(AlertType.ALARM);
Which line of code requests alt to display an alert until acknowledged by the user?
A. alt.setType(Alert.FOREVER);
B. alt.setTimeout(Alert.MODAL);
C. alt.setType(Alert.MODAL);
D. alt.setTimeout(Alert.FOREVER);
正解：D

質問 4：
Given a MIDP 2.0 device supports alpha blending, a MIDlet needs to render semi- transparent images of size 10x10 pixels. However, these images need to be generated at runtime. That is, they CANNOT be loaded as PNGs. What is the correct way to create a
10x10, red, semi-transparent image, using only the MIDP 2.0 API?
A. use createRGBImage() to create an immutable Image from ARGB data with the desired values
B. use createImage() to create a mutable Image; first fill it with white pixels, then fill it with red pixels
C. use createImage() to create a mutable Image, then fill it with red pixels
D. This is not possible. An Image with semi-transparency CANNOT be created at runtime.
正解：A

質問 5：
Which is true regarding CLDC?
A. A CLDC implementation CANNOT provide features that are optional.
B. A CLDC implementation must provide at least one optional feature.
C. A CLDC implementation generally defines a superset of J2SE technology.
D. A CLDC implementation can provide features that are optional.
正解：A

質問 6：
Which two are true about record store listeners? (Choose two.)
A. To listen for all events, three listeners must be registered.
B. A record store can have more than one registered listener.
C. Listeners are notified if a record store is deleted.
D. A record store can have only one registered listener.
E. When a record store is closed, listeners are removed.
正解：B,E

質問 7：
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
(Class.forName("com.example.ChatMIDlet"), chatTime);
C. PushRegistry.registerAlarm
("com.example.ChatMIDlet", chatTime);
D. PushRegistry.registerAlarm("MIDlet-1", chatTime);
正解：C

質問 8：
A MIDP 2.0 compliant device creates an HTTP connection to a server that supports HTTP
1.1. Which is true?
A. The device definitely supports HTTP 1.1.
B. There is no such thing as a 1.1 version of HTTP.
C. The device definitely does NOT support HTTP 1.1.
D. The device may or may NOT support HTTP 1.1.
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