Oracle 1Z0-869 問題集

質問 1：
Which arguments should be passed to Connector.open() and TextMessage.setAddress(), respectively, to initiate an SMS text message using a server connection?
A. sms://:1234, with no need to call setAddress()
B. sms://+18005551234 and sms://:1234
C. sms://:1234 and sms://+18005551234
D. sms://+18005551234, with no need to call setAddress()
正解：C

質問 2：
What is the area that the developer must paint when using CustomItem?
A. CustomItem is limited to painting in the content area.
B. CustomItem must paint the content area, its labels, and its border.
C. CustomItem size is always honored by the system. Once created, the CustomItem always has this area to paint in.
D. The areas are unlimited. CustomItem may paint inside any area on the screen.
正解：A

質問 3：
Given the MIDlet code:
1 1. public void startApp() {
1 2. Form f = new Form("hello");
1 3. Display.getDisplay(this).setCurrent(f);
1 4. System.gc();
1 5. System.exit(0);
1 6. f.append("foo");
1 7. }
What is the result?
A. The application runs, and foo prints to the current display.
B. Compilation fails.
C. The application runs, but line 15 is ignored.
D. The application runs without exception, but foo is not printed.
E. The application runs, but throws an exception at runtime.
正解：E

質問 4：
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) { }
1 0. public void pauseApp() { }
1 1. public void startApp() { }
1 2. }
What is the result?
A. Compilation fails because of an error on line 4.
B. Compilation fails because of an error on line 7.
C. Compilation succeeds, but the program produces a runtime exception or error.
D. Compilation succeeds and the program runs without errors.
E. Compilation fails because of an error on a line other than 4 or 7.
正解：A

質問 5：
Which URL indicates the intention for one JTWI device to communicate with another JTWI device?
A. sms://+18005551234:1234
B. sms://+18005551234
C. cbs://+18005551234
D. cbs://+18005551234:1234
正解：A

質問 6：
Given a class named MyCanvas, which three CANNOT be used if MyCanvas is a direct subclass of Canvas? (Choose three.)
A. isDoubleBuffered();
B. public MyCanvas(boolean t) {
super(true);
}
C. flushGraphics();
D. Sprite s = new Sprite(anImage, 20,20);
E. keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0) { }
F. gameAction = getGameAction(keyCode) { }
正解：B,C,E

質問 7：
How would a MIDlet that uses a GameCanvas efficiently update only a small region of the screen, from the data in the off-screen buffer?
A. call serviceRepaints() and set a clip region on the Graphics object in paint()
B. call flushGraphics(int, int, int, int) that specifies the region to be flushed
C. write extra code to coalesce the flushGraphics() calls over many loops into one call
D. Pixels that are NOT to be flushed should be made transparent.
正解：B

質問 8：
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 9：
A MIDlet suite has the application descriptor fragment: MIDlet-1: E-mail, email.png, com.example.EmailMIDlet The MIDlet suite has the necessary permissions to use the PushRegistry. What line does the application descriptor need to register the MIDlet suite for socket push connections on port 79?
A. MIDlet-Push-1: socket://:79, E-mail, *
B. MIDlet-Push-1: socket://:79, com.example.EmailMIDlet, *
C. MIDlet-Push-1: socket://:79, EmailMIDlet, *
D. MIDlet-Push-1: socket://:79, MIDlet-1, *
正解：B