SUN. Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition, Version 1.0

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1 SUN Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition, Version 1.0 Download Full Version :

2 QUESTION: 332 Given: 10. public class ExampleMIDlet extends MIDlet { 11. // public boolean hascompleted() { 21. // } 31. public boolean islowonmemory() { 32. // } 41. public void destroyapp(boolean arg) { 42. if (X) throw new MIDletStateChangeException(); 43. } 44. // } Which substitution for X conforms to the MIDP specification? A.!arg B. true C. islowonmemory() D.!hasCompleted() E. arg && islowonmemory() F.!arg!hasCompleted() Answer: A QUESTION: 333 Which two are true about MIDlet suite provisioning? (Choose two.) A. A JTWI-compliant device must support HTTP 1.1. B. A JTWI-compliant device must support HTTP 1.0. C. A JTWI-compliant device must support HTTP authentication. D. A JTWI-compliant device must support HTTP 1.1 and cookies. Answer: A, C QUESTION: 334 Given the MIDlet code: 11. public void startapp() { 12. Form f = new Form("hello"); 13. Display.getDisplay(this).setCurrent(f); 14. System.gc(); 15. System.exit(0); 152

3 16. f.append("foo"); 17. } What is the result? A. Compilation fails. B. The application runs, but line 15 is ignored. C. The application runs, but throws an exception at runtime. D. The application runs, and foo prints to the current display. E. The application runs without exception, but foo is not printed. Answer: C QUESTION: 335 Given the MIDlet code: 7.//.. 10.public void startapp(){ 11.Float f = new Float(3.14); 12.System.out.println("Pi: " + f); } 15.//.. What is the result when working with a CLDC 1.1 implementation? A. Compilation fails. B. An exception is thrown at runtime. C. Pi: 3.14 is sent to the device display. D. Pi: 3.14 is sent to the system console. Answer: D QUESTION: 336 Given the MIDlet code: 3. public void go() { 4. try { 5. dostuff(); 6. } catch(java.lang.illegalaccesserror e) { 7. aform.append("an Error"); 8. } 9. } Assuming the aform variable on line 7 is a correctly initialized Form and set to the current display, what is the result? 153

4 A. Compilation fails due to a problem on line 6. B. Compilation fails due to a problem on line 7. C. The MIDlet fails at runtime due to a problem on line 6. D. The MIDlet fails at runtime due to a problem on line 7. E. An Error is printed to the display if an IllegalAccessError occurs. Answer: A QUESTION: 337 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 fails because of an error on line 4. B. Compilation fails because of an error on line 7. C. Compilation succeeds and the program runs without errors. D. Compilation fails because of an error on a line other than 4 or 7. E. Compilation succeeds, but the program produces a runtime exception or error. Answer: A QUESTION: 338 Which two are true about errors and exceptions in a CLDC-compliant virtual machine? (Choose two.) A. Developers are NOT allowed to handle errors. B. Developers must throw only checked (non-runtime) exceptions. C. A CLDC-compliant virtual machine must NOT throw a VirtualMachineError. D. 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. 154

5 Answer: D, E QUESTION: 339 Which four are absent from the CLDC virtual machine? (Choose four.) A. multi-threading B. class file verification C. custom class loaders D. asynchronous exceptions E. inner and anonymous classes F. object.finalize() method G. thread groups and daemon threads Answer: C, D, F, G QUESTION: 340 Which is true about the garbage collector? A. It needs to be run by the developer. B. It manages all memory deallocation. C. It effectively prevents memory leaks. D. It always uses the mark and sweep algorithm. Answer: B 155

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