310-056 Sun - Braindumps.com.ua: question list for "Sun Certified Programmer for J2SE 5.0 Upgrade Exam", page: 8

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Sun 310-056: Sun Certified Programmer for J2SE 5.0 Upgrade Exam

#71. Given:

 12. NumberFormat nf = NumberFormat.getlnstance(); 
 13. nf.setMaximumFractionDigits(4); 
 1& nf.setMinimumFractionDigits(2); 
 15. String a = nf.format(3.1415926); 
 16. String b = nf.format(2);

Which two statements are true about the result if the detault locale is LocaleUS? (Choose two.)

#72. When comparing java.io.BufferedWriter to java.ioFileWriter, which capability exists as a method in only one of the two?

#73. Given:

 1. public class TestString3 { 
 2. public static void main(String[] args) { 
 3. // insert code here 
 5. System.out.println(s); 
 6. } 
 7. }

Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.)

#74. Given:

 1. public class MyLogger { 
 2. private StringBuilder logger = new StringBuuilder(); 
 3. public void log(String message, String user) { 
 4. logger.append(message); 
 5. logger.append(user); 
 6. } 
 7. }

The programmer must guarantee that a single MyLogger object works properly for a multithreaded system.
How must this code be changed to be thread-safe?

#75. Given:

 12. String csv = “Sue ,5,true,3”; 
 13. Scanner scanner = new Scanner( csv ); 
 14. scanner.useDelimiter(”,”); 
 15. int age = scanner.nextlnt();

What is the result?

#76. Given:

 1. public class Threads5 { 
 2. public static void main (String[] args) { 
 3. new Thread(new Runnable() { 
 4. public void run() { 
 5. System.out.print(”bar”); 
 6. }}).start(); 
 7. } 
 8. }

What is the result?

#77. Given:

 1. public class Threads3 implements Runnable { 
 2. public void run() { 
 3. System .out.print(”running”); 
 4. } 
 5. public static void main(String[] args) { 
 6. Thread t = new Thread(new Threads3()); 
 7. t.run(); 
 6. t.run(); 
 9. t.start(); 
 10. } 
 11. }

What is the result?

#78. Given:

 1. public class TestOne { 
 2. public static void main (String[] args) throws Exception { 
 3. Thread.sleep(3000); 
 4. System .out.println(”sleep”); 
 5. } 
 6. }

What is the result?

#79. Given this method in a class:

 21. public String toString() { 
 22. Stringsuffer buffer = new Stringsuffero; 
 23. buffer.append(’cz’); 
 24. buffer.append(this.name); 
 25. buffer.append(’>’); 
 26. return buffer.tostringo; 
 27. }

Which statement is true?

#80. Given:

 11. double input = 314159.26; 
 12. NumberFormat nf = NumberFormat.getlnstance(Locale.ITALIAN); 
 13. String b; 
 14. //insert code here

Which code, inserted at line 14, sets the value of b to 314.159,26?

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Sun 310-056

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