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Encoding ANSI/AIM Code 128 in Java 5: Practice Exam 2

5: Practice Exam 2
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Answer (for Objective 14): B, C, D, and F are correct It s legal for overridden methods to have less restrictive access modifiers, to have fewer or narrower checked exceptions, and to have unchecked exceptions (Note: Of course, F would throw an exception at runtime) A is incorrect because Exception is broader E is incorrect because private is more restrictive
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4 public class Zingseng extends Thread { 5 public static void main(String[] args) throws Exception { 6 Thread t1 = new Thread(new Zingseng()); 7 t1start(); 8 // insert code here 9 for(int i = 0; i < 1000; i++) // Loop #1 10 Systemoutprint(ThreadcurrentThread()getName() + " "); 11 } 12 public void run() { 13 for(int i = 0; i < 1000; i++) // Loop #2 14 Systemoutprint(ThreadcurrentThread()getName() + " "); 15 } }
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Which code, inserted independently at line 8, will make most (or all) of Loop #2 s iterations run before most (or all) of Loop #1 s iterations (Choose all that apply) A // just a comment B t1join(); C t1yield(); D t1sleep(1000); Answer (for Objective 42): B and D are correct The join() method will tack the main thread s execution to the end of t1 s execution The t1sleep(1000) method will put the main thread to sleep for one second (remember sleep() is static!!!) A is incorrect because the two threads run order will be unpredictable C is incorrect because yield() might cause a tiny interruption (where 1000 milliseconds would be a HUGE interruption), but it probably wouldn t significantly change the run order
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Practice Exam 2: Answers
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2 3 5 6 7 8 9 10 11 12 public class Kant extends Philosopher { // insert code here public static void main(String[] args) { new Kant("Homer"); new Kant(); } } class Philosopher { Philosopher(String s) { Systemoutprint(s + " "); } }
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Which set(s) of code, inserted independently at line 3, produce the output "Homer Bart " (Choose all that apply) A Kant() { this("Bart"); } Kant(String s) { super(s); } B Kant() { super("Bart"); } Kant(String s) { super(s); }
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C Kant() { super(); } Kant(String s) { super(s); } D Kant() { super("Bart"); } Kant(String s) { this(); } E Kant() { super("Bart"); } Kant(String s) { this("Homer"); }
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Answer (for Objective 15): A and B are two correct ways for Kant s constructors to interact with Philosopher s constructor C will not compile because Kant s constructors assume Philosopher has a no-arg constructor D compiles but produces the output "Bart Bart " E will not compile because the one-arg constructor is attempting to call itself recursively
32 Given:
2 public class Epoch { 3 static int jurassic = 0; 4 public static void main(String[] args) { 5 assert(doStuff(5)); 6 }
5: Practice Exam 2
7 static boolean doStuff(int x) { 8 jurassic += x; 9 return true; 10 } }
Which are true (Choose all that apply) A The code compiles using javac -ea Epochjava B The assert statement on line 5 is used appropriately C The code compiles using javac -source 13 Epochjava D The code compiles using javac -source 14 Epochjava E F The code compiles using javac -source 16 Epochjava The code will not compile using any version of the javac compiler
Answer (for Objective 23): D and E are correct (and C is incorrect) because "assert" was not a keyword until Java 14 A is incorrect because -ea is a java command, not javac B is incorrect because an assertion should never cause a state change F is incorrect based on the above
33 Given
1 public class Kaput { 2 Kaput myK; 3 String degree = "0"; 4 public static void main(String[] args) { 5 Kaput k1 = new Kaput(); 6 go(k1); 7 Systemoutprintln(k1degree); 8 } 9 static Kaput go(Kaput k) { 10 final Kaput k1 = new Kaput(); 11 kmyK = k1; 12 kmyKdegree = "7"; 13 return kmyK; 14 } }
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