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Practice Exam 4: Answers
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10 public void run() { 11 for(int i = 0; i < 2; i++) 12 Systemoutprint(ThreadcurrentThread()getId() + " "); 13 } }
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Which are true (Choose all that apply) A No output is produced B The output could be 1 1 9 9 1 C The output could be 1 2 9 9 2 D The output could be 1 9 9 9 9 E F An exception is thrown at runtime Compilation fails due to an error on line 4
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G Compilation fails due to an error on line 8 Answer (for Objective 41): is correct It s legal to get the ID of the "main" thread It s also legal to call run() B directly, but it won t start a new thread In this case, it s just invoking run() on main s call stack In this code, t2 is never started, so there are only two threads (main and t1), therefore only two IDs are in the output D is incorrect because no thread s getId() method is called more than three times A, C, E, F, and G are incorrect based on the above 49 Given:
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14 15 16 17 FileWriter fw1 = new FileWriter(new File("f1txt")); FileWriter fw2 = new FileWriter(new BufferedWriter(new PrintWriter("f2txt"))); PrintWriter pw1 = new PrintWriter(new BufferedWriter(new FileWriter("f3txt"))); PrintWriter pw2 = new PrintWriter(new FileWriter(new File("f4txt")));
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And given the proper imports and error handling, what is the result A Compilation succeeds B Compilation fails due to multiple errors C Compilation fails due only to an error on line 14
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7: Practice Exam 4
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D Compilation fails due only to an error on line 15 E F Compilation fails due only to an error on line 16 Compilation fails due only to an error on line 17
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Answer (for Objective 32): is correct The code is using so-called chained-methods (or constructors) syntax The D *objects* fw1, pw1, and pw2 are created correctly The *object* fw2 cannot be created because a FileWriter cannot be constructed using a BufferedWriter object A, B, C, E, and F are incorrect based on the above 50 Given:
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2 import javautil*; 3 public class GIS { 4 public static void main(String[] args) { 5 TreeMap<String, String> m1 = new TreeMap<String, String>(); 6 m1put("a", "amy"); m1put("f", "frank"); 7 NavigableMap<String, String> m2 = m1descendingMap(); 8 try { 9 m1put("j", "john"); 10 m2put("m", "mary"); 11 } 12 catch (Exception e) { Systemoutprint("ex "); } 13 m1pollFirstEntry(); 14 Systemoutprintln(m1 + "\n" + m2); 15 } }
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What is the result A {f=frank, j=john} {f=frank} B {f=frank, j=john} {m=mary, f=frank} C ex {f=frank, j=john} {f=frank} D {f=frank, j=john, m=mary} {m=mary, j=john, f=frank} E F ex {f=frank, j=john, m=mary} {f=frank} ex {f=frank, j=john, m=mary} {f=frank, a=amy}
G {a=amy, f=frank, j=john, m=mary} {f=frank, a=amy} H Compilation fails due to error(s) in the code
Practice Exam 4: Answers
Answer (for Objective 63): is correct The descendingMap() method creates a NavigableMap in reverse order, D which is backed to the map it was created from It is NOT a subMap, so there is no worry about being outside of its range The pollFirstEntry() method returns AND removes the first entry in the Map A, B, C, E, F, G, and H are incorrect based on the above 51 Given:
2 3 4 5 6 7 8 9 10 11 12 public class Clover extends Harrier { String bark() { return "feed me "; } public static void main(String[] args) { Dog[] dogs = new Dog[3]; dogs[0] = new Harrier(); dogs[1] = (Dog)new Clover(); dogs[2] = (Dog)new Harrier(); for(Dog d: dogs) Systemoutprint(dbark()); } } class Dog { String bark() { return "bark "; } } class Harrier extends Dog { String bark() { return "woof "; } }
What is the result (Choose all that apply) A bark bark bark B woof bark bark C woof feed me woof D Compilation fails due to an error on line 6 E F Compilation fails due to an error on line 7 Compilation fails due to an error on line 8
G Compilation fails due to an error on line 9 Answer (for Objective 52): is correct All the code is legal, and line 9 is using a for-each loop The polymorphic C invocations of bark() use the version of bark() that corresponds with the object s type, not the reference variable s type A, B, D, E, F, and G are incorrect based on the above
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