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3: Practice Exam 1
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If instances of class Chilis are to be used as keys in a Map, which are true (Choose all that apply) A Without overriding hashCode(), the code will not compile B As it stands, the equals() method has been legally overridden C It s possible for such keys to find the correct entries in the Map D It s NOT possible for such keys to find the correct entries in the Map E F As it stands, the Chilis class legally supports the equals() and hashCode() contracts If hashCode() was correctly overridden, it would make retrieving Map entries by key easier
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Answer (for Objective 62): B, C, and E are correct If a class does NOT override equals() and hashCode(), class Object provides a default implementation The default implementation s logic is that only two references to THE SAME OBJECT will be considered equal Given that, it might appear that equals() has been overridden, but in practice this overridden equals() method performs exactly as the default method performs Therefore, the equals() and hashCode() methods will support their contracts, although it will be hard for a programmer to use this class for keys in a Map A is incorrect because the code compiles D is incorrect based on the above F is incorrect because in practice equals() hasn t really been overridden
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15 Given:
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2 public class Contact { 3 private String name; 4 private String city; 5 String getName() { return name; } 6 void setName(String n) { name = n; } 7 void setCity(String c) { 8 if(c == null) throw new NullPointerException(); 9 city = c; 10 } 11 String getCity() { return city; } 12 }
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Which are true (Choose all that apply) A Compilation fails B The class is well encapsulated
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Practice Exam 1: Answers
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C The setCity() method is an example of loose coupling D The setCity() method has better encapsulation than setName() E The setCity() method is cohesive; the setName() method is not
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Answer (for Objective 51): B is correct The setCity() method includes argument validation, which is a good thing It s not, by itself, an example of coupling or cohesion Also, validation doesn t make a method more encapsulated A is incorrect because it s legal to throw a NullPointerException without handling or declaring it C, D, and E are incorrect based on the above
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16 Given the current directory is bigApp, and the directory structure:
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bigApp |-- classes |-- Clonedclass
And the file:
public class Cloned { public static void main(String[] args) { Systemoutprintln("classes"); assert(IntegerparseInt(args[0]) > 0); } }
Which will produce the output "classes" followed by an AssertionError (Choose all that apply) A java -cp classes Cloned -4 B java -cp classes -ea Cloned C java -ea-cp classes Cloned -4 D java -ea -cp classes Cloned 4 E F java -ea, cp classes Cloned 4 java -ea -cp classes Cloned -4
G java -cp classes Cloned -4 -ea
3: Practice Exam 1
Answer (for Objective 72): F is the correct syntax for the java command A and G do not enable assertions (in G, the -ea is seen as the second argument) B throws an ArrayIndexOutOfBoundsException C and E are invalid syntax D passes the assert test
17 Given:
1 2 3 4 5 6 7 8 9 10 11 interface Syrupable { void getSugary(); } abstract class Pancake implements Syrupable { } class BlueBerryPancake implements Pancake { public void getSugary() { ; } } class SourdoughBlueBerryPancake extends BlueBerryPancake { void getSugary(int s) { ; } }
Which are true (Choose all that apply) A Compilation succeeds B Compilation fails due to an error on line 2 C Compilation fails due to an error on line 4 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 9
G Compilation fails due to an error on line 10 Answer (for Objective 11): D is correct Classes extend abstract classes, they don t implement them A, B, C, E, F, and G are incorrect The method on line 10 doesn t need to be declared public because it s an overload of the parent method, not an override
18 Given:
1 public class Endless { 2 public static void main(String[] args) { 3 int i = 0;
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