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Practice Exam 1: Answers
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12 Beach() { s = "Beach"; } 13 Beach getBeach() { return this; } 14 }
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What is the result A Beach LaSelva Beach B Beach LaSelva LaSelva C Beach LaSelva followed by an exception D Compilation fails due to an error at line 5 E F Compilation fails due to an error at line 6 Compilation fails due to an error at line 8
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G Compilation fails due to an error at line 13 Answer (for Objective 14): B is correct Line 5 is declaring a Beach array and assigning three Beach-ish objects to it The third object created in line 5 was created as type LaSelva, and then upcast to type Beach, but the value of its String didn t change when it was upcast Next, LaSelva s overriding getBeach() method is using a legal (as of Java 5) covariant return A, C, D, E, F, and G are incorrect based on the above
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34 When using the javaioConsole class, which are true (Choose all that apply) A Objects of type javaioConsole are created using a constructor from the same class B Objects of type javaioConsole are created using a method from the javaioFile class C Objects of type javaioConsole are created using a method from the javalang System class D Objects of type javaioConsole are created using a method from the javalang Object class E F The method(s) designed to read passwords can optionally disable the echoing of user input The method(s) designed to read passwords return a char[]
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Answer (for Objective 32): C and F are correct A, B, and D describe nonexistent approaches E is incorrect because the readPassword() methods always disable the echoing of user input
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3: Practice Exam 1
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35 Given:
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3 public class Stealth { 4 public static void main(String[] args) { 5 Integer i = 420; 6 Integer i2; 7 Integer i3; 8 i2 = iintValue(); 9 i3 = ivalueOf(420); 10 Systemoutprintln((i == i2) + " " + (i == i3)); 11 } }
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What is the result A true true B true false C false true D false false E F Compilation fails An exception is thrown at runtime
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Answer (for Objective 76): D is correct In this code, lines 8 and 9 each create a new Integer object, and == tests whether two references refer to the same object A, B, C, E, and F are incorrect based on the above
36 Given:
2 3 4 5 6 7 8 9 10 11 12 13 14 15 import javaio*; interface Risky { String doStuff() throws Exception; Risky doCrazy(); void doInsane(); } class Bungee implements Risky { public String doStuff() throws IOException { throw new IOException(); } public Bungee doCrazy() { return new Bungee(); } public void doInsane() throws NullPointerException { throw new NullPointerException(); } }
Practice Exam 1: Answers
What is the result (Choose all that apply) A Compilation succeeds B The Risky interface will not compile C The BungeedoStuff() method will not compile D The BungeedoCrazy() method will not compile E The BungeedoInsane() method will not compile
Answer (for Objective 12): A is correct, the code is all legal It s okay for an interface method to declare an exception It s okay for an implementing method to throw either a narrower exception or runtime exception Finally, it s okay for an implementing method to use a covariant return (as in line 12) B, C, D, and E are incorrect based on the above
37 Given that IllegalArgumentException extends RuntimeException, and given:
11 12 13 14 15 16 17 18 19 20 21 22 23 24 static String s = ""; public static void main(String[] args) { try { doStuff(); } catch (Exception ex) { s += "c1 "; } Systemoutprintln(s); } static void doStuff() throws RuntimeException { try { s += "t1 "; throw new IllegalArgumentException(); } catch (IllegalArgumentException ie) { s += "c2 "; } throw new IllegalArgumentException(); }
What is the result A c1 t1 c2 B c2 t1 c1 C t1 c1 c2 D t1 c2 c1 E F Compilation fails An uncaught exception is thrown at runtime
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