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Practice Exam 3: Answers
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7 8 9 10 11 12 13 14 15 16 17 18 19 }
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List<Dog> d = new ArrayList<Dog>(); List<Collie> c = new ArrayList<Collie>(); dadd(new Collie()); cadd(new Collie()); do1(d); do1(c); do2(d); do2(c); } static void do1(List< extends Dog> d2) { d2add(new Collie()); Systemoutprint(d2size()); } static void do2(List< extends Canine> c2) {
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Which are true (Choose all that apply) A Compilation succeeds B Compilation fails due to an error on line 9 C Compilation fails due to an error on line 14 D Compilation fails due to an error on line 15 E F Compilation fails due to an error on line 16 Compilation fails due to an error on line 18
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G Compilation fails due to errors on lines 11 and 12 Answer (for Objective 64): D is correct When a method takes a wildcard generic type, the collection can be accessed or modified, but not both The rest of the code is legal It s legal to add a subclass element to a typed collection It s legal for a method s argument to be a typed wildcarded interface A, B, C, E, F, and G are incorrect based on the above
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34 Given:
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42 void go() { 43 int cows = 0; 44 int[] twisters = {1,2,3}; 45 for(int i = 0; i < 4; i++) 46 switch(twisters[i]) { 47 case 2: cows++; 48 case 1: cows += 10; 49 case 0: go(); 50 } 51 Systemoutprintln(cows); 52 }
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6: Practice Exam 3
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What is the result A 11 B 21 C 22 D Compilation fails E F A StackOverflowError is thrown at runtime An ArrayIndexOutOfBoundsException is thrown at runtime
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Answer (for Objective 26): E is correct Because of switch fall-through logic, the go() method is called recursively until the stack explodes (that s the vulgate) The for loop would fail with option F if it ever got to run to completion A, B, C, D, and F are incorrect based on the above
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35 Given:
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 class Robot { } interface Animal { } class Feline implements Animal { } public class BarnCat extends Feline { public static void main(String[] args) { Animal af = new Feline(); Feline ff = new Feline(); BarnCat b = new BarnCat(); Robot r = new Robot(); if(af instanceof Animal) Systemoutprint("1 "); if(af instanceof BarnCat) Systemoutprint("2 "); if(b instanceof Animal) Systemoutprint("3 "); if(ff instanceof BarnCat) Systemoutprint("4 "); if(r instanceof Animal) Systemoutprint("5 "); } }
What is the result A 1 B 1 3 C 1 2 3 D 1 3 4
Practice Exam 3: Answers
E F
1 2 3 4 Compilation fails
G An exception is thrown at runtime Answer (for Objective 76): B is correct Line 12 and line 14s instanceof tests fail because BarnCat is not a superclass of either af or ff s respective objects Line 15 compiles because it s possible that Robot could, at some point, implement Animal A, C, D, E, F, and G are incorrect based on the above
36 Given:
2 3 4 5 6 7 8 9 10 11 12 13 14 15 public class Sunny extends Weather { public static void main(String[] args) { try { new Sunny()do1(); new Sunny()do2(); new Sunny()do3(); } catch(Throwable t) { Systemoutprint("exc "); } } } class Weather { void do1() { Systemoutprint("do1 "); } private void do2() { Systemoutprint("do2 "); } protected void do3() { Systemoutprint("do3 "); } }
What is the result A do1 exc B do1 do2 exc C do1 do2 do3 D Compilation fails E An exception is thrown at runtime
Answer (for Objective 71): D is correct Even a subclass can t access a superclass s private method A, B, C, and E are incorrect based on the above
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