1Z0-808 practice questions 91–100

1. Question 91 · 200 in bank

   Given the class definitions: class C1 {} class C2 extends C1 {} class C3 extends C2 {} and the code fragment: 16. C1 obj1 = (C1) new C2(); 17. C2 obj2 = (C2) new C3(); 18. C2 obj3 = (C2) new C1(); 19. C3 obj4 = (C3) obj2; Which line throws ClassCastException?

   • Aline 18
   • Bline 17
   • Cline 19
   • Dline 16

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   Answer: A

   Explanation

   class CC1 { } class CC2 extends CC1 { } public class CC3 extends CC2 { public static void main(String[] args) { CC1 obj1 = (CC1) new CC2(); CC2 obj2 = (CC2) new CC3(); CC2 obj3 = (CC2) new CC1(); // ClassCastException CC3 obj4 = (CC3) obj2; } } /* Exception in thread "main" java.lang.ClassCastException: class questions.CC1 cannot be cast to class questions.CC2 (questions.CC1 and questions.CC2 are in unnamed module of loader 'app') at questions.CC3.main(CC3.java:18) */ Answer is A

   Source: Adapted from community discussion — UAK94

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2. Question 92 · 200 in bank

   Select 2

   Which two features can be implemented in a Java application by encapsulating the entity classes used? (Choose two.)

   • Adata validation
   • Bcompile time polymorphism
   • Cdata hiding
   • Ddata abstraction
   • Edata memory optimization

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   Answer: CD

   Explanation

   CD is the basic answer. we also went through this question in my course and I feel there is nothing to talk about here...

   Source: Adapted from community discussion — Ericausdresden

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3. Question 93 · 200 in bank

   Given the code fragment:

   

   What is the result?

   • AThe sum of 4 numbers is: 10
   • BA compile time error occurs.
   • CThe sum of 5 numbers is: 10
   • DThe sum of 5 numbers is: 15

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   Answer: B

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4. Question 94 · 200 in bank

   Given the code fragment:

   

   What is the result?

   • A[JavaForum, ExpertForum]
   • B[JavaGroup, ExpertGroup]
   • C[JavaForumGroup, ExpertForumGroup]
   • D[JavaGroup, TechGroup ExpertGroup]

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   Answer: B

   Explanation

   The answer is the letter B, the "forEach" method does the concatenation and the "replaceAll" method replaces the last concatenation with the argument you pass. I tested the code: public static void main (String[] args) { List arrayList = new ArrayList<>(); arrayList.add("Tech"); arrayList.add("Expert"); arrayList.set(0, "Java"); arrayList.forEach(a -> a.concat("Forum")); arrayList.replaceAll(s -> s.concat("Group")); System.out.println(arrayList); }

   Source: Adapted from community discussion — iSnover

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5. Question 95 · 200 in bank

   Select 2

   Which two initialization statements are valid? (Choose two.)

   • ABoolean available = ג€TRUEג€:
   • BString tmpAuthor = author, author =ג€Mc Donaldג€;
   • CDouble price = 200D;
   • DInteger pages = 20;

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   Answer: CD

   Explanation

   Reference: http://www.functionx.com/java/Lesson06.htm

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6. Question 96 · 200 in bank

   Examine the given definitions:

   

   and the code fragment:

   

   Which statement is true about the implementation of Object-Oriented Programming concepts in the given code?

   • APolymorphism, abstraction, and encapsulation are implemented.
   • BOnly polymorphism and inheritance are implemented.
   • CPolymorphism, inheritance, and abstraction are implemented.
   • DOnly inheritance and encapsulation are implemented.

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   Answer: A

   Explanation

   The answer should be A as the encapsulation is done by .setPlayers and setting the players list as private, thus hiding the data. There is no inheritance as Game only implements, but not extends, the interface

   Source: Adapted from community discussion — alex_au

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7. Question 97 · 200 in bank

   Which statement is true about the switch statement?

   • AIt must contain the default section.
   • BThe break statement, at the end of each case block, is optional.
   • CIts case label literals can be changed at runtime.
   • DIts expression must evaluate to a collection of values.

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   Answer: B

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8. Question 98 · 200 in bank

   Given the code fragment:

   

   Which modification enables the code to print 54321?

   • AReplace line 6 with System.out. print (--x) ;
   • BAt line 7, insert x --;
   • CReplace line 6 with --x; and, at line 7, insert System.out.print (x);
   • DReplace line 12 with return (x > 0) ? false: true;

   Show answer

   Answer: B

   Explanation

   answer is B, Sur la ligne 12 du programme, l'utilisation de "x--" dans la méthode isAvailable n'affecte pas la variable x de la méthode principale, car Java est toujours "pass by value". L'option A fera la sortie "43210". Option B, vous pouvez générer avec succès "54321". Option C, cette logique est la même que l'option A. L'option D, tant que la boucle ne sera pas exécutée.

   Source: Adapted from community discussion — Mamlouk_Med

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9. Question 99 · 200 in bank

   Given:

   

   What is the result?

   • Atrue
   • Bfalse
   • C-1
   • D0

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   Answer: C

   Explanation

   The answer is C. even p1 having the same content as lst[0], they are different objects so it will return "-1" which is what it returns when we use the "indexOf" constructor and we don't find anything equal to the parameter we used.

   Source: Adapted from community discussion — iSnover

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10. Question 100 · 200 in bank

    Given the code fragment:

    

    You want the code to print: Sold: 5 items. Stock in Hand: 5 - Purchased: 5 items. Stock in Hand: 10? Which action enables the code to print this?

    • ADeclare the stock variable and the purchase(), sell(), and printStock() methods static.
    • BDeclare the stock variable and the printStock() method static.
    • CDeclare the stock and qty variables and the printStock() method static.
    • DDeclare the stock variable static.

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    Answer: C

    Explanation

    To test: class StockRoom { private int stock = 10; public void purchase(int qty) { stock += qty; } public void sell (int qty) { stock -= qty; } public void printStock (String action) { System.out.println( action + ":" + qty + " items. Stock in Hand: " + stock); // qty needs to be static variable to compile. } } public class Test { public static void main(String[] args) { StockRoom k1 = new StockRoom(); k1.sell(5); k1.printStock("Sold"); StockRoom k2 = new StockRoom(); k2.purchase(5); k2.printStock("Purchased"); } }

    Source: Adapted from community discussion — carloswork

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1Z0-808 practice, question 91. 200 questions available.