1Z0-808 practice questions 171–180

1. Question 171 · 200 in bank

   Select 2

   Given the code fragment:

   

   And given the requirements: 1. Process all the elements of the array in the order of entry. 2. Process all the elements of the array in the reverse order of entry. 3. Process alternating elements of the array in the order of entry. Which two statements are true? (Choose two.)

   • ARequirements 1, 2, and 3 can be implemented by using the enhanced for loop.
   • BRequirements 1, 2, and 3 can be implemented by using the standard for loop.
   • CRequirements 2 and 3 CANNOT be implemented by using the standard for loop.
   • DRequirement 1 can be implemented by using the enhanced for loop.
   • ERequirement 3 CANNOT be implemented by using either the enhanced for loop or the standard for loop.

   Show answer

   Answer: BD

   Explanation

   The Correct options are BD. I'm gonna explain: A -> Wrong, because enhanced for cannot read collections in reverse and alternately, it loops through each element and only in an ascending way. B -> Correct, with standard for you can go through elements of a collection in ascending, descending and alternating ways. C -> Wrong, you can loop backwards through an i-- in the third parameter of your for with the correct condition and you can also access collections alternately instead of putting "i++" in the third parameter of the standard for you, you can put the expression "i = i + 2" or any other number you want in place of 2. D -> Correct, an enhanced for processes all elements of an array in input form. E -> Wrong, you can do it alternately with a standard for as I explained in alternative C.

   Source: Adapted from community discussion — iSnover

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2. Question 172 · 200 in bank

   Given:

   

   What is the result?

   • A400 200
   • B200 200
   • C400 400
   • DCompilation fails.

   Show answer

   Answer: A

   Explanation

   Antwort A , ist richtig : public static void main(String[] args) { int var1 = 200; System.out.println(doCalc(var1)); System.out.println(" " + var1); } static int doCalc(int var1) { var1 = var1 * 2; return var1; } } 400 200

   Source: Adapted from community discussion — dya45792

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3. Question 173 · 200 in bank

   Given the following class declarations: ✑ public abstract class Animal ✑ public interface Hunter ✑ public class Cat extends Animal implements Hunter ✑ public class Tiger extends Cat Which answer fails to compile?

   

   • AOption A
   • BOption B
   • COption C
   • DOption D
   • EOption E

   Show answer

   Answer: D

   Explanation

   This is the explanation I got for option E, Found it silly though :- "Look at the right side of the declaration ArrayLIst() rather than ArrayList "

   Source: Adapted from community discussion — MintyUikey

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4. Question 174 · 200 in bank

   Which statement is true about Java byte code?

   • AIt can run on any platform.
   • BIt can run on any platform only if it was compiled for that platform.
   • CIt can run on any platform that has the Java Runtime Environment.
   • DIt can run on any platform that has a Java compiler.
   • EIt can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.

   Show answer

   Answer: C

   Explanation

   Correct answer should be C . Because bytecode is already compiled hence again you don't need compiler. Now you only need JRE to run that bytecode.

   Source: Adapted from community discussion — Ru_H33

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5. Question 175 · 200 in bank

   Given:

   

   How many MarkList instances are created in memory at runtime?

   • A1
   • B2
   • C3
   • D4

   Show answer

   Answer: A

   Explanation

   like atlassi708 said, the new keyword is only used once. The other ways are not valid ways to create a new Java Object instance.

   Source: Adapted from community discussion — Anton2020

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6. Question 176 · 200 in bank

   Given:

   

   What is the result?

   • AArea is 6.0
   • BArea is 3.0
   • CCompilation fails at line n1
   • DCompilation fails at line n2.

   Show answer

   Answer: A

   Explanation

   Answer is A. public class Triangle { static double area; int b=2, h=3; public static void main(String[] args) { double p,b,h; if (area==0) { b=3; h=4; p=0.5; area=p*b*h; } System.out.println(area); } }

   Source: Adapted from community discussion — UAK94

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7. Question 177 · 200 in bank

   Select 3

   Given the code fragment:

   

   Which three code fragments can be independently inserted at line n1 to enable the code to print One? (Choose three.)

   • Abyte x = 1;
   • Bshort x = 1;
   • CString x = "1";
   • Dlong x = 1;
   • Edouble x = 1;
   • FInteger x = new Integer("1");

   Show answer

   Answer: ABF

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8. Question 178 · 200 in bank

   Given:

   

   And given the code fragment:

   

   What is the result?

   • A4W 100 Auto 4W 150 Manual
   • Bnull 0 Auto 4W 150 Manual
   • CCompilation fails only at line n1
   • DCompilation fails only at line n2
   • ECompilation fails at both line n1 and line n2

   Show answer

   Answer: A

   Explanation

   Answer is A. To test: package teste; class Vehicle{ String type = "4W"; int maxSpeed = 100; Vehicle(String type, int maxSpeed){ //Construtor da classe Pai this.type=type; this.maxSpeed=maxSpeed; } Vehicle(){} // Construtor Default } // fim da classe Vehicle public class Car extends Vehicle{ String trans; Car(String trans){ //line n1 this.trans = trans; } Car(String type, int maxSpeed, String trans){ super(type, maxSpeed); //line n2 this.trans = trans; } public static void main(String[] args) { Car c1=new Car("Auto"); Car c2=new Car("4W", 150, "Manual"); System.out.println(c1.type + " " +c1.maxSpeed + " " + c1.trans); System.out.println(c2.type + " " +c2.maxSpeed + " " + c2.trans); } // Fim da main } // Fim da class Car

   Source: Adapted from community discussion — carloswork

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9. Question 179 · 200 in bank

   Given:

   

   What is the result?

   • ATrue false
   • BTrue null
   • CCompilation fails
   • DA NullPointerException is thrown at runtime

   Show answer

   Answer: A

   Explanation

   new Boolean(null) will call the construcor : public Boolean(String s) { this(parseBoolean(s)); } public static boolean parseBoolean(String s) { return ((s != null) && s.equalsIgnoreCase("true")); } So the returned value will be false. The answer is A

   Source: Adapted from community discussion — this_nickname

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10. Question 180 · 200 in bank

    Given the following code for the classes MyException and Test:

    

    What is the result?

    • AA
    • BB
    • CEither A or B
    • DA B
    • EA compile time error occurs at line n1

    Show answer

    Answer: B

    Explanation

    correct answer is B class MyException extends RuntimeException{} public class Test{ public static void main(String[] args) { try { method1(); } catch (MyException e) { System.out.println("A"); } } public static void method1() { try { throw new MyException(); } catch (RuntimeException e) { System.out.println("bb"); } } }

    Source: Adapted from community discussion — JongHwa

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1Z0-808 practice, question 171. 200 questions available.