1Z0-829 practice questions 21–30

1. Question 21 · 52 in bank

   Which statement is true about migration?

   • AEvery module is moved to the module path in a bottom-up migration.
   • BEvery module is moved to the module path in a top-down migration.
   • CUnnamed modules are automatic modules in a top-down migration.
   • DThe required modules migrate before the modules that depend on them in a top-down migration.

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   Answer: B

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2. Question 22 · 52 in bank

   Daylight Saving Time (DST) is the practice of advancing clocks at the start of spring by one hour and adjusting them backward by one hour in autumn. Considering that in 2021, DST in Chicago (Illinois) ended on November 7th at 2 AM, and given the fragment:

   

   What is the output?

   • Atrue true
   • Bfalse true
   • Ctrue false
   • Dfalse false

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   Answer: C

   Explanation

   package q03; import java.time.LocalDate; import java.time.LocalTime; import java.time.ZoneId; import java.time.ZonedDateTime; public class Q03 { public static void main(String[] args) { ZoneId zoneId = ZoneId.of("America/Chicago"); ZonedDateTime zdt = ZonedDateTime.of( LocalDate.of(2021, 11, 7), LocalTime.of(1, 30), zoneId ); ZonedDateTime anHourLater = zdt.plusHours(1); System.out.println(zdt.getHour() == anHourLater.getHour()); System.out.print(zdt.getOffset().equals(anHourLater.getOffset())); } } // Result: // true // false

   Source: Adapted from community discussion — james2033

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3. Question 23 · 52 in bank

   Assuming that the data.txt file exists and has the following content: text1 text2 text3 Given the code fragment:

   

   What is the result?

   • Atext1- text2- text3- text3
   • Btext1-text2-text3 A java.lang.IndexOutOfBoundsException is thrown.
   • Ctext1-text2-text3 text1 text2 text3
   • Dtext1-text2-text3 text3

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   Answer: B

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4. Question 24 · 52 in bank

   Given:

   

   Which action enables the code to compile?

   • AReplace 2 with static String name;
   • BReplace 7 with public static void display(String design) {
   • CReplace 3 with private static void display() {
   • DReplace 15 with Item.display("Flower");

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   Answer: A

   Explanation

   Correct answer is A, tested in online compiler. static methods cannot access instance variable unless they are static. That is to say: - either the "name" variable must be made static so that it can be accessed by the display() method on line 3 - or the display() method on line 3 must be made non-static (remove the static keyword) so that it can access the "name" variable Only alternative that achieves one of these two is A. Note that despite this change, i1.display("Flower") will still call the display() method on line 7. Non-static methods are allowed to access static instance variable regardless. In this case, since both "this.name" and "name" are null, "this.name += name;" will simply do "null += null;" and the result will be "nullnull".

   Source: Adapted from community discussion — supersquax

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5. Question 25 · 52 in bank

   Given:

   

   and the code fragment:

   

   What is the result?

   • AMarketing
   • BMarketing - Finance - Technical
   • CMarketing - UnDefined
   • DUnDefined

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   Answer: A

   Explanation

   package q33; import java.util.Arrays; public class Q33 { public static void main(String[] args) { Arrays.stream(Desig.values()).dropWhile(s -> s.equals(Desig.CMO)); switch (Desig.valueOf("CMO")) { case CEO -> System.out.println("Executive"); case CMO -> System.out.println("Marketing"); case CFO -> System.out.println("Finance"); case CTO -> System.out.println("Technical"); default -> System.out.println("UnDefined"); } } } // Result: // Marketing

   Source: Adapted from community discussion — james2033

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6. Question 26 · 52 in bank

   Given:

   

   What is the result?

   • AB A D
   • BD A D
   • CB A C
   • DD D D

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   Answer: B

   Explanation

   package q34; public class Test { public void sum(int a, int b) { System.out.print(" A"); } public void sum(int a, float b) { System.out.print(" B"); } public void sum(float a, float b) { System.out.print(" C"); } public void sum(double... a) { System.out.print(" D"); } public static void main(String[] args) { Test t = new Test(); t.sum(10, 15.25); t.sum(10, 24); t.sum(10.25, 10.25); } } // Result: // D A D

   Source: Adapted from community discussion — james2033

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7. Question 27 · 52 in bank

   Given:

   

   What is the result?

   • Arunsruns
   • Bflipsruns
   • Crunsflips
   • DCompilation fails.
   • Eflipsflips

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   Answer: B

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8. Question 28 · 52 in bank

   Select 2

   Given:

   

   Which two method invocations execute? (Choose two.)

   • Anew MyC().m2();
   • BIFace.m4();
   • CIFace myClassObj = new MyC(); myClassObj.m3();
   • DIFace myClassObj = new MyC(); myClassObj.m4();
   • EIFace.m3();
   • FIFace.m2();

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   Answer: AE

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9. Question 29 · 52 in bank

   Select 2

   Given the directory structure:

   

   Given the definition of the Doc class:

   

   Which two are valid definitions of the WordDoc class? (Choose two.)

   • Apackage p1.p2; public non-sealed class WordDoc extends Doc { }
   • Bpackage p1; public final class WordDoc extends Doc {}
   • Cpackage p1; non-sealed abstract class WordDoc extends Doc {}
   • Dpackage p1.p2: public sealed class WordDoc extends Doc { }
   • Epackage p1; public class WordDoc extends Doc {}
   • Fpackage p1; public non-sealed class WordDoc extends Doc {}

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   Answer: BF

   Explanation

   A wrong cuz "package p1.p2" doesnt make sense B correct C wrong cuz no access modifier is more restrictive than public and not allowed. D wrong cuz when using "sealed", one must also use "permits" E wrong cuz missing "sealed", "non-sealed", or "final" F correct.

   Source: Adapted from community discussion — supersquax

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10. Question 30 · 52 in bank

    Given:

    

    What is the result?

    • ACompilation fails.
    • BwTablewChair TableChair
    • CTableChair TableChair
    • DA RuntimeException is thrown.
    • EwTableChair TableChair

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    Answer: B

    Explanation

    A This code has a compilation error because the reduce method expects elements of the same type as the accumulator function's arguments.

    Source: Adapted from community discussion — xplorerpj

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1Z0-829 practice, question 21. 52 questions available.