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OCP Oracle Certified Professional Java SE 11 Developer Practice Tests Exam 1Z0 819 And Upgrade Exam 1Z0 817 1st Edition Scott Selikoff, Jeanne Boyarsky - Solutions
Which of the following are marker annotations? (Choose three.)A. @TargetB. @InheritedC. @OverrideD. @RetentionE. @RepeatableF. @Documented.
Given the following declarations, which annotations can fill in the blank that would allow the code to compile? (Choose three.) A. @Music(super="piccolo")B. @Music("viola")C. @Music(value()="bass")D. @MusicE. @Music(default="flute")F. @Music(value="cello") public @interface Music { String
An annotation cannot be applied to which of the following?A. Class declaration.B. Annotation declaration.C. Inner class declaration.D. Cast operation.E. Local variable declaration using var. F. An annotation can be applied to all of the above.
Assume the following code compiles. Which annotation inserted in the line allows the code to print a non-null value at runtime? A. @InheritedB. @PolymorphismC. @InheritanceD. @RetentionE. @SubclassF. None of the above. // INSERT HERE @interface Fast { } int topSpeed () default 10; @Fast
Which statements about the @Override annotation are correct? (Choose three.)A. It can be optionally specified when a class implements an abstract interface method.B. Adding it to a method may trigger a compiler error.C. It is required whenever a class implements an abstract interface
How many lines of the following declaration contain a compiler error? A. NoneB. OneC. TwoD. ThreeE. FourF. Five. 1: public @interface Student { 2: 3: 4: 5: 6: 7: } final boolean likesPonies = true; int value default 100; int age(); /** TODO **/ String name () default "Olivia";
Which of the following are permitted to be used for annotation element type? (Choose three.)A. ObjectB. An annotationC. Class[]D. An enumE. DoubleF. var.
Fill in the blanks with the lines of code that allow the program to compile. (Choose two.) A. Presents on line t1B. @Presents on line t1C. Gift value() on line t2D. Presents.class on line t1E. Gift[] value() on line t2F. Gift[] gift() on line t2. import java.lang.annotation. *; _) // t1
Which statements about annotations are correct? (Choose three.)A. Annotations contain data that changes throughout the program execution.B. Adding an annotation to a class that already compiles may trigger a compiler error and cause it to fail to compile.C. Annotations contain metadata about a
Which annotation can be applied to an existing annotation X and ensures a class that uses X shows the annotation in its generated Javadoc?A. @DocumentedB. @GeneratedC. @JavaDocD. @PreserveAnnotationsE. @RetentionF. None of the above
Which method declarations can @SafeVarargs be correctly applied to? (Choose two.) A. protected void hum(double... tune)B. final int whistle(int length, float... measure)C. static void sing()D. private void listen(String... mp3)E. void dance(List... beat)F. private static int play(int[]
Given the following declarations, which annotations can fill in the blank that would allow the code to compile? (Choose three.) A. @Vacuum({})B. @Vacuum({"upright","new"})C. @Vacuum(List.of("portable"))D. @VacuumE. @Vacuum("handheld")F. @Vacuum(default="shop") import java.util.*; public
Which of the following are considered locales? (Choose three.)A. Cultural regionB. Local addressC. CityD. Time zone regionE. Political regionF. Geographical region.
Assuming the key green is in all five of the files referenced in the options, which file will the following code use for the resource bundle?A. Colors_default.propertiesB. Colors.propertiesC. Colors_en.propertiesD. Colors_US.propertiesE. Colors_en_US.propertiesF. None of the above.
When localizing an application, which type of data varies in presentation depending on locale?A. CurrenciesB. DatesC. BothD. Neither
How do you find out the locale of the running program?A. Locale.get("default")B. Locale.get(Locale.DEFAULT)C. Locale.of()D. Locale.now()E. Locale.getDefault()F. None of the above
What is the output if the solveMystery() method is applied to a Properties object loaded from mystery.properties? A. bag ? trickB. bag ? nullC. bag null nullD. bag null trickE. The code does not compile.F. An exception is thrown at runtime. mystery.properties mystery-bag type=paper void
How long will the effects of calling Locale.setDefault() be active assuming no other calls to that method are made?A. Until the end of the method.B. Until the program exits.C. Until the next reboot of the computer.D. It persists after reboot.E. None of the above.
Given the following four properties files, what does this code print? A. null null nullB. engine 241 USC. moteur 45 USD. engine 241 earthE. moteur 241 earthF. An exception is thrown at runtime. Cars_en.properties engine-engine horses=241 Cars_en_US.properties country=US horses=45
Fill in the blank so the code correctly compiles and creates a Locale reference.Locale loc = Locale.____________________;A. get("Italian")B. of(Locale.ITALIAN)C. get(Locale.ITALIAN)D. getLocale("Italian")E. of("Italian")F. None of the above.
Assuming the key turquoise is in all five of the files referenced in the options, which file will the following code use for the resource bundle?A. Colors_en.propertiesB. Colors_CN.propertiesC. Colors.propertiesD. Colors_default.propertiesE. Colors_en_CN.propertiesF. None of the above. Locale
How many lines does the following print out? A. Only an exception is printed.B. One, followed by an exception.C. Two, followed by an exception.D. Three.E. It does not compile. 3: Locale.setDefault (Locale. KOREAN); 4: System.out.println(Locale.getDefault()); 5: Locale.setDefault(new Locale
Assuming the key red is in all five of the files referenced in the options, which file will the following code use for the resource bundle? A. Colors.propertiesB. Colors_en_US.propertiesC. Colors_US.propertiesD. Colors_ES.propertiesE. Colors_ca.propertiesF. None of the above.
What is the output if the launch() method is applied to a Properties object loaded from scifi.properties? A. saturn5 null ?B. saturn5 null nullC. null null ?D. saturn5 ? ?E. The code does not compile.F. An exception is thrown at runtime. scifi.properties rocket-saturn5 moon=landing void
For what values of pattern will the following print ? (Choose two.)A. ##,00.##B. ##,00.#C. 0,00.#D. #,00.#E. 0,00.0F. #,##.# String pattern _"; var message = DoubleStream.of (2.1, 6.923, 1000) .mapToobj (v -> new DecimalFormat (pattern). format (v)) .collect (Collectors.joining (">
What is the result of the following? A. hammer nailB. The code does not compile due to line p1.C. The code does not compile due to line p2.D. The code does not compile due to line p3.E. An exception is thrown at runtime.F. None of the above. Map map = new TreeMap (); map.put("tool",
Which of the following are not valid Locale formats? (Choose two.)A. nl_BEB. fr_CAC. uk_uaD. CRE. noF. ro_RO
Given the following two properties files, what does the following class output? A. Docker containerB. generic containerC. generic nullD. The output cannot be determined without knowing the locale of the system where it will be run.E. An exception is thrown at runtime.F. None of the above.
Assuming the Forest.properties file is the only resource file available, what is the output of calling the hike() method? A. treesB. trees prettyC. trees {0}D. trees nullE. The code does not compile.F. An exception is thrown at runtime. Forest.properties trees-evergreen {0} animals-squirrels
What is the most likely outcome of this code if the bunnies table is empty? A. One row is in the table.B. Two rows are in the table.C. The code does not compile.D. The code throws a SQLException. var url="jdbc:derby:bunnies"; var sql "INSERT INTO bunny (name, color) VALUES (?, ?)"; try (var
Fill in the blank with the option that allows the code snippet to compile and print a message without throwing an exception at runtime. A. f.formatDate(x)B. f.formatDate(y)C. f.format(x)D. f.format(y)E. The code does not compile regardless of what is placed in the blank.F. None of the above.
Which of the following are valid locale formats? (Choose two.) A. hiB. hi_INC. IN_hiD. in_hiE. HI_INF. IN
Assuming the key indigo is in all five of the files referenced in the options, which file will the following code use for the resource bundle? A. Colors_default.propertiesB. Colors_en_US.propertiesC. Colors_CH.propertiesD. Colors_en.propertiesE. Colors_es.propertiesF. None of the above.
For currency, the US uses the $ symbol, the UK uses the £ symbol, and Germany uses the € symbol. Given this information, what is the expected output of the following code snippet? A. $1.10B. 1,10€C. £1.10D. The code does not compile.E. An exception is thrown at runtime.F. The output
Assuming the key purple is in all five of the files referenced in the options, which file will the following code use for the resource bundle? A. Colors_en_US.propertiesB. Colors_en.propertiesC. Colors_US.propertiesD. Colors_fr.propertiesE. Colors.propertiesF. None of the above.
For currency, the US uses the $ symbol, the UK uses the £ symbol, and Germany uses the € symbol. Given this information, what is the expected output of the following code snippet?A. $6.95B. 6,95 €C. £6.95D. The code does not compile.E. An exception is thrown at runtime.F. The output
Which statement best describes this class? A. It can be serialized.B. It is well encapsulated.C. It is immutable.D. It is both well encapsulated and immutable.E. None of the above as the code does not compile. import java.util.*; public final class Forest { private final int flora; private
Fill in the blanks: The ___________ class variable defines a whitelist of fields that should be serialized, while the ___________ modifier is used to construct a blacklist of fields that should not be serialized. (Choose two.)A. serialVersionUID in the first blankB. serialFields in the first
Which statement best describes the following method? A. It is not susceptible to any common attacks.B. It is at risk of SQL injection attack only.C. It is at risk of a denial of service attack only.D. It is at risk of both SQL injection and denial of service attacks.E. The method does not
Fill in the blanks: ____________ means the state of an object cannot be changed, while _____________ means that it can.A. Encapsulation, factory method.B. Immutability, mutabilityC. Rigidity, flexibilityD. Static, instance.E. Tightly coupled, loosely coupledF. None of the above.
Which of the following best protect against denial of service attacks? (Choose three.)A. Close resources with catch blocks.B. Use PreparedStatement instead of Statement.C. Close resources with try-with-resources statements.D. Set a limit of the size of a file upload.E. Set a limit on the size
You ask to borrow one of your friend’s recipe cards. Which statements about these cards, represented as Java policy file grants, are correct? (Choose two.) A. The policy syntax of the policy file is correct.B. The policy syntax of the policy file is incorrect.C. The policy is incorrect
Which of the following best protect against inclusion attacks? (Choose two.)A. Encrypt user passwords.B. Use immutable objects.C. Limit the recursive depth of ZIP files.D. Apply a blacklist to the input data.E. Turn the computer off when not in use.F. Restrict the number of parse levels of
What changes, taken together, would make the Tree class immutable? (Choose three.) A. Make all constructors private.B. Change the access level of species to private.C. Change the access level of species to protected.D. Remove the setSpecies() method.E. Mark the Tree class final.F. Make a
Which techniques best prevent sensitive objects from being manipulated by an attacker who wants to create a malicious subclass? (Choose three.)A. Add final to the class declaration.B. Set protected as the access level for all method declarations.C. Add final to all method declarations.D. Add
Which statement best describes the following method? A. It is not susceptible to any common attacks.B. It is at risk of SQL injection attack only.C. It is at risk of a denial of service attack only.D. It is at risk of both SQL injection and denial of service attacks.E. The method does not
Which statements about executing the following program are correct? (Choose two.) A. Line p1 makes the code susceptible to tainted inputs from the user.B. Line p2 makes the code susceptible to tainted inputs from the user.C. Line p3 makes the code susceptible to tainted inputs from the
How do you change the value of an instance variable in an immutable class?A. Call the setter method.B. Remove the final modifier and set the instance variable directly.C. Create a new instance with an inner class.D. Use a method other than Option A, B, or C.E. You can’t.
Let’s say you want to serialize the following class, but only want the flour quantity saved. What changes, if any, are required to the following class for this to occur? A. No changes are required.B. Mark eggs and sugar as transient.C. Remove the serialPersistentFields variable.D. Remove the
Which are true about closing resources to guard against a denial of service attack? (Choose two.) A. The NIO.2 Files.lines() method does not require closing a resource when it is used in a stream pipeline.B. The NIO.2 Files.lines() method requires closing a resource when it is used in a stream
Which type of attack requires more than one source to initiate?A. Billion laughs attackB. Million frowns attackC. Distributed denial of service attackD. SQL injectionE. Inclusion attackF. Denial of service attack.
What is this class an example of? A. TurquoiselistB. WhitelistC. OrangelistD. BlacklistE. Both blacklist and whitelistF. None of the above import java.util.*; public class Nightclub { private List approved // IMPLEMENTATION OMITTED private List rejected = // IMPLEMENTATION OMITTED public
Which statements about the clone() method are correct? (Choose two.)A. Calling clone() on a class that does not implement Cloneable results in a compiler error.B. Calling clone() on a class that does not implement Cloneable results in an exception at runtime.C. If a class implements Cloneable
Which statements about securing confidential information are correct? (Choose three.)A. When writing to System.out, you should not include sensitive information.B. When reading sensitive data from a Console, you should use readLine().C. When throwing an exception, it is acceptable to include
What are the best scenarios for customizing the serialization process? (Choose two.)A. To prevent SQL injection.B. To shuffle data among users.C. It is the only way to prevent a sensitive field like birthdate from being written to disk.D. To improve performance by applying advanced optimization
Select a good strategy for handling input validation failures?A. Use the assert statement.B. Throw an Error.C. Log an error but allow the user to continue.D. Throw an Exception.E. Shut down the computer.F. None of the above.
Which statements about executing the following program are correct? (Choose two.) A. Line m1 makes the code susceptible to tainted inputs from the user.B. Line m2 makes the code susceptible to tainted inputs from the user.C. The code is not susceptible to tainted inputs from the user.D. The
Which can fill in the blank to make this code compile? A. GetObjectB. ReadFieldC. FetchItemD. ReadItemE. GetFieldF. None of the above. import java.io.*; public class Pony implements Serializable { private static final ObjectStreamField [] serial PersistentFields = { new ObjectStreamField
Which statement about the following classes is correct? A. Only Flower is immutable.B. Only Plant is immutable.C. Both classes are immutable.D. Neither class is immutable.E. None of the above as one of the classes does not compile. import java.util.*; public class Flower { private final
Which of the following can cause an injection attack? (Choose two.)A. Access controlB. Command line inputC. Constants in the programD. Mutable codeE. SerializationF. XML parsing.
Assuming this class is passed a valid non-negative integer, which statements best describe the following class? (Choose two.) A. It is well encapsulated.B. It is susceptible to a denial of service attack.C. It creates an immutable object.D. It is susceptible to an inclusion attack.E. It is
In which scenario is it appropriate for confidential information to be used? A. Writing to a log fileB. Printing a stack traceC. Outputting to System.errD. Storing in a StringE. Writing an unsecure emailF. None of the above.
What statements about the following method are correct? (Choose three.) A. It protects against a denial of service attack.B. It does not protect against denial of service attacks.C. It protects against SQL injection.D. It does not protect against SQL injection because it does not use a
Which statement best describes this class? A. It can be serialized.B. It is well encapsulated.C. It is immutable.D. It is both well encapsulated and immutable.E. None of the above as the code does not compile. import java.util.*; public final class Ocean { private final List algae; private
Which are true about this class? (Choose three.) A. It is able to be serialized.B. It is not able to be serialized.C. It is well encapsulated.D. It is not well encapsulated.E. It is immutable.F. It is not immutable. import java.io.*; import java.util.*; public final class Forest implements
You’ve been hired by Charlie Sweets to perform a security audit of their login system. After reviewing the following code, what recommendations would best improve the security of their system? (Choose three.) A. Mark the check() method final on line 2.B. Remove the null check on line
Fill in the blanks with the proper method names to serialize an object. (Choose two.) A. readResolve in the first blankB. writeReplace in the first blankC. writeObject in the first blankD. writeObject in the second blankE. readObject in the second blankF. writeReplace in the second blank.
Your co-worker has called you in the middle of the night to report all the servers have been compromised and have run out of memory. After some debugging, it seems like the attacker exploited a file upload resource, but you aren’t sure how since the endpoint has a small maximum file size limit.
Which statements about the following class are correct? (Choose three.) A. Line h1 properly validates security.B. Line h1 presents an unacceptable security risk.C. Line h2 elevates security privileges.D. Line h2 does not elevate security privileges.E. Line h3 violates security guidelines by
For which value of name will this code result in a successful SQL injection attack? A. DELETE TABLE records;B. 'Olivia'; DELETE TABLE recordsC. 'Sophia; DELETE TABLE recordsD. 'Elysia'; DELETE TABLE recordsE. ?; DELETE TABLE records;F. None of the above. public Integer getScore (String
Which are requirements for a class to be immutable? (Choose three.)A. A private constructor is provided.B. Any instance variables are private.C. Any instance variables are initialized in a constructor.D. Methods cannot be overridden.E. There are no setter methods.F. Any instance variables are
Which of the following are not typically considered denial of service attacks? (Choose two.)A. Downloading confidential information from a log fileB. Uploading a very large fileC. Performing SQL injection.D. Passing invalid numbers to trigger overflow or underflow.E. Exploiting a database
The following code prints false. Which statements best describe the Fruit class? (Choose three.) A. It does not implement Cloneable.B. It performs a deep copy.C. It performs a shallow copy.D. It overrides clone().E. It implements Cloneable.F. It does not override clone(). var original= new
What are the best ways to prevent SQL injection? (Choose two.)A. Avoid SQL statements that take query parameters.B. Log an error anytime a SQL injection attack is successful.C. Avoid concatenating user input into a query string.D. Ensure database resources are closed.E. Always use a
What is the result of the following? A. 2B. 18C. 19D. 110E. The code does not compile. } import static java.util.stream.Collectors. *; import } class Ballot { private String name; private int judgeNumber; private int score; java.util.stream.Stream; public Ballot (String name, int judgeNumber,
Which of the following can fill in the blank to have the code print 44? A. Only mapB. Only mapToIntC. Only mapToObject.D. Both map and mapToIntE. Both map and mapToObjectF. map, mapToInt, and mapToObject. var stream = Stream. of ("base", "ball"); stream. (s -> s.length()).forEach
What does the following do? (Choose two.) A. If any compiler errors are fixed, it prints true.B. If any compiler errors are fixed, it prints false.C. It compiles without issue.D. It doesn’t compile due to line k1.E. It doesn’t compile due to line k2. public class Shoot { interface Target
Which statements about the following code are correct? A. It consistently prints 6.B. It consistently prints 7.C. It consistently prints another value.D. It does not consistently print the same value on every execution.E. It compiles but throws an exception at runtime.F. None of the above.
What is the result of the following? A. Both statements print 0.B. Both statements print 0.0.C. The statements print different values.D. The code does not compile.E. The code compiles but throws an exception at runtime. 11: var s1 = IntStream.empty(); 12: System.out.print(s1.average ( ).getAs
Which lambdas can replace the method references in this code? (Choose two.) A. x.length()B. x -> x.length()C. x -> x::lengthD. System.out.println(s)E. s -> System.out.println(s)F. s -> System.out::println Stream.of("fish", "mammal", "amphibian") .map (String:: length)
What collector can turn the stream at left to the Map at right? A. Only grouping()B. Only groupingBy()C. Only partitioning()D. Only partitioningBy()E. Both grouping() and partitioning()F. Both groupingBy() and partitioningBy() Sree Ken Kumar Ye Dan true false Sree Ken Kumar Ye Dan
Which expression is compatible with the IntSupplier functional interface? A. () -> 1 {return 1/0;}C. () -> return 4D. System.out::printE. None of the above
What is the output of the following application? A. SavedB. Too farC. The code does not compile because of the main() method.D. The code does not compile because of the saveLife() method.E. None of the above. package beach; import java.util. function. *; class Tourist { public Tourist (double
Given a LinkedList, which method would you call to obtain a parallel stream that uses it as a data source? A. getParallel()B. parallels()C. getParallelStream()D. parallel()E. parallelStream()F. None of the above.
How many lines does the following code output? A. One.B. Two.C. The code does not compile due to line x.D. The code does not compile due to line y.E. The code compiles but throws an exception at runtime. import java.util.*; class Blankie { String color; String getColor() { return color; } } }
Which are true statements? (Choose two.)A. A source cannot return an infinite stream.B. A source may return an infinite stream.C. A source must return an infinite stream.D. An intermediate operation cannot return an infinite stream.E. An intermediate operation may return an infinite
0How many of these lines have compiler errors? A. One.B. Two.C. Three.D. Four.E. Five.F. The code compiles as is. 14: Consumer c1 = ArrayList:: new; 15: Consumer c2 = String: :new; 16: Consumer c3 = System.out::println; 17: var c4 = ArrayList:: new; 18: var c5 = String: : new; 19: var c6 =
What is true of this code? (Choose two.) A. It outputs {true=[true]}.B. It outputs {false=null, true=[true]}.C. It outputs {false=[], true=[true]}.D. It outputs {false=[null], true=[true]}.E. The output is the same if line k is removed.F. The output is different after line k is removed. var
Which functional interface, when filled into the blank, prevents the class from compiling? A. DoubleUnaryOperatorB. FunctionC. IntToLongFunctionD. UnaryOperatorE. All of the above allow the code to compile. package morning; import java.util. function. *; public class Sun { public static void
Which statements about applying forEachOrdered() to a parallel ordered stream instead of using forEach() are correct? (Choose two.).A. The operation will likely be faster.B. The operation will likely be slower.C. There is no expected change in performance.D. It forces some stream operations in
What is the true of the following? (Choose two.) A. The output is 60-0-40B. The output is 60-2-40C. The code does not compile for one reason.D. The code does not compile for two reasons.E. Correct code could be written without summary statistics using a single stream pipeline.F. Correct code
What is a difference between lambdas and method references?A. Only one can take a method parameter.B. Only one can reference an effectively final local variable.C. Only one can make a method call where the method parameter is the hard-coded number 3.D. Only one can use deferred
Following the generate() method, which of the four method calls in this code can be removed and have the method still compile and run without error? A. filter()B. sorted()C. filter() and sorted().D. filter() and ifPresent().E. filter(), sorted(), and ifPresent().F. filter(), sorted(),
What is true of the following? (Choose three.) A. If filling in the blank with method x, the code outputs Caught it.B. If filling in the blank with method x, the code prints a stack trace.C. If filling in the blank with method y, the code outputs Caught it.D. If filling in the blank with
Which statement is not true of Predicate?A. A boolean is returned from the method it declares.B. It is an interface.C. The method it declares accepts two parameters.D. The method it declares is named test.E. All of the above are true.
Which functional interface does not have the correct number of generic arguments?(Choose two.)A. BiFunctionB. BinaryOperatorC. DoubleFunctionD. ToDoubleFunctionE. ToIntBiFunction
How many changes need to be made to the following stream operation to execute a parallel reduction? A. None, it is already a parallel reduction.B. One.C. Two.D. Three.E. The code does not compile.F. None of the above. var r= new Random(); var data = Stream.generate (() ->
What is the output of this code? A. bloatB. BLOATC. oneD. ONEE. The code does not compile due to line x.F. None of the above. Stream.of("one", "two", "bloat") .limit (1) .map (String: :toUpperCase) .sorted () .forEach (System.out::println); // line x
Which lambda expression can be passed to the magic() method? A. (a) -> aB. (b,w) -> (long)w.intValue()C. (c,m) -> {long c=4; return c+m;}D. (Integer d, Integer r) -> (Long)r+dE. None of the above. package show; import java.util. function. *; public class Magician { public void
Fill in the blank: ______________ is the only functional interface that does not involve double, int, or long.A. BooleanSupplierB. CharPredicateC. FloatUnaryOperatorD. ShortConsumerE. None of the above.
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