This page was exported from Valid Premium Exam [ http://premium.validexam.com ] Export date:Thu Sep 19 22:39:43 2024 / +0000 GMT ___________________________________________________ Title: [Mar 15, 2024] 1Z0-829 Dumps Full Questions - Exam Study Guide [Q28-Q43] --------------------------------------------------- [Mar 15, 2024] 1Z0-829 Dumps Full Questions - Exam Study Guide Oracle Java Free Certification Exam Material from ValidExam with 50 Questions Oracle 1Z0-829: Java SE 17 Developer exam is designed for developers who have experience developing enterprise-level applications using Java SE 17. It evaluates a candidate's ability to write efficient, reliable, and scalable code that meets the needs of modern applications. 1Z0-829 exam also covers topics such as object-oriented programming, exception handling, concurrency, and modular programming.   NEW QUESTION 28Given the code fragment:Which two statements at Line nl independently enable you to print 1250?  Integer res = 250 + integer.parseint (s)  Integer res = 250 + s:  Integer res = 250 + integer (s2):  Integer res= 250 + s2;  Integer res = 250 + integer . valueof (s);  Integer res = 250; Res = + s2;Explanation:The code fragment is creating a string variable “s” with the value “10_00” and an integer variable “s2” with the value 10. The string “s” is using an underscore as a separator for readability, which is allowed in Java SE 171. The question is asking for two statements that can add 250 to the numeric value of “s” and assign it to an integer variable “res”. The correct answers are A and E because they use the methods parseInt and valueOf of the Integer class to convert the string “s” to an integer. Both methods interpret the string as a signed decimal integer and return the equivalent int or Integer value23. The other options are incorrect because they either use invalid syntax, such as B and C, or they do not convert the string “s” to an integer, such as D and F. Reference: Binary Literals (The Java™ Tutorials > Learning the Java Language > Numbers and Strings), Integer (Java SE 17 & JDK 17), Integer (Java SE 17 & JDK 17)NEW QUESTION 29Given:  Hello  Compilation fails  A NumberFormatException is thrown  there The code fragment will fail to compile because the parseInt method of the Integer class is a static method, which means that it can be invoked without creating an object of the class. However, the code is trying to invoke the parseInt method on an object of type Integer, which is not allowed. The correct way to invoke the parseInt method is by using the class name, such as Integer.parseInt (s). Therefore, the code fragment will produce a compilation error. Reference: Integer (Java SE 17 & JDK 17) – OracleNEW QUESTION 30Given the product class:And the shop class:What is the result?  Cookie 2.99 2.99  Cookie 3.99 2.99  Cookie 0.0 0.0  An exception is produced at runtime  Compilation fails  Cookie 0.0 2.99 The code fragment will fail to compile because the readObject method in the Product class is missing the @Override annotation. The readObject method is a special method that is used to customize the deserialization process of an object. It must be declared as private, have no return type, and take a single parameter of type ObjectInputStream. It must also be annotated with @Override to indicate that it overrides the default behavior of the ObjectInputStream class. Without the @Override annotation, the compiler will treat the readObject method as a normal method and not as a deserialization hook. Therefore, the code fragment will produce a compilation error. Reference: Object Serialization – Oracle, [ObjectInputStream (Java SE 17 & JDK 17) – Oracle]NEW QUESTION 31Given:What is the result?  User name (US)  The program throws a MissingResourceException.  User name (EN – US)  UserName  User name (EN) ExplanationThe answer is B because the code fragment contains a logical error that causes a MissingResourceException at runtime. The code fragment tries to load a resource bundle with the base name “Captions.properties” and the locale “en_US”. However, there is no such resource bundle available in the classpath. The available resource bundles are:Captions.propertiesCaptions_en.propertiesCaptions_US.propertiesCaptions_en_US.propertiesThe ResourceBundle class follows a fallback mechanism to find the best matching resource bundle for a given locale. It first tries to find the resource bundle with the exact locale, then it tries to find the resource bundle with the same language and script, then it tries to find the resource bundle with the same language, and finally it tries to find the default resource bundle with no locale. If none of these resource bundles are found, it throws a MissingResourceException.In this case, the code fragment is looking for a resource bundle with the base name “Captions.properties” and the locale “en_US”. The ResourceBundle class will try to find the following resource bundles in order:Captions.properties_en_USCaptions.properties_enCaptions.propertiesHowever, none of these resource bundles exist in the classpath. Therefore, the ResourceBundle class will throw a MissingResourceException.To fix this error, the code fragment should use the correct base name of the resource bundle family, which is“Captions” without the “.properties” extension. For example:ResourceBundle captions = ResourceBundle.getBundle(“Captions”, currentLocale); This will load the appropriate resource bundle for the current locale, which is “Captions_en_US.properties” in this case. References:Oracle Certified Professional: Java SE 17 DeveloperJava SE 17 DeveloperOCP Oracle Certified Professional Java SE 17 Developer Study GuideResourceBundle (Java Platform SE 8 )About the ResourceBundle Class (The Java™ Tutorials > Internationalization)NEW QUESTION 32Given the code fragment:Which code line n1, obtains the java.io.Console object?           The code fragment is trying to obtain the java.io.Console object, which is a class that provides methods to access the character-based console device, if any, associated with the current Java virtual machine. The correct way to obtain the Console object is to call the static method Console console() in the java.lang.System class. This method returns the unique Console object associated with the current Java virtual machine, if any. Therefore, option A is correct, as it calls System.console() and assigns it to a Console variable. Reference:https://docs.oracle.com/javase/17/docs/api/java.base/java/io/Console.htmlhttps://docs.oracle.com/javase/17/docs/api/java.base/java/lang/System.html#console()https://education.oracle.com/products/trackp_OCPJSE17https://mylearn.oracle.com/ou/learning-path/java-se-17-developer/99487NEW QUESTION 33Given:Which two should the module-info file include for it to represent the service provider interface?  Requires cm.transport.vehicle,cars:  Provides.com.transport.vehicle.cars.Car with com.transport.vehicle.cars. impt, CatImpI;  Requires cm.transport.vehicle,cars:  Provides.com.transport.vehicle.cars.Car impl,CarImp1 to com.transport.vehicle.cars. Cars  exports com.transport.vehicle.cars.Car;  Exports com.transport.vehicle.cars;  Exports com.transport.vehicle; ExplanationThe answer is B and E because the module-info file should include a provides directive and an exports directive to represent the service provider interface. The provides directive declares that the module provides an implementation of a service interface, which is com.transport.vehicle.cars.Car in this case. The with clause specifies the fully qualified name of the service provider class, which is com.transport.vehicle.cars.impl.CarImpl in this case. The exports directive declares that the module exports a package, which is com.transport.vehicle.cars in this case, to make it available to other modules. The package contains the service interface that other modules can use.Option A is incorrect because requires is not the correct keyword to declare a service provider interface.Requires declares that the module depends on another module, which is not the case here.Option C is incorrect because it has a typo in the module name. It should be com.transport.vehicle.cars, not cm.transport.vehicle.cars.Option D is incorrect because it has a typo in the keyword provides. It should be provides, not Provides. It also has a typo in the service interface name. It should be com.transport.vehicle.cars.Car, not com.transport.vehicle.cars.Car impl. It also has an unnecessary to clause, which is used to limit the accessibility of an exported package to specific modules.Option F is incorrect because it exports the wrong package. It should export com.transport.vehicle.cars, not com.transport.vehicle.cars.impl. The impl package contains the service provider class, which should not be exposed to other modules.Option G is incorrect because it exports the wrong package. It should export com.transport.vehicle.cars, not com.transport.vehicle. The vehicle package does not contain the service interface or the service provider class.References:Oracle Certified Professional: Java SE 17 DeveloperJava SE 17 DeveloperOCP Oracle Certified Professional Java SE 17 Developer Study GuideJava Modules – Service Interface Module – GeeksforGeeksJava Service Provider Interface | BaeldungNEW QUESTION 34Given:Which statement is true?  The program throws StockException.  The program fails to compile.  The program throws outofStockException.  The program throws ClassCastException The answer is B because the code fragment contains a syntax error that prevents it from compiling. The code fragment tries to catch a StockException in line 10, but the catch block does not have a parameter of type StockException. The catch block should have a parameter of type StockException, such as:catch (StockException e) { // handle the exception }This is required by the Java syntax for the catch clause, which must have a parameter that is a subclass of Throwable. Without a parameter, the catch block is invalid and causes a compilation error.Option A is incorrect because the program does not throw a StockException, as it does not compile.Option C is incorrect because the program does not throw an OutofStockException, as it does not compile.Option D is incorrect because the program does not throw a ClassCastException, as it does not compile. Reference:Oracle Certified Professional: Java SE 17 DeveloperJava SE 17 DeveloperOCP Oracle Certified Professional Java SE 17 Developer Study GuideThe try-with-resources Statement (The Java™ Tutorials > Essential Classes > Exceptions) The catch Blocks (The Java™ Tutorials > Essential Classes > Exceptions)NEW QUESTION 35Given the code fragment:What is the result?  81111  8109  777  71010  888  7107 The code fragment is creating a string variable “a” with the value “Hello! Java”. Then, it is printing the index of “Java” in “a”. Next, it is replacing “Hello!” with “Welcome!” in “a”. Then, it is printing the index of “Java” in “a”. Finally, it is creating a new StringBuilder object “b” with the value of “a” and printing the index of “Java” in “b”. The output will be 8109 because the index of “Java” in “a” is 8, the index of “Java” in “a” after replacing “Hello!” with “Welcome!” is 10, and the index of “Java” in “b” is 9. Reference: Oracle Java SE 17 Developer source and documents: [String (Java SE 17 & JDK 17)], [StringBuilder (Java SE 17 & JDK 17)]NEW QUESTION 36Given:What is the result?  4  2  6  Nothing is printed because of an indefinite loop.  Compilation fails.  5  A runtime exception is thrown.  3 The code will not compile because the variable ‘x’ is declared as final and then it is being modified in the switch statement. This is not allowed in Java. A final variable is a variable whose value cannot be changed once it is initialized1. The switch statement tries to assign different values to ‘x’ depending on the value of ‘y’, which violates the final modifier. The compiler will report an error: The final local variable x cannot be assigned. It must be blank and not using a compound assignment. Reference: The final Keyword (The Java™ Tutorials > Learning the Java Language > Classes and Objects)NEW QUESTION 37Given:Which statement is true while the program prints GC?  Only the object referenced by t2 is eligible for garbage collection.  Both the objects previously referenced by t1 are eligible for garbage collection.  None of the objects are eligible for garbage collection.  Only one of the objects previously referenced by t1 is eligible for garbage collection. NEW QUESTION 38Assume you have an automatic module from the module path display-ascii-0.2. jar. Which name is given to the automatic module based on the given JAR file?  Display.ascii  Display-ascii-0.2  Display-ascii  Display-ascii-0 ExplanationAn automatic module name is derived from the name of the JAR file when it does not contain a module-info.class file. If the JAR file has an “Automatic-Module-Name” attribute in its main manifest, then its value is the module name. Otherwise, the module name is derived from the JAR file’s name by removing any version numbers and converting it to lower case. Therefore, for a JAR named display-ascii-0.2.jar, the automatic module name would be display-ascii, following these rules.NEW QUESTION 39Which statement is true?  The tryLock () method returns a boolean indicator immediately regardless if it has or has not managed to acquire the lock.  The tryLock () method returns a boolean indicator immediately if it has managed to acquire the lock, otherwise it waits for the lock acquisition.  The lock () method returns a boolean indicator immediately if it has managed to acquire the lock, otherwise it waits for the lock acquisition.  The Lock () method returns a boolean indicator immediately regardless if it has or has not managed to acquire the lock The tryLock () method of the Lock interface is a non-blocking attempt to acquire a lock. It returns true if the lock is available and acquired by the current thread, and false otherwise. It does not wait for the lock to be released by another thread. This is different from the lock () method, which blocks the current thread until the lock is acquired, and does not return any value. Reference: https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/locks/Lock.html#tryLock(), 3, 4, 5NEW QUESTION 40Given the code fragments:Which is true?  The program prints t1 : 1: t2 : 1: t1 : t2 : 2 : in random order.  The program prints t1 : 1 : t2: 1 : t1 : 2 : t2: 2:  The program prints t1 : 1: t2 : 1: t1 : 1 : t2 : 1 : indefinitely  The program prints an exception The code creates two threads, t1 and t2, and starts them. The threads will print their names and the value of the Atomic Integer object, x, which is initially set to 1. The threads will then increment the value of x and print their names and the new value of x. Since the threads are started at the same time, the output will be in random order. However, the final output will always be t1 : 1 : t2: 1 : t1 : 2 : t2: 2: Reference: AtomicInteger (Java SE 17 & JDK 17) – OracleNEW QUESTION 41Which two code fragments compile?           ExplanationThe two code fragments that compile are B and E. These are the only ones that use the correct syntax for declaring and initializing a var variable. The var keyword is a reserved type name that allows the compiler to infer the type of the variable based on the initializer expression. However, the var variable must have an initializer, and the initializer must not be null or a lambda expression. Therefore, option A is invalid because it does not have an initializer, option C is invalid because it has a null initializer, and option D is invalid because it has a lambda expression as an initializer. Option B is valid because it has a String initializer, and option E is valid because it has an int initializer.https://docs.oracle.com/en/java/javase/17/language/local-variable-type-inference.htmlNEW QUESTION 42Given:What is the result?  flipsflips  Compilation fails  flipsruns  runsflips  runsruns ExplanationThe code fragment will fail to compile because the play method in the Dog class is declared as private, which means that it cannot be accessed from outside the class. The main method is trying to call the play method on a Dog object, which is not allowed. Therefore, the code fragment will produce a compilation error.NEW QUESTION 43Given the code fragment:What is the result?  Logged out at: 2021-0112T21:58:19.880z  Logged out at: 2021-01-12T21:58:00z  A compilation error occurs at Line n1.  Can’t logout ExplanationThe code fragment is using the Java SE 17 API to get the current time and then truncating it to minutes. The result will be the current time truncated to minutes, which is why option B is correct. References:https://education.oracle.com/products/trackp_OCPJSE17https://mylearn.oracle.com/ou/learning-path/java-se-17-developer/99487https://docs.oracle.com/javase/17/docs/api/java.base/java/time/Instant.html#truncatedTo(java.time.tempora Loading … Oracle 1Z0-829 certification exam is designed for Java developers who want to validate their knowledge and expertise in developing applications using Java SE 17. Java SE 17 Developer certification exam measures the candidate's understanding of advanced Java concepts such as concurrency, localization, IO, and NIO. Passing the Oracle 1Z0-829 exam demonstrates that the candidate has the skills and knowledge necessary to develop robust and efficient Java applications.   Dumps Brief Outline Of The 1Z0-829 Exam: https://www.validexam.com/1Z0-829-latest-dumps.html --------------------------------------------------- Images: https://premium.validexam.com/wp-content/plugins/watu/loading.gif https://premium.validexam.com/wp-content/plugins/watu/loading.gif --------------------------------------------------- --------------------------------------------------- Post date: 2024-03-15 14:29:52 Post date GMT: 2024-03-15 14:29:52 Post modified date: 2024-03-15 14:29:52 Post modified date GMT: 2024-03-15 14:29:52