Share Latest Apr-2024 1z1-829 DUMP with 50 Questions and Answers
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The 1Z0-829 exam covers a wide range of topics related to Java SE 17, including advanced data manipulation, concurrency, and exception handling. It also covers topics related to the new features introduced in Java SE 17, such as pattern matching for instanceof, sealed classes, and records. 1z1-829 exam consists of 80 multiple-choice questions and has a time limit of 150 minutes.
Oracle 1Z0-829 exam is a certification test for developers who work with Java SE 17. 1z1-829 exam is designed to test the candidate's knowledge and skills related to Java programming language, software development practices, and application development. Passing 1z1-829 exam is a way for developers to demonstrate their proficiency with the latest version of Java and increase their marketability in the industry.
NEW QUESTION # 14
Given the code fragment:
What is the result:
- A. ABCDE // the order of elements is unpredictable
- B. ABCE
- C. ABBCDE // the order of elements is unpredictable
- D. ADEABCB // the order of element is unpredictable
Answer: C
Explanation:
The answer is D because the code fragment uses the Stream API to create two streams, s1 and s2, and then concatenates them using the concat() method. The resulting stream is then processed in parallel using the parallel() method, and the distinct() method is used to remove duplicate elements. Finally, the forEach() method is used to print the elements of the resulting stream to the console. Since the order of elements in a parallel stream is unpredictable, the output could be any of the options given, but option D is the most likely. Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Parallelizing Streams
NEW QUESTION # 15
Which statement is true?
- A. thread in waiting state consumes CPU cycles.
- B. A thread in waiting state must handle InterrupedException.
- C. After the timed wait expires, the waited thread moves to the terminated state.
- D. IllegalStateException is thrown if a thread in waiting state is moved back to runnable.
Answer: B
Explanation:
A thread in waiting state is waiting for another thread to perform a particular action, such as calling notify() or notifyAll() on a shared object, or terminating a joined thread. A thread in waiting state can be interrupted by another thread, which will cause the waiting thread to throw an InterruptedException and return to the runnable state. Therefore, a thread in waiting state must handle InterruptedException, either by catching it or declaring it in the throws clause. Reference: Thread.State (Java SE 17 & JDK 17), [Thread (Java SE 17 & JDK 17)]
NEW QUESTION # 16
Given the product class:
And the shop class:
What is the result?
- A. Compilation fails
- B. Cookie 3.99 2.99
- C. Cookie 0.0 0.0
- D. Cookie 2.99 2.99
- E. Cookie 0.0 2.99
- F. An exception is produced at runtime
Answer: A
Explanation:
Explanation
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. References: Object Serialization - Oracle, [ObjectInputStream (Java SE 17 & JDK 17) - Oracle]
NEW QUESTION # 17
Given:
What is the result?
- A. Compilation fails
- B. A RuntimeException is thrown
- C. Tablechair Tablechair
- D. wTableChair TableChair
- E. Wtablechair tableChair
Answer: A
Explanation:
Explanation
The code fragment will fail to compile because the class name and the constructor name do not match. The class name is Furniture, but the constructor name is Wtable. This will cause a syntax error. The correct way to define a constructor is to use the same name as the class name. Therefore, the code fragment should change the constructor name to Furniture or change the class name to Wtable.
NEW QUESTION # 18
Given:
Which two should the module-info file include for it to represent the service provider interface?
- A. Exports com.transport.vehicle.cars;
- B. Provides.com.transport.vehicle.cars.Car with com.transport.vehicle.cars. impt, CatImpI;
- C. exports com.transport.vehicle.cars.Car;
- D. Provides.com.transport.vehicle.cars.Car impl,CarImp1 to com.transport.vehicle.cars. Cars
- E. Requires cm.transport.vehicle,cars:
- F. Requires cm.transport.vehicle,cars:
- G. Exports com.transport.vehicle;
Answer: B,C
Explanation:
The 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. Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Java Modules - Service Interface Module - GeeksforGeeks
Java Service Provider Interface | Baeldung
NEW QUESTION # 19
Given:
What is the result?
- A. UserName
- B. User name (EN - US)
- C. User name (EN)
- D. User name (US)
- E. The program throws a MissingResourceException.
Answer: E
Explanation:
Explanation
The 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.properties
Captions_en.properties
Captions_US.properties
Captions_en_US.properties
The 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_US
Captions.properties_en
Captions.properties
However, 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 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
ResourceBundle (Java Platform SE 8 )
About the ResourceBundle Class (The Java™ Tutorials > Internationalization)
NEW QUESTION # 20
Which two code fragments compile?
- A.
- B.
- C.
- D.
- E.
Answer: B,D
Explanation:
Explanation
The 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.html
NEW QUESTION # 21
Given:
Which two method invocation execute?
- A. IFace.m2();
- B. IFace myclassobj = new Myc (); myclassObj.m3 ();
- C. Ifnce.m3 ();
- D. new MyC() .m2 ();
- E. IFace .,4():
- F. iFace mucloassObj = new Myc (); myClassObj.m4();
Answer: D,E
Explanation:
Explanation
The code given is an interface and a class that implements the interface. The interface has three methods, m1(), m2(), and m3(). The class has one method, m1(). The only two method invocations that will execute are D and E.
D is a call to the m2() method in the class, and E is a call to the m3() method in the interface. References:
https://education.oracle.com/products/trackp_OCPJSE17, 3, 4, 5
NEW QUESTION # 22
Given the code fragment:
- A. True:false:false:false
- B. True:false:true:true
- C. True:false:true:false
- D. True:true:false:false
Answer: A
Explanation:
The code fragment compares four pairs of strings using the equals() and intern() methods. The equals() method compares the content of two strings, while the intern() method returns a canonical representation of a string, which means that it returns a reference to an existing string with the same content in the string pool. The string pool is a memory area where strings are stored and reused to save space and improve performance. The results of the comparisons are as follows:
s1.equals(s2): This returns true because both s1 and s2 have the same content, "Hello Java 17".
s1 == s2: This returns false because s1 and s2 are different objects with different references, even though they have the same content. The == operator compares the references of two objects, not their content.
s1.intern() == s2.intern(): This returns true because both s1.intern() and s2.intern() return a reference to the same string object in the string pool, which has the content "Hello Java 17". The intern() method ensures that there is only one copy of each distinct string value in the string pool.
"Hello Java 17" == s2: This returns false because "Hello Java 17" is a string literal, which is automatically interned and stored in the string pool, while s2 is a string object created with the new operator, which is not interned by default and stored in the heap. Therefore, they have different references and are not equal using the == operator.
NEW QUESTION # 23
Given:
Which two method invocation execute?
- A. IFace.m2();
- B. Ifnce.m3 ();
- C. IFace myclassobj = new Myc ();
myclassObj.m3 (); - D. new MyC() .m2 ();
- E. IFace .,4():
- F. iFace mucloassObj = new Myc ();
myClassObj.m4();
Answer: D,E
Explanation:
The code given is an interface and a class that implements the interface. The interface has three methods, m1(), m2(), and m3(). The class has one method, m1(). The only two method invocations that will execute are D and E. D is a call to the m2() method in the class, and E is a call to the m3() method in the interface. Reference: https://education.oracle.com/products/trackp_OCPJSE17, 3, 4, 5
NEW QUESTION # 24
Given the code fragment:
Which two statements at Line nl independently enable you to print 1250?
- A. Integer res = 250 + s:
- B. Integer res= 250 + s2;
- C. Integer res = 250 + integer . valueof (s);
- D. Integer res = 250 + integer (s2):
- E. Integer res = 250 + integer.parseint (s)
- F. Integer res = 250; Res = + s2;
Answer: C,E
Explanation:
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: References: 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 # 25
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
- F. 5
Answer: A
Explanation:
Explanation
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. References: Oracle Java SE 17 Developer source and documents: [String (Java SE 17 & JDK 17)], [StringBuilder (Java SE 17 & JDK 17)]
NEW QUESTION # 26
Given the code fragment:
abstract sealed interface SInt permits Story, Art { default String getTitle() { return "Book Title" ; }
}
Which set of class definitions compiles?
- A. Interace story extends STnt {}
Interface Art extends SInt {} - B. Public interface story extends sInd {}
Public interface Art extends SInt {} - C. Non-sealed interface story extends SInt {}
Class Art implements Sint {} - D. Non-sealed interface story extends SInt {}
Non-sealed interaface Art extends Sint {} - E. Sealed interface Storty extends sInt {}
Non-sealed class Art implements Sint {}
Answer: E
Explanation:
The answer is C because the code fragment given is an abstract sealed interface SInt that permits Story and Art. The correct answer is option C, which is a sealed interface Story that extends SInt and a non-sealed class Art that implements SInt. This is because a sealed interface can only be extended by the classes or interfaces that it permits, and a non-sealed class can implement a sealed interface.
Option A is incorrect because interface is misspelled as interace, and Story and Art should be capitalized as they are the names of the permitted classes or interfaces.
Option B is incorrect because public is misspelled as public, and sInd should be SInt as it is the name of the sealed interface.
Option D is incorrect because a non-sealed interface cannot extend a sealed interface, as it would violate the restriction of permitted subtypes.
Option E is incorrect because both Story and Art cannot be non-sealed interfaces, as they would also violate the restriction of permitted subtypes.
Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Sealed Classes and Interfaces in Java 15 | Baeldung
Sealed Class in Java - Javatpoint
NEW QUESTION # 27
Given:
What is the result?
- A. 0
- B. 1
- C. A runtime exception is thrown.
- D. 2
- E. 3
- F. 4
- G. Compilation fails.
- H. Nothing is printed because of an indefinite loop.
Answer: G
Explanation:
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 # 28
Given the code fragment:
What is the result?
- A. 5000$60M6D
- B. $SIM6D
- C. PT5SPTIMP6D
- D. PT5000PT60MP6D
Answer: D
Explanation:
The code fragment is creating a Duration object with a value of 5000 milliseconds, then printing it. Then, it is creating another Duration object with a value of 60 seconds, then printing it. Finally, it is creating a Period object with a value of 6 days, then printing it. The output will be "PT5000PT60MP6D". Reference: https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html, https://docs.oracle.com/javase/8/docs/api/java/time/Period.html
NEW QUESTION # 29
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Oracle 1Z0-829 exam is a certification for Java developers who want to showcase their expertise in Java SE 17. 1z1-829 exam is designed to test the candidate's proficiency in working with Java SE 17 APIs, Java class design, and Java I/O fundamentals. Java SE 17 Developer certification is a valuable asset for Java developers who want to advance their career and demonstrate their skills to potential employers.
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