100% Pass 2025 Oracle 1Z0-829 Useful Valid Test Topics

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Oracle 1Z0-829 exam consists of 80 multiple-choice questions and has a time limit of 150 minutes. 1Z0-829 exam covers topics such as Java classes and interfaces, functional programming, database access, and security. Candidates who pass the exam will receive the Oracle Certified Professional: Java SE 17 Developer certification, which is recognized worldwide as a standard of excellence in the field of Java application development. Java SE 17 Developer certification can enhance the career opportunities of Java developers and increase their earning potential.

The Oracle 1Z0-829 Exam consists of 80 multiple-choice questions that must be answered within 150 minutes. The questions are designed to test the candidate's knowledge of advanced Java programming concepts, including modules, concurrency, and I/O. 1Z0-829 exam also covers topics related to software development practices such as testing, debugging, and troubleshooting.

Oracle Java SE 17 Developer Sample Questions (Q14-Q19):

NEW QUESTION # 14
Given:

What is the result?

A. Software Game read error
B. Software game write error
C. Software Game Chess 0
D. Software Game Software Game chess 0
E. Software Game Software Game Chese 2
F. Software Game Chess 2

Answer: E

Explanation:
The answer is B because the code uses the writeObject and readObject methods of the ObjectOutputStream and ObjectInputStream classes to serialize and deserialize the Game object. These methods use the default serialization mechanism, which writes and reads the state of the object's fields, including the inherited ones. Therefore, the title field of the Software class is also serialized and deserialized along with the players field of the Game class. The toString method of the Game class calls the toString method of the Software class using super.toString(), which returns the value of the title field. Hence, when the deserialized object is printed, it shows "Software Game Software Game Chess 2". Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Serialization and Deserialization in Java with Example

NEW QUESTION # 15
Given the code fragment:

What is the result?

A. A NullPointerException is thrown
Cat
Cat
B. Cat
Dog
C. Cat
null
D. Dog
Dog

Answer: C

Explanation:
The answer is E because the code fragment creates a new Pet object with the name "Dog" and assigns it to the variable p. Then, it assigns p to p1. Next, it changes the name of p1 to "Cat". Then, it assigns p1 to p. Finally, it sets p to null and prints the name of p and p1. The output will be "Cat" and "null" because p is set to null and p1 still points to the Pet object with the name "Cat".

NEW QUESTION # 16
Given:

and the code fragment:

A. 300.00
CellPhone,ToyCar,Motor,Fan
B. 100.00 CellPhone,ToyCar
C. 300.00 CellPhone.ToyCar
D. 100.00
CellPhone,ToyCar,Motor,Fan

Answer: A

Explanation:
Explanation
The code fragment is using the Stream API to perform a reduction operation on a list of ElectricProduct objects. The reduction operation consists of three parts: an identity value, an accumulator function, and a combiner function. The identity value is the initial value of the result, which is 0.0 in this case. The accumulator function is a BiFunction that takes two arguments: the current result and the current element of the stream, and returns a new result. In this case, the accumulator function is (a,b) -> a + b.getPrice (), which means that it adds the price of each element to the current result. The combiner function is a BinaryOperator that takes two partial results and combines them into one. In this case, the combiner function is (a,b) -> a + b, which means that it adds the two partial results together.
The code fragment then applies a filter operation on the stream, which returns a new stream that contains only the elements that match the given predicate. The predicate is p -> p.getPrice () > 10, which means that it selects only the elements that have a price greater than 10. The code fragment then applies a map operation on the filtered stream, which returns a new stream that contains the results of applying the given function to each element. The function is p -> p.getName (), which means that it returns the name of each element.
The code fragment then calls the collect method on the mapped stream, which performs a mutable reduction operation on the elements of the stream using a Collector. The Collector is Collectors.joining (","), which means that it concatenates the elements of the stream into a single String, separated by commas.
The code fragment then prints out the result of the reduction operation and the result of the collect operation, separated by a new line. The result of the reduction operation is 300.00, which is the sum of the prices of all ElectricProduct objects that have a price greater than 10. The result of the collect operation is CellPhone,ToyCar,Motor,Fan, which is the concatenation of the names of all ElectricProduct objects that have a price greater than 10.
Therefore, the output of the code fragment is:
300.00 CellPhone,ToyCar,Motor,Fan
References: Stream (Java SE 17 & JDK 17) - Oracle, Collectors (Java SE 17 & JDK 17) - Oracle

NEW QUESTION # 17
Given:

What is the result?

A. flipsruns
B. runsruns
C. flipsflips
D. Compilation fails
E. runsflips

Answer: D

Explanation:
The 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 # 18
Given:

What is the result?

A. UserName
B. The program throws a MissingResourceException.
C. User name (EN)
D. User name (EN - US)
E. User name (US)

Answer: B

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. Reference:
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 # 19
......

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100% Pass 2025 Oracle 1Z0-829 Useful Valid Test Topics

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Oracle Java SE 17 Developer Sample Questions (Q14-Q19):

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