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Most Recent Oracle 1Z0-829 Exam Questions & Answers


Prepare for the Oracle Java SE 17 Developer exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

QA4Exam focus on the latest syllabus and exam objectives, our practice Q&A are designed to help you identify key topics and solidify your understanding. By focusing on the core curriculum, These Questions & Answers helps you cover all the essential topics, ensuring you're well-prepared for every section of the exam. Each question comes with a detailed explanation, offering valuable insights and helping you to learn from your mistakes. Whether you're looking to assess your progress or dive deeper into complex topics, our updated Q&A will provide the support you need to confidently approach the Oracle 1Z0-829 exam and achieve success.

The questions for 1Z0-829 were last updated on Nov 20, 2024.
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Question No. 1

Which statement is true about modules?

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Correct Answer: C

A module path is a sequence of directories that contain modules or JAR files. A named module is a module that has a name and a module descriptor (module-info.class) that declares its dependencies and exports. An automatic module is a module that does not have a module descriptor, but is derived from the name and contents of a JAR file. Both named and automatic modules can be placed on the module path, and they can be resolved by the Java runtime. An unnamed module is a special module that contains all the classes that are not in any other module, such as those on the class path. An unnamed module is not on the module path, but it can read all other modules.


Question No. 2

Given the product class:

And the shop class:

What is the result?

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Correct Answer: E

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]


Question No. 3

Given:

What is the result?

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Correct Answer: E

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)


Question No. 4

Which statement is true?

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Correct Answer: A

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(),3,4,5


Question No. 5

Given the code fragment:

Which two statements at Line nl independently enable you to print 1250?

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Correct Answer: A, E

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)


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