Oracle 1Z0-829 Exam Dumps

The correct answer is A and F because the wordDoc class must be a non-sealed class or a final class to extend the sealed Doc class. Option B is incorrect because the wordDoc class must be non-sealed or final. Option C is incorrect because the wordDoc class cannot be in a different package than the Doc class. Option D is incorrect because the wordDoc class cannot be a sealed class. Option E is incorrect because the wordDoc class cannot be an abstract class.Reference:Oracle Certified Professional: Java SE 17 Developer,3 Sealed Classes - Oracle Help Center

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) - Oracle

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)

The code fragment is trying to read an object from a file using the ObjectInputStream class. This class throws an IOException and a ClassNotFoundException. To handle these exceptions, the main method signature should declare that it throws these exceptions. Otherwise, the code will not compile. If the main method throws these exceptions, the code will print Wagon : 200, which is the result of calling the toString method of the LuxuryCar object that was written to the file.Reference:ObjectInputStream (Java SE 17 & JDK 17) - Oracle,ObjectOutputStream (Java SE 17 & JDK 17) - Oracle

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