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Oracle Java SE 17 Developer Sample Questions (Q45-Q50):

NEW QUESTION # 45
Given the code fragment:

What is the result?

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

Answer: D

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 # 46
Given the directory structure:

Given the definition of the Doc class:

Which two are valid definition of the wordDoc class?

A. Package p1;
Public final class WordDoc extends Doc ()
B. Package p1, p2;
Public sealed class WordDoc extends Doc ()
C. Package p1, p2;
Public non-sealed class WordDoc extends Doc ()
D. Package p1,
non-sealed abstract class WordDoc extends Doc ()
E. Package p1;
Public class wordDoc extends Doc ()
F. Package p1;
Public non-sealed class wordDoc extends Doc ()

Answer: A,F

Explanation:
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

NEW QUESTION # 47
Which statement is true?

A. The tryLock () method returns a boolean indicator immediately if it has managed to acquire the lock, otherwise it waits for the lock acquisition.
B. The tryLock () method returns a boolean indicator immediately regardless if it has or has not managed to acquire the lock.
C. The Lock () method returns a boolean indicator immediately regardless if it has or has not managed to acquire the lock
D. The lock () method returns a boolean indicator immediately if it has managed to acquire the lock, otherwise it waits for the lock acquisition.

Answer: B

Explanation:
Explanation
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. References:
https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/locks/Lock.html#tryLock(), 3, 4

NEW QUESTION # 48
Given the code fragment:

What is the result?

A. 1
2
-4
B. 1
1
1
C. 0
B 2
C -2
D. 2
2
0

Answer: D

Explanation:
The code fragment uses the Collections.binarySearch method to search for the string "e3" in the list. The first search returns the index of the element, which is 2. The second search returns the index of the element, which is 0. The third search returns the index of the element, which is -4. The final result is 2. Reference: Collections (Java SE 17 & JDK 17) - Oracle

NEW QUESTION # 49
Given:

Which two modifications enable the code to print Open Close?

Answer: B,D

Explanation:
Explanation
The code given is a try-with-resources statement that declares a resource of type AutoCloseable. The resource is an anonymous class that implements the AutoCloseable interface and overrides the close() method. The code also has a print() method that prints the value of the variable s. The code is supposed to print "Open Close", but it does not compile because of two errors.
The first error is at line n1, where the anonymous class is missing a semicolon at the end of its declaration.
This causes a syntax error and prevents the code from compiling. To fix this error, option B adds a semicolon after the closing curly brace of the anonymous class.
The second error is at line n2, where the print() method is called without an object reference. This causes a compilation error because the print() method is not static and cannot be invoked without an object. To fix this error, option E adds an object reference to the print() method by using the variable t.
Therefore, options B and E are correct and enable the code to print "Open Close".

NEW QUESTION # 50
......

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ORACLE - PROFESSIONAL UPDATED 1Z0-829 TESTKINGS

Oracle - Professional Updated 1Z0-829 Testkings