FREE PDF MARVELOUS 1Z0-829 - NEW JAVA SE 17 DEVELOPER EXAM PREP

Free PDF Marvelous 1Z0-829 - New Java SE 17 Developer Exam Prep

Free PDF Marvelous 1Z0-829 - New Java SE 17 Developer Exam Prep

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Oracle 1Z0-829 exam is intended for experienced Java developers who have a thorough understanding of the language and its various features. Candidates for the exam should have at least two years of experience working with Java and should be familiar with the latest features and enhancements in the language, including those introduced in Java SE 17. 1Z0-829 Exam is also suitable for developers who are looking to upgrade their existing Java certifications or who want to demonstrate their expertise in the language to potential employers.

Oracle Java SE 17 Developer Sample Questions (Q44-Q49):

NEW QUESTION # 44
Given the code fragment:

  • A. True:false:false:false
  • B. True:false:true:true
  • C. True:true:false:false
  • D. True:false:true: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 # 45
Given the code fragments:

Which is true?

  • A. The program prints an exception
  • B. The program prints t1 : 1: t2 : 1: t1 : t2 : 2 : in random order.
  • C. The program prints t1 : 1: t2 : 1: t1 : 1 : t2 : 1 : indefinitely
  • D. The program prints t1 : 1 : t2: 1 : t1 : 2 : t2: 2:

Answer: D

Explanation:
Explanation
The code creates two threads, t1 and t2, and starts them. The threads will print their names and the value of the Atomic Integer object, x, which is initially set to 1. The threads will then increment the value of x and print their names and the new value of x. Since the threads are started at the same time, the output will be in random order. However, the final output will always be t1 : 1 : t2: 1 : t1 : 2 : t2: 2: References: AtomicInteger (Java SE
17 & JDK 17) - Oracle


NEW QUESTION # 46
Given the course table:

Given the code fragment:

  • A. 0
  • B. 1
  • C. true
  • D. false

Answer: C

Explanation:
Explanation
The code fragment will execute the update statement and set the course fee of the course with ID 1021 to
5000. The executeUpdate method returns an int value that indicates the number of rows affected by the SQL statement. In this case, only one row will be updated, so the result variable will be 1. The if statement will check if the result is greater than 0, which is true, and print "Updated successfully". Therefore, the output of the code fragment is true. References: https://education.oracle.com/products/trackp_OCPJSE17,
https://mylearn.oracle.com/ou/learning-path/java-se-17-developer/99487,
https://docs.oracle.com/en/java/javase/17/docs/api/java.sql/java/sql/Statement.html#executeUpdate(java.lang.Str


NEW QUESTION # 47
Assuming that the data, txt file exists and has the following content:
Text1
Text2
Text3
Given the code fragment:

What is the result?

  • A. text1-text2-text3
    text3
  • B. text1-text2-text3
    A java.lang.indexoutofBoundsException is thrown.
  • C. text1-text2-text3
    text1
    text2
    text3
  • D. text1-
    text2-
    text3-
    text3

Answer: A

Explanation:
The answer is D because the code fragment reads the file "data.txt" and collects all the lines in the file into a single string, separated by hyphens. Then, it prints the resulting string. Next, it attempts to read the fourth line in the file (index 3) and print it. However, since the file only has three lines, an IndexOutOfBoundsException is thrown. Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Read contents of a file using Files class in Java


NEW QUESTION # 48
Given:

Which statement is true?

  • A. The program throws StockException.
  • B. The program throws ClassCastException
  • C. The program throws outofStockException.
  • D. The program fails to compile.

Answer: D

Explanation:
The answer is B because the code fragment contains a syntax error that prevents it from compiling. The code fragment tries to catch a StockException in line 10, but the catch block does not have a parameter of type StockException. The catch block should have a parameter of type StockException, such as:
catch (StockException e) { // handle the exception }
This is required by the Java syntax for the catch clause, which must have a parameter that is a subclass of Throwable. Without a parameter, the catch block is invalid and causes a compilation error.
Option A is incorrect because the program does not throw a StockException, as it does not compile.
Option C is incorrect because the program does not throw an OutofStockException, as it does not compile.
Option D is incorrect because the program does not throw a ClassCastException, as it does not compile. Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
The try-with-resources Statement (The Java™ Tutorials > Essential Classes > Exceptions) The catch Blocks (The Java™ Tutorials > Essential Classes > Exceptions)


NEW QUESTION # 49
......

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