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1z1-809 Guide - Pass Guaranteed Quiz 2025 1z1-809: First-grade Official Java SE 8 Programmer II Practice Test
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If you are an experienced Java developer looking to take your career to the next level, the Oracle 1z1-809 Certification Exam is an excellent choice. It is a globally recognized certification that demonstrates your expertise in Java SE 8 and is highly valued by employers.
Preparing for the Oracle 1z1-809 exam requires a thorough understanding of Java SE 8 programming concepts and a good grasp of programming principles. Candidates can prepare for the exam by taking courses, reading books, and practicing with sample questions and mock exams. Additionally, candidates can use Oracle's official study materials, including the Java SE 8 Programmer II Study Guide and the Java SE 8 Programmer II Exam Practice Tests, which provide comprehensive coverage of the exam objectives and practice questions to help candidates prepare for the exam.
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The Java SE 8 Programmer II certification exam is a multiple-choice exam that tests the candidate's knowledge of Java programming, including Java Class Design, Advanced Java Class Design, Generics and Collections, Lambda Built-in Functional Interfaces, Java Stream API, Exceptions and Assertions, Java I/O Fundamentals, and Java Concurrency. 1z1-809 Exam consists of 80 multiple-choice questions that must be completed within 150 minutes.
Oracle Java SE 8 Programmer II Sample Questions (Q101-Q106):
NEW QUESTION # 101
Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?
- A. 20.0
30.0 - B. 0
- C. A compilation error occurs.
- D. A NumberFormatExceptionis thrown at run time.
Answer: A
NEW QUESTION # 102
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, "A");
books.put (1002, "C");
books.put (1001, "B");
books.put (1003, "B");
System.out.println (books);
What is the result?
- A. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- B. {1002 = C, 1003 = B, 1007 = A}
- C. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
- D. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
Answer: D
Explanation:
References:
NEW QUESTION # 103
Given:
Your design requires that:
* fuelLevel of Engine must be greater than zero when the start()method is invoked.
* The code must terminate if fuelLevelof Engineis less than or equal to zero.
Which code fragment should be added at line n1to express this invariant condition?
- A. assert fuelLevel > 0: "Impossible fuel" ;
- B. assert (fuelLevel) : "Terminating...";
- C. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- D. assert fuelLevel < 0: System.exit(0);
Answer: D
NEW QUESTION # 104
Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1 to start r1 and c1 threads?
- A. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>)
es.execute(c1); - B. es.execute (r1);Future<String> f1 = es.execute (c1) ;
- C. es.submit(r1);Future<String> f1 = es.submit (c1);
- D. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
Answer: C
NEW QUESTION # 105
Given the code fragment:
Which should be inserted into line n1to print Average = 2.5?
- A. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
- B. IntStream str = IntStream.of (1, 2, 3, 4);
- C. IntStream str = Stream.of (1, 2, 3, 4);
- D. Stream str = Stream.of (1, 2, 3, 4);
Answer: A
NEW QUESTION # 106
......
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