Updated Mar-2026 Test Engine to Practice 1Z0-819 Dumps & Practice Exam
Dumps Collection 1Z0-819 Test Engine Dumps Training With 297 Questions
NEW QUESTION # 120
Given:
What is the result?
- A. b3
- B. b1
- C. 0
- D. The compilation fails due to an error in line 1.
- E. b2
- F. 1
- G. 2
Answer: C
Explanation:
NEW QUESTION # 121
Which two statements independently compile? (Choose two.)
- A. List<? super Float> list = new ArrayList<Double>();
- B. List<? extends Number> list = new ArrayList<Byte>();
- C. List<? extends Number> list = new ArrayList<Object>();
- D. List<? super Short> list = new ArrayList<Number>();
- E. List<? super Number> list = new ArrayList<Integer>();
Answer: B,D
Explanation:
NEW QUESTION # 122
Which code fragment added to line 1 enables the code to compile and print Hello Joe?
- A.
- B.
- C.
- D.
Answer: D
NEW QUESTION # 123
Why would you choose to use a peek operation instead of a forEach operation on a Stream?
- A. to process the current item and return void
- B. to remove an item from the end of the stream
- C. to process the current item and return a stream
- D. to remove an item from the beginning of the stream
Answer: C
NEW QUESTION # 124
Given the code fragment:
Path source = Paths.get("/repo/a/a.txt");
Path destination = Paths.get("/repo");
Files.move(source, destination); // line 1
Files.delete (source); // line 2
Assuming the source file and destination folder exist, what Is the result?
- A. A java.nio.file.NoSuchFileException is thrown on line 2.
- B. a.txt is renamed repo.
- C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
- D. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
Answer: C
NEW QUESTION # 125
Given:
Which is true?
- A. The compilation fails due to an error in line 7.
- B. The compilation fails due to an error in line 4.
- C. The compilation fails due to an error in line 10.
- D. The compilation fails due to an error in line 6.
- E. The compilation succeeds.
- F. The compilation fails due to an error in line 9.
- G. The compilation fails due to an error in line 2.
Answer: D
NEW QUESTION # 126
Given:
Which is true about line 1?
- A. If the value is not present, nothing is done.
- B. If the value is not present, a NoSuchElementException is thrown at run time.
- C. If the value is not present, a NullPointerException is thrown at run time.
- D. It always executes the System.out::print statement.
Answer: A
Explanation:
NEW QUESTION # 127
Given:
What is required to make the Foo class thread safe?
- A. No change is required.
- B. Replace the lock constructor call with new ReentrantLock (true).
- C. Make the declaration of lock static.
- D. Move the declaration of lock inside the foo method.
Answer: B
NEW QUESTION # 128
Given:
What is the result?
- A. 1.99,2.99,0.0
- B. 1.99,2.99
- C. 1.99,2.99,0
- D. The compilation fails.
Answer: D
Explanation:
NEW QUESTION # 129
Given:
executed using command:
java Hello "Hello World" Hello World
What is the output?
- A. Hello World Hello World
- B. Hello WorldHello World
- C. Hello WorldHelloWorld
- D. An exception is thrown at runtime.
- E. HelloHello WorldHelloWorld
Answer: A
NEW QUESTION # 130
Given:
A) An exception is thrown at run time.
B)
C) The compilation fails due to an error on line 2.
D) The compilation fails due to an error on line 1.
E)
F)
The compilation fails due to an error on line 3.
- A. Option D
- B. Option C
- C. Option A
- D. Option E
- E. Option F
- F. Option B
Answer: C
NEW QUESTION # 131
Given:
Which two method implementations are correct, when inserted independently in line 1? (Choose two.)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
- E. Option E
Answer: C,E
NEW QUESTION # 132
Given this enum declaration:
Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?
- A. final String getFirstLetter() { return A.toString(); }
- B. String getFirstLetter() { return A.toString(); }
- C. static String getFirstLetter() { return Alphabet.values()[1].toString(); }
- D. static String getFirstLetter() { return A.toString(); }
Answer: D
NEW QUESTION # 133
Given the code fragment:
You must make the countvariable thread safe.
Which two modifications meet your requirement? (Choose two.)
- A. replace line 3 with
synchronized(test.count) {
test.count++;
} - B. replace line 1 with private volatile int count = 0;
- C. replace line 2 with public static synchronized void main(String[] args) {
- D. replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
- E. replace line 3 with
synchronized(test) {
test.count++;
}
Answer: A,D
Explanation:
Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164
NEW QUESTION # 134
Given the code fragment:
Which statement at line 1 will print Ping Pong?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION # 135
Which method throws an exception for not-a-number and infinite input values?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: C
NEW QUESTION # 136
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