Avant-garde 1Z0-819 Exams For Java SE 11 Developer Certification

NEW QUESTION 1
Given:

What is the result?

• A. JoeMarry
• B. Joenull
• C. nullnull
• D. nullMary

Answer: D

Explanation:

NEW QUESTION 2
Given:

Which statement is equivalent to line 1?

• A. double totalSalary = list.stream().map(e > e.getSalary() * ratio).reduce (bo).ifPresent (p > p.doubleValue());
• B. double totalSalary = list.stream().mapToDouble(e > e.getSalary() * ratio).sum;
• C. double totalSalary = list.stream().map(Employee::getSalary * ratio).reduce (bo).orElse(0.0);
• D. double totalSalary = list.stream().mapToDouble(e > e.getSalary() * ratio).reduce(starts, bo);

Answer: C

Explanation:

NEW QUESTION 3
Given:

Which statement on line 1 enables this code fragment to compile?

• A. Function function = String::toUpperCase;
• B. UnaryOperator function = s > s.toUpperCase();
• C. UnaryOperator<String> function = String::toUpperCase;
• D. Function<String> function = m > m.toUpperCase();

Answer: C

Explanation:

NEW QUESTION 4
Given:
List<String> list1 = new ArrayList<>(); list1.add(“A”);
list1.add(“B”);
List list2 = List.copyOf(list1); list2.add(“C”);
List<List<String>> list3 = List.of(list1, list2); System.out.println(list3);
What is the result?

• A. [[A, B],[A, B]]
• B. An exception is thrown at run tim
• C. [[A, B], [A, B, C]]
• D. [[A, B, C], [A, B, C]]

Answer: B

Explanation:

NEW QUESTION 5
Given:

What is the output?

• A. 300
• B. Exception
• C. 200
• D. 100

Answer: A

Explanation:

NEW QUESTION 6
Which code fragment does a service use to load the service provider with a Print interface?

• A. private Print print = com.service.Provider.getInstance();
• B. private java.util.ServiceLoader<Print> loader = ServiceLoader.load (Print.class);
• C. private java.util.ServiceLoader<Print> loader = new java.util.ServiceLoader<> ();
• D. private Print print = new com.service.Provider.PrintImpl();

Answer: B

NEW QUESTION 7
Given the code fragment:

What is the result?

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

Answer: D

Explanation:

NEW QUESTION 8
Given the declaration:

Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

• A. @Resource(priority=100)
• B. @Resource(priority=0)
• C. @Resource(name=“Customer1”, priority=100)
• D. @Resource(name=“Customer1”)
• E. @Resource

Answer: AB

NEW QUESTION 9
Which interface in the java.util.function package can return a primitive type?

• A. ToDoubleFunction
• B. Supplier
• C. BiFunction
• D. LongConsumer

Answer: A

NEW QUESTION 10
Given:

What is the result?

• A. 2134
• B. 2143
• C. 214
• D. 234

Answer: C

Explanation:

NEW QUESTION 11
Given:

Which three are true? (Choose three.)

• A. b1.foo(c) prints Bonjour le monde!
• B. f1.foo(c) prints Hello world!
• C. f1.foo(c) prints Olá Mundo!
• D. b1.foo(c) prints Hello world!
• E. f2.foo(c) prints Olá Mundo!
• F. b1.foo(c) prints Olá Mundo!
• G. f2.foo(c) prints Bonjour le monde!
• H. f2.foo(c) prints Hello world!
• I. f1.foo(c) prints Bonjour le monde!

Answer: BFG

NEW QUESTION 12
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. static String getFirstLetter() { return Alphabet.values()[1].toString(); }
• C. static String getFirstLetter() { return A.toString(); }
• D. String getFirstLetter() { return A.toString(); }

Answer: C

NEW QUESTION 13
Given:

Which statement is true about the Fox class?

• A. Fox class does not have to override inhabit method, so long as it does not try to call it.
• B. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
• C. Fox class must implement either Forest or Town interfaces, but not both.
• D. The inhabit method implementation from the first interface that Fox implements will take precedence.
• E. Fox class must provide implementation for the inhabit method.

Answer: B

NEW QUESTION 14
Given:

executed with this command: java Main one two three What is the result?

• A. 0). one
• B. 0). one1). two2). three
• C. The compilation fails.
• D. It creates an infinite loop printing:0). one1). two1). two...
• E. A java.lang.NullPointerException is thrown.

Answer: D

NEW QUESTION 15
Given:

Which three actions implement Java SE security guidelines? (Choose three.)

• A. Change line 7 to return names.clone();.
• B. Change line 4 to this.names = names.clone();.
• C. Change the getNames() method name to get$Names().
• D. Change line 6 to public synchronized String[] getNames() {.
• E. Change line 2 to private final String[] names;.
• F. Change line 3 to private Secret(String[] names) {.
• G. Change line 2 to protected volatile String[] names;.

Answer: EFG

NEW QUESTION 16
Given:

And the command: java Main Helloworld What is the result ?

• A. Input: Echo:
• B. Input: Helloworld Echo: Helloworld
• C. Input:Then block until any input comes from System.in.
• D. Input:Echo: Helloworld
• E. A NullPointerException is thrown at run time.

Answer: C

Explanation:

NEW QUESTION 17
Which two statements are true about the modular JDK? (Choose two.)

• A. The foundational APIs of the Java SE Platform are found in the java.base module.
• B. An application must be structured as modules in order to run on the modular JDK.
• C. It is possible but undesirable to configure modules’ exports from the command line.
• D. APIs are deprecated more aggressively because the JDK has been modularized.

Answer: AC

NEW QUESTION 18
Given:

What is the type of the local variable x?

• A. Character
• B. char
• C. String[ ]
• D. String

Answer: D

NEW QUESTION 19
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