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Oracle 1z1-819 Exam Syllabus Topics:

Topic	Details
Topic 1	Implement serialization and deserialization techniques on Java objects Declare and instantiate Java objects including nested class objects
Topic 2	Secure resource access including filesystems, manage policies and execute privileged code Develop thread-safe code, using different locking mechanisms
Topic 3	Define and use fields and methods, including instance, static and overloaded methods Working with Arrays and Collections
Topic 4	Deploy and execute modular applications, including automatic modules Implement functional interfaces using lambda expressions
Topic 5	Create and use subclasses and superclasses, including abstract classes Use local variable type inference, including as lambda parameters
Topic 6	Develop code that mitigates security threats such as denial of service Use Java Streams to filter, transform and process data

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Oracle Java SE 11 Developer Sample Questions (Q47-Q52):

NEW QUESTION # 47
Which two are functional interfaces? (Choose two.)

• A. Option B
• B. Option A
• C. Option D
• D. Option C
• E. Option E

Answer: D,E
NEW QUESTION # 48
Given:

executed using command:
java Hello "Hello World" Hello World
What is the output?

• A. An exception is thrown at runtime.
• B. Hello WorldHelloWorld
• C. Hello WorldHello World
• D. HelloHello WorldHelloWorld
• E. Hello World Hello World

Answer: E
NEW QUESTION # 49
Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

• A. .map(e > e.getLocality())
  .collect(Collectors.toSet())
  .count();
• B. .filter(Employee::getLocality)
  .distinct()
  .count();
• C. map(e > e.getLocality())
  .count();
• D. .map(Employee::getLocality)
  .distinct()
  .count();

Answer: B
NEW QUESTION # 50
Given:

Which is true?

• A. The code prints 25.
• B. The code throws an exception at runtime.
• C. The code compiles but does not print any result.
• D. The code does not compile.

Answer: D
NEW QUESTION # 51
Given the code fragment:

What is the output?

• A. The compilation fails.
• B. [-3, -2, -1]
• C. A runtime exception is thrown.
• D. [-1, -2, -3]

Answer: C
NEW QUESTION # 52
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