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Understanding functional and technical aspects of Java SE 11 Developer Exam Number: 1Z0-819

The following will be discussed in the ORACLE 1Z0-006 exam dumps:

• Create and use enumerations
• Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
• Understand variable scopes, apply encapsulation and make objects immutable
• Develop code that mitigates security threats such as denial of service, code injection, input validation and ensure data integrity
• Utilize polymorphism and casting to call methods, differentiate object type versus reference type
• Declare and instantiate Java objects including nested class objects, and explain objects' - lifecycles (including creation, dereferencing by reassignment, and garbage collection)
• Initialize objects and their members using instance and static initialiser statements and constructors
• Create and use subclasses and superclasses, including abstract classes
• Define and use fields and methods, including instance, static and overloaded methods

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Oracle Java SE 11 Developer Sample Questions (Q136-Q141):

NEW QUESTION # 136
Assuming the Widget class has a getPrice method, this code does not compile:

Which two statements, independently, would allow this code to compile? (Choose two.)

• A. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
• B. Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).
• C. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
• D. Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).

Answer: A,B
NEW QUESTION # 137
Given:

Which is true?

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

Answer: C
NEW QUESTION # 138
Given:

What is required to make the Foo class thread safe?

• A. Replace the lock constructor call with new ReentrantLock (true).
• B. No change is required.
• C. Move the declaration of lock inside the foo method.
• D. Make the declaration of lock static.

Answer: A
NEW QUESTION # 139
Given:

Why does D cause a compilation error?

• A. D extends more than one interface.
• B. D inherits a() only from C.
• C. D inherits a() from B and C but the return types are incompatible.
• D. D does not define any method.

Answer: C
NEW QUESTION # 140
Given:

Which line of code results in a compilation error?

• A. line n3
• B. line n1
• C. line n4
• D. line n2

Answer: C Explanation:

NEW QUESTION # 141
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