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Oracle 1Z0-819 (Java SE 11 Developer) Exam is a certification exam that validates a developer's knowledge and skills in using Java programming language and related technologies. 1z1-819 exam is designed for developers who have experience working with Java and want to demonstrate their proficiency in Java SE 11.

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Oracle Java SE 11 Developer Sample Questions (Q228-Q233):

NEW QUESTION # 228
Given the code fragment:

Which action enables Computatorclass to compile?

A. change Line 3 to Double sum = 0.0;B. change Line 2 to public Double sum ( C collection) {C. change Line 4 to for (Double n : collection) {D. change Line 5 to List<Double> numbers = List.of(5, 4, 6, 3, 7, 2, 8, 1, 9);E. change Line 1 to add throws NumberFormatException

Answer: B


NEW QUESTION # 229
Given:

Which is true?

A. System.in is the standard input stream. The stream is already open.B. System.out is the standard output stream. The stream is open only when System.out is called.C. System.out is an instance of java.io.OutputStream by default.D. System.in cannot reassign the other stream.

Answer: A


NEW QUESTION # 230
Given:

Why does D cause a compilation error?

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

Answer: B


NEW QUESTION # 231
Given:

You want to implement the java.io.Serializable interface to the MyPersistenceData class.
Which method should be overridden?

A. the readExternal and writeExternal methodB. the readExternal methodC. nothingD. the writeExternal method

Answer: A


NEW QUESTION # 232
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 # 233
......

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