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The Oracle 1Z0-819 exam covers a wide range of topics, including Java syntax and data types, object-oriented programming principles, collections, concurrency, I/O and NIO. It also includes topics such as JDBC, JPA, annotations, lambda expressions, and modules. 1Z0-819 Exam consists of 80 multiple-choice questions and has a time limit of 180 minutes. A passing score of 63% is required to obtain the certification.

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To earn the Oracle 1Z0-819 certification, candidates must pass a two-hour, 60-question exam that covers a range of topics such as Java syntax and data types, encapsulation, inheritance, interfaces, exceptions, IO, concurrency, and collections. 1Z0-819 Exam is designed to test the candidate's ability to write efficient, maintainable, and reusable code that meets the requirements of real-world Java applications.

Oracle Java SE 11 Developer Sample Questions (Q263-Q268):

NEW QUESTION # 263
Given:

Assume the file on path does not exist. What is the result?

A. The compilation fails.
B. /u01/work/filestore.txt is deleted.
C. Exception
D. /u01/work/filestore.txt is not deleted.

Answer: A

Explanation:

NEW QUESTION # 264
Given:

What action ensures successful compilation?

A. Replace enum Color implements Serializable with public enum Color.
B. Replace int c; with private final int c;.
C. Replace int c; with private int c;.
D. Replace public Color(int c) with private Color(int c).
E. Replace enum Color with public enum Color.

Answer: D

Explanation:

NEW QUESTION # 265
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 # 266
Given:

Which two methods facilitate valid ways to read instance fields? (Choose two.)

A. getTCount
B. getACount
C. getTotalCount
D. getGCount
E. getCCount

Answer: C,E

NEW QUESTION # 267
Which code fragment does a service use to load the service provider with a Print interface?

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

Answer: A

NEW QUESTION # 268
......

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