Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 261:

  A company has an existing Java app that includes two Java 8 jar files, sales-3.10. jar and clients-10.2.jar.

  The jar file ,sales -8, 10, jar reference packages in clients -10.2 jar, but clients-10.2 jar does not reference packages in sales -8.10, jar.

  They have decided to modularize clients-10.2.jar.

  Which module-info. Java file would work for the new library version clients-10.3 jar?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  D. Option D

• Question 262:

  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(); }
  C. static String getFirstLetter() { return A.toString(); }

• Question 263:

  Given: /code/a/Test.java containing:

  

  and

  /code/b/Best.java

  containing:

  package b;

  public class Best { }

  Which is the valid way to generate bytecode for all classes?

  A. java /code/a/Test.java
  B. javac -d /code /code/a/Test
  C. java /code/a/Test.java /code/b/Best.java
  D. java -cp /code a.Test
  E. javac -d /code /code/a/Test.java /code/b/Best.java
  F. javac -d /code /code/a/Test.java
  E. javac -d /code /code/a/Test.java /code/b/Best.java

• Question 264:

  Given an application with a main module that has this module-info.java file:

  

  Which two are true? (Choose two.)

  A. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
  B. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
  C. An implementation of country.countryDetails can be added to the main module.
  D. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
  E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
  B. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
  D. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.

• Question 265:

  Given:

  

  Which change would make Foo more secure?

  A. public String beta = "beta";
  B. public static final String ALPHA = "alpha";
  C. private String delta;
  D. protected final String beta = "beta";
  B. public static final String ALPHA = "alpha";

• Question 266:

  Given:

  

  What is the output?

  A. null B. A NoSuchElementException is thrown at run time.
  C. Duke
  D. A NullPointerException is thrown at run time.
  C. Duke

• Question 267:

  Given:

  

  What is the result?

  A. The compilation fails.
  B. -3
  C. An exception is thrown at runtime.
  D. -2
  A. The compilation fails.

• Question 268:

  You are working on a functional bug in a tool used by your development organization. In your investigation, you find that the tool is executed with a security policy file containing this grant.

  

  What action should you take?

  A. Nothing, because it is an internal tool and not exposed to the public.
  B. Remove the grant because it is excessive.
  C. Nothing, because it is not related to the bug you are investigating.
  D. File a security bug against the tool referencing the excessive permission granted.
  E. Nothing, because listing just the required permissions would be an ongoing maintenance challenge.
  D. File a security bug against the tool referencing the excessive permission granted.

• Question 269:

  Given:

  

  and

  

  What is the result?

  A. 214
  B. 2341
  C. 234
  D. 2134
  C. 234

• Question 270:

  Given the Person class with age and name along with getter and setter methods, and this code fragment:

  

  What will be the result?

  A. Aman Tom Peter
  B. Tom Aman Peter
  C. Aman Peter Tom
  D. Tom Peter Aman
  C. Aman Peter Tom