Oracle 1Z0-816 Online Practice Questions and Exam Preparation

Oracle 1Z0-816 Online Questions & Answers

• Question 41:

  Given: What will secure this code from a potential Denial of Service condition?

  

  A. After Line 4, add indexReader.close().
  B. On Line 3, enclose processData(dataReader) with try with resources.
  C. After Line 3, add dataReader.close().
  D. On Line 1, use try with resources when opening each dataReader.
  E. Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.
  B. On Line 3, enclose processData(dataReader) with try with resources.

• Question 42:

  Given:

  jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar

  Which describes the expected output?

  A. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
  B. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the -verbose options to output to the console.
  C. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
  D. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
  A. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.

  ---

  -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

• Question 43:

  Given:

  

  You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?

  A. Extend AutoCloseable and override the close method.
  B. Implement AutoCloseable and override the autoClose method.
  C. Extend AutoCloseable and override the autoClose method.
  D. Implement AutoCloseable and override the close method.
  D. Implement AutoCloseable and override the close method.

  ---

  Reference: https://stackabuse.com/the-try-with-resources-statement-in-java/

• Question 44:

  Which code fragment compiles?

  

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

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• Question 45:

  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.

  ---

  Reference: https://wiki.sei.cmu.edu/confluence/display/java/ENV03-J.+Do+not+grant+dangerous+combinations+of+permissions

• Question 46:

  var numbers = List.of(0,1,2,3,4,5,6,7,8,9);

  You want to calculate the average of numbers.

  Which two codes will accomplish this? (Choose two.)

  A. double avg = numbers.stream().parallel().averagingDouble(a -> a);
  B. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble();
  C. double avg = numbers.stream().mapToInt (i -> i).average().parallel();
  D. double avg = numbers.stream().average().getAsDouble();
  E. double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));
  B. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble();
  D. double avg = numbers.stream().average().getAsDouble();

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• Question 47:

  Which three annotation uses are valid? (Choose three.)

  A. Function func = (@NonNull x) -> x.toUpperCase();
  B. var v = "Hello" + (@Interned) "World"
  C. Function func = (var @NonNull x) -> x.toUpperCase();
  D. Function func = (@NonNull var x) -> x.toUpperCase();
  E. var myString = (@NonNull String) str;
  F. var obj = new @Interned MyObject();
  A. Function func = (@NonNull x) -> x.toUpperCase();
  C. Function func = (var @NonNull x) -> x.toUpperCase();
  F. var obj = new @Interned MyObject();

• Question 48:

  Which code fragment does a service use to load the service provider with a Print interface?

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

  ---

  Reference: https://docs.oracle.com/javase/8/docs/api/?java/util/ServiceLoader.html

• Question 49:

  Which two statements independently compile? (Choose two.)

  A. List
  B. List
  C. List
  D. List
  E. List
  A. List
  C. List

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• Question 50:

  Given:

  

  And the command: java Main Helloworld What is the result ?

  A. Input: Echo:
  B. Input: Helloworld Echo: Helloworld
  C. Input: Then block until any input comes from System.in.
  D. Input: Echo: Helloworld
  E. A NullPointerException is thrown at run time.
  C. Input: Then block until any input comes from System.in.