Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 121:

  Given:

  

  Which two are secure serialization of these objects? (Choose two.)

  A. Define the serialPersistentFields array field.
  B. Declare fields transient.
  C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
  D. Make the class abstract.
  E. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
  A. Define the serialPersistentFields array field.
  C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.

• Question 122:

  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);

• Question 123:

  Given:

  

  What is the result?

  A. Map: 0 Keys: 0 Values: 0
  B. The compilation fails.
  C. Map: 4 Keys: 4 Values: 4
  D. Map: 4 Keys: 0 Values: 0
  E. Map: 0 Keys: 4 Values: 4
  D. Map: 4 Keys: 0 Values: 0

• Question 124:

  Given the code fragment:

  

  Which can replace line 2?

  A. UnaryOperator u = (int i) -> i * 2;
  B. UnaryOperator u = (var i) -> (i * 2);
  C. UnaryOperator u = var i -> { return i * 2; };
  D. UnaryOperator u = i -> { return i * 2);
  B. UnaryOperator u = (var i) -> (i * 2);

• Question 125:

  Given:

  

  and

  

  What is the result?

  A. An exception is thrown at runtime.
  B. The compilation fails.
  C. SILVER10
  D. SILVER10 platinum20
  E. SILVER10 PLATINUM20
  B. The compilation fails.

• Question 126:

  Given:

  var data = new ArrayList<>();

  data.add("Peter");

  data.add(30);

  data.add("Market Road");

  data.set(1, 25);

  data.remove(2);

  data.set(3, 1000L);

  System.out.print(data);

  What is the output?

  A. [Market Road, 1000]
  B. [Peter, 30, Market Road]
  C. [Peter, 25, null, 1000]
  D. An exception is thrown at run time.
  D. An exception is thrown at run time.

• Question 127:

  Given:

  

  What is the result?

  A. watermelon orange lemon grape apricot apple
  B. nothing
  C. apple apricot grape lemon orange watermelon
  D. apple orange grape lemon apricot watermelon
  A. watermelon orange lemon grape apricot apple

• Question 128:

  Given:

  

  What is the result?

  A. A ClassCastException is thrown at runtime.
  B. AnotherClass#methodA()AnotherClass#methodA()
  C. The compilation fails.
  D. SomeClass#methodA()AnotherClass#methodA()
  E. AnotherClass#methodA()SomeClass#methodA()
  F. SomeClass#methodA()SomeClass#methodA()
  C. The compilation fails.

• Question 129:

  Given: After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

  

  A. after line 8
  B. after line 6
  C. after line 5
  D. after line 10
  B. after line 6

• Question 130:

  Given:

  

  Which action must you perform to print Verified?

  A. Make the verify method public and invoke it from the main method.
  B. Invoke the verify method from the place method.
  C. Change the declaration of the order variable to orderService order = New order(); and Invoke the verify method from the main method.
  D. Invoke the verify method from the main method.
  B. Invoke the verify method from the place method.