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Free demo questions for Oracle 1Z0-819 Exam Dumps Below:
NEW QUESTION 1
Given:
Which expression when added at line 1 will produce the output of 1.17?
- A. float z = (float)(Math.round((float)x/y*100)/100);
- B. float z = Math.round((int)(x/y),2);
- C. float z = Math.round((float)x/y,2);
- D. float z = Math.round((float)x/y*100)/(float)100;
Answer: D
Explanation:
NEW QUESTION 2
Which interface in the java.util.function package will return a void return type?
- A. Supplier
- B. Predicate
- C. Function
- D. Consumer
Answer: D
NEW QUESTION 3
Which two commands are used to identify class and module dependencies? (Choose two.)
- A. jmod describe
- B. java Hello.java
- C. jdeps --list-deps
- D. jar --show-module-resolution
- E. java --show-module-resolution
Answer: CE
NEW QUESTION 4
Given:
Which two statements are valid to be written in this interface? (Choose two.)
- A. public abstract void methodB();
- B. final void methodG(){System.out.println(“G”);}
- C. private abstract void methodC();
- D. public String methodD();
- E. public int x;
- F. final void methodE();
- G. public void methodF(){System.out.println(“F”);}
Answer: AD
NEW QUESTION 5
Given the code fragment:
What is the result?
- A. 23
- B. 12
- C. 123
- D. 13
Answer: A
Explanation:
NEW QUESTION 6
Examine this excerpt from the declaration of the java.se module:
What does the transitive modifier mean?
- A. Only a module that requires the java.se module is permitted to require the java.sql module.
- B. Any module that requires the java.se module does not need to require the java.sql module.
- C. Any module that attempts to require the java.se module actually requires the java.sql module instead.
- D. Any module that requires the java.sql module does not need to require the java.se module.
Answer: A
NEW QUESTION 7
Given the contents:
MessageBundle.properties file: message=Hello MessageBundle_en.properties file: message=Hello (en) MessageBundle_US.properties file: message=Hello (US) MessageBundle_en_US.properties file: message=Hello (en_US) MessageBundle_fr_FR.properties file: message=Bonjour
and the code fragment: Locale.setDefault(Locale.FRANCE);
Locale currentLocale = new Locale.Builder().setLanguage(“en”).build();
ResourceBundle messages = ResourceBundle.getBundle(“MessageBundle”, currentLocale); System.out. println(messages.getString(“message”));
Which file will display the content on executing the code fragment?
- A. MessageBundle_en_US.properties
- B. MessageBundle_en.properties
- C. MessageBundle_fr_FR.properties
- D. MessageBundle_US.properties
- E. MessageBundle.properties
Answer: C
NEW QUESTION 8
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.
Answer: D
NEW QUESTION 9
Given the code fragment:
What is the result?
- A. 01
- B. 1
- C. The program prints nothing.
- D. It prints 1 in the infinite loop.
Answer: D
NEW QUESTION 10
Given:
Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)
- A. public List<Integer> foo(Set<CharSequence> m) { ... }
- B. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
- C. public List<Integer> foo(TreeSet<String> m) { ... }
- D. public List<Integer> foo(Set<String> m) { ... }
- E. public List<Object> foo(Set<CharSequence> m) { ... }
- F. public ArrayList<Integer> foo(Set<String> m) { ... }
Answer: BC
NEW QUESTION 11
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<Print> loader = ServiceLoader.load (Print.class);
- C. private java.util.ServiceLoader<Print> loader = new java.util.ServiceLoader<> ();
- D. private Print print = new com.service.Provider.PrintImpl();
Answer: B
NEW QUESTION 12
Given:
Which two interfaces can be used in lambda expressions? (Choose two.)
- A. MyInterface1
- B. MyInterface3
- C. MyInterface5
- D. MyInterface2
- E. MyInterface4
Answer: CD
NEW QUESTION 13
Which command line runs the main class com.acme.Main from the module com.example?
- A. java --module-path mods com.example/com.acme.Main
- B. java –classpath com.example.jar com.acme.Main
- C. java --module-path mods -m com.example/com.acme.Main
- D. java -classpath com.example.jar –m com.example/com.acme.Main
Answer: D
NEW QUESTION 14
Given:
executed using this command: java Myclass My Car is red What is the output of this class?
- A. Car--red--My
- B. My--Car--is
- C. My--is--java
- D. java--Myclass--My
- E. Myclass--Car--red
Answer: A
NEW QUESTION 15
Given:
Which annotation should be used to remove warnings from compilation?
- A. @SuppressWarnings on the main and print methods
- B. @SuppressWarnings(“unchecked”) on main and @SafeVarargs on the print method
- C. @SuppressWarnings(“rawtypes”) on main and @SafeVarargs on the print method
- D. @SuppressWarnings(“all”) on the main and print methods
Answer: B
Explanation:
NEW QUESTION 16
Given:
Why does D cause a compilation error?
- A. D inherits a() only from C.
- B. D inherits a() from B and C but the return types are incompatible.
- C. D extends more than one interface.
- D. D does not define any method.
Answer: B
NEW QUESTION 17
Given:
Which two allow a.Main to allocate a new Person? (Choose two.)
- A. In Line 1, change the access modifier to privateprivate Person() {
- B. In Line 1, change the access modifier to publicpublic Person() {
- C. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
- D. In Line 2, change the access modifier to protectedprotected class Main {
- E. In Line 1, remove the access modifierPerson() {
Answer: BC
NEW QUESTION 18
Given the code fragment:
var pool = Executors.newFixedThreadPool(5);
Future outcome = pool.submit(() > 1);
Which type of lambda expression is passed into submit()?
- A. java.lang.Runnable
- B. java.util.function.Predicate
- C. java.util.function.Function
- D. java.util.concurrent.Callable
Answer: D
NEW QUESTION 19
Given: Automobile.java
Car.java
What must you do so that the code prints 4?
- A. Remove the parameter from wheels method in line 3.
- B. Add @Override annotation in line 2.
- C. Replace the code in line 2 with Car ob = new Car();
- D. Remove abstract keyword in line 1.
Answer: B
Explanation:
NEW QUESTION 20
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