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Oracle 1z0-819 Exam Dumps

Oracle 1z0-819 Exam Dumps

Java SE 11 Developer

Total Questions : 257
Update Date : March 26, 2024
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1z0-819 Exam Dumps


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Oracle 1z0-819 Sample Questions

Question # 1

Which two describe reasons to modularize the JDK? (Choose two.)

A. easier to understand the Java language
B. improves security and maintainability
C. easier to expose implementation details
D. improves application robustness
E. easier to build a custom runtime linking application modules and JDK modules



Question # 2

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



Question # 3

Given the code fragment:Path source = Paths.get(“/repo/a/a.txt”);Path destination = Paths.get(“/repo”);Files.move(source, destination); // line 1Files.delete (source); // line 2Assuming the source file and destination folder exist, what Is the result?

A. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
B. A java.nio.file.NoSuchFileException is thrown on line 2.
C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
D. a.txt is renamed repo.



Question # 4

Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

A. Interfaces cannot have protected methods but abstract classes can.
B. Both interfaces and abstract classes can have final methods.
C. Interfaces cannot have instance fields but abstract classes can.
D. Interfaces cannot have static methods but abstract classes can.
E. Interfaces cannot have methods with bodies but abstract classes can.



Question # 5

Which is a proper JDBC URL? 

A. jdbe.mysql.com://localhost:3306/database  
B. http://localhost.mysql.com:3306/database 
C. http://localhost mysql.jdbc:3306/database 
D. jdbc:mysql://localhost:3306/database 



Question # 6

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)); 



Question # 7

Given the contents:MessageBundle.properties file:message=HelloMessageBundle_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=Bonjourand 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



Question # 8

Which describes an aspect of Java that contributes to high performance? 

A. Java prioritizes garbage collection.
B. Java has a library of built-in functions that can be used to enable pipeline burst execution.
C. Java monitors and optimizes code that is frequently executed.
D. Java automatically parallelizes code execution.



Question # 9

Given:String originalPath = “data\\projects\\a-project\\..\\..\\another-project”;Path path = Paths.get(originalPath);System.out.print(path.normalize());What is the result?

A. data\another-project
B. data\projects\a-project\another-project
C. data\\projects\\a-project\\..\\..\\another-project
D. data\projects\a-project\..\..\another-project



Question # 10

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.