Oracle 1z0-819 Exam Dumps

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

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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

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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.

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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.

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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 

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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)); 

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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

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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.

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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

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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.  

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Question # 11

Given:LocalDate d1 = LocalDate.of(1997,2,7);DateTimeFormatter dtf =DateTimeFormatter.ofPattern( /*insert code here*/ );System.out.println(dtf.format (d1));Which pattern formats the date as Friday 7th of February 1997?

A. “eeee dd+”th of”+ MMM yyyy”
B. “eeee dd'th of' MMM yyyy”
C. “eeee d+”th of”+ MMMM yyyy”
D. “eeee d’th of’ MMMM yyyy”

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Question # 12

Which two statements are correct about try blocks? (Choose two.) 

A. A try block can have more than one catch block.
B. A finally block in a try-with-resources statement executes before the resources declaredare closed.
C. A finally block must be immediately placed after the try or catch blocks.
D. A try block must have a catch block and a finally block.
E. catch blocks must be ordered from generic to specific exception types.

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Question # 13

Which two safely validate inputs? (Choose two.)

A. Delegate numeric range checking of values to the database.
B. Accept only valid characters and input values.
C. Use trusted domain-specific libraries to validate inputs.
D. Assume inputs have already been validated.
E. Modify the input values, as needed, to pass validation. 

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Question # 14

Which two statements are correct about modules in Java? (Choose two.) 

A. java.base exports all of the Java platforms core packages.
B. module-info.java can be placed in any folder inside module-path.
C. A module must be declared in module-info.java file.
D. module-info.java cannot be empty.
E. By default, modules can access each other as long as they run in the same folder.

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Question # 15

Which describes a characteristic of setting up the Java development environment? 

A. Setting up the Java development environment requires that you also install the JRE.  
B. The Java development environment is set up for all operating systems by default.  
C. You set up the Java development environment for a specific operating system when you install the JDK
D. Setting up the Java development environment occurs when you install an IDE before the JDK.  

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