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Oracle 1Z0-819 Exam

Certification Provider: Oracle
Exam Name: Java SE 11 Developer
Number of questions in our database: 225
Exam Version: Feb. 02, 2023
1Z0-819 Exam Official Topics:
  • Topic 1: Define and use fields and methods, including instance, static and overloaded methods/ Working with Arrays and Collections
  • Topic 2: Create and use subclasses and superclasses, including abstract classes/ Use local variable type inference, including as lambda parameters
  • Topic 3: Understand variable scopes, apply encapsulation and make objects immutable/ Connect to and perform database SQL operations, process query results using JDBC API
  • Topic 4: Handle text using String and StringBuilder classes/ Utilize polymorphism and casting to call methods, differentiate object type versus reference type
  • Topic 5: Implement serialization and deserialization techniques on Java objects/ Declare and instantiate Java objects including nested class objects
  • Topic 6: Create and use interfaces, identify functional interfaces/ Initialize objects and their members using instance and static initialiser statements and constructors
  • Topic 7: Deploy and execute modular applications, including automatic modules/ Implement functional interfaces using lambda expressions
  • Topic 8: Develop code that mitigates security threats such as denial of service/ Use Java Streams to filter, transform and process data
  • Topic 9: Use primitives and wrapper classes, including, operators, parentheses, type promotion and casting/ Sort collections and arrays using Comparator and Comparable interfaces
  • Topic 10: Secure resource access including filesystems, manage policies and execute privileged code/ Develop thread-safe code, using different locking mechanisms

Free Oracle 1Z0-819 Exam Actual Questions

The questions for 1Z0-819 were last updated On Feb. 02, 2023

Question #1

Why would you choose to use a peek operation instead of a forEach operation on a Stream?

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Correct Answer: C

Question #2

And the code fragment:

Which situation will occur on code fragment execution?

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Correct Answer: D

Question #3

Given the code fragment:

You want to display the value of currency as $100.00.

Which code inserted on line 1 will accomplish this?

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Correct Answer: A

Question #4

Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method

public void enableService(String hostName, String portNumber)

executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer's code?

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Correct Answer: B

Question #5

Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI

module?

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Correct Answer: A


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