Looking forward to showcase your Java skills to your next potential employer? Oracle certification helps you get there. The Java SE 11 Developer 1Z0-819 exam consists of 50 multiple choice questions to be completed within 90 minutes and you need to score 68% to pass the exam.
Usually Oracle certification costs $330 but there is a limited time offer from Oracle celebrating the 25th year. Until April 25th 2021, you can subscribe for free Java training and take the Oracle Certified Professional Java SE 11 Developer 1Z0-819 exam just for 25 USD. Due to the COVID-19 pandemic, you can attempt the exam online from your home so I'd highly recommend using this opportunity if you are looking forward to take the exam or upgrade your existing Java certificate.
Exam Topics:
Working with Java data types
- Use primitives and wrapper classes, including, operators, parentheses, type promotion and casting
- Handle text using String and StringBuilder classes
- Use local variable type inference, including as lambda parameters
Controlling Program Flow
- Create and use loops, if/else, and switch statements
Java Object-Oriented Approach
- Declare and instantiate Java objects including nested class objects, and explain objects' lifecycles (including creation, dereferencing by reassignment, and garbage collection)
- Define and use fields and methods, including instance, static and overloaded methods
- Initialize objects and their members using instance and static initialiser statements and constructors
- Understand variable scopes, apply encapsulation and make objects immutable
- Create and use subclasses and superclasses, including abstract classes
- Utilize polymorphism and casting to call methods, differentiate object type versus reference type
- Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
- Create and use enumerations
Exception Handling
- Handle exceptions using try/catch/finally clauses, try-with-resource, and multi-catch statements
- Create and use custom exceptions
Working with Arrays and Collections
- Use generics, including wildcards
- Use a Java array and List, Set, Map and Deque collections, including convenience methods
- Sort collections and arrays using Comparator and Comparable interfaces
Working with Streams and Lambda expressions
- Implement functional interfaces using lambda expressions, including interfaces from the java.util.function package
- Use Java Streams to filter, transform and process data
- Perform decomposition and reduction, including grouping and partitioning on sequential and parallel streams
Java Platform Module System
- Deploy and execute modular applications, including automatic modules
- Declare, use, and expose modules, including the use of services
Concurrency
- Create worker threads using Runnable and Callable, and manage concurrency using an ExecutorService and java.util.concurrent API
- Develop thread-safe code, using different locking mechanisms and java.util.concurrent API
Java I/O API
- Read and write console and file data using I/O Streams
- Implement serialization and deserialization techniques on Java objects
- Handle file system objects using java.nio.file API
Secure Coding in Java SE Application
- Develop code that mitigates security threats such as denial of service, code injection, input validation and ensure data integrity
- Secure resource access including filesystems, manage policies and execute privileged code
Database Applications with JDBC
- Connect to and perform database SQL operations, process query results using JDBC API
Localization
- Implement Localization using Locale, resource bundles, and Java APIs to parse and format messages, dates, and numbers
Annotations
- Create, apply, and process annotations
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