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Entry Level

In Sep. 2020, Oracle combined the 815 and 816 into the 819.

Preparation Materials

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

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

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

Java Platform Module System

Java I/O API

Database Applications with JDBC

Connect to and perform database SQL operations, process query results using JDBC API

Annotations

Controlling Program Flow

Exception Handling

Handle exceptions using try/catch/finally clauses, try-with-resource, and multi-catch statements
Create and use custom exceptions

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

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

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

Localization

Implement Localization using Locale, resource bundles, and Java APIs to parse and format messages, dates, and numbers

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