Preparation of the OCP Java SE 11 Professional Developer

• 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

• Create and use loops, if/else, and switch statements
• Java Object-Oriented Approach

• 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

• 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 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

• Use Java Streams to filter, transform and process data
• Perform decomposition and reduction, including grouping and partitioning on sequential and parallel streams

• Deploy and execute modular applications, including automatic modules
• Declare, use, and expose modules, including the use of services

• 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

• 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

• 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

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

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

• Create, apply, and process annotations