Programación en Java - Certificación OCP Java SE Developer - Online

Understanding Java Technology and environment

• Describe Java Technology and the Java development
• Identify key features of the Java language
• Describe the Java Development Kit (JDK) and the Java Runtime Environment (JRE)
• Describe the components of object-oriented programming
• Describe the components of a basic Java program
• Compile and execute a Java program

Creating a Simple Java Program

• Create an executable Java program with a main class
• Identify the conventions to be followed in a Java program
• Use single-line and multi-line comments in Java programs
• Use Java reserved words
• Compile and run a Java program from the command line
• Create and import packages
• Import other Java packages to make them accessible in your code
• Describe the java.lang package

Java Platform Module System

• Describe the Modular JDK
• Declare modules and enable access between modules
• Describe how a modular project is compiled and run

Migration to a Modular Application

• Migrate the application developed using a Java version prior to SE 9 to SE 11
• Top-down and bottom-up migration
• Splitting a Java SE 8 application into modules for migration
• Use jdeps to determine dependencies and identify ways to address the cyclic dependencies

Working with Java Data Types

• Declare and initialize variables including a variable using final
• Cast a value from one data type to another including automatic and manual promotion
• Declare and initialize a String variable

Working with Java Operators

• Use basic arithmetic operators to manipulate data including +, -, *, /, and %
• Use the increment and decrement operators
• Use relational operators including ==, !=, >, >=, <, and <=
• Use arithmetic assignment operators
• Use conditional operators including &&, ||, and ?
• Describe the operator precedence and use of parenthesis

Using Decision Statements

• Use the decision making statement (if-then and if-then-else)
• Use the switch statement
• Compare how == differs between primitives and objects
• Compare two String objects by using the compareTo and equals methods

Using Looping Statements

• Describe looping statements
• Use a for loop including an enhanced for loop
• Use a while loop
• Use a do-while loop
• Compare and contrast the for, while, and do-while loops
• Develop code that uses break and continue statements

Arrays and ArrayLists

• Use a one-dimensional array
• Create and manipulate an ArrayList
• Traverse the elements of an ArrayList by using iterators and loops including the enhanced for loop
• Compare an array and an ArrayList

Describing and Using Objects and Classes

• Declare and instantiate Java objects
• Explain object's lifecycles (including creation, dereferencing by reassignment, and garbage collection)
• Define the structure of a Java class
• Read or write to object fields

Creating and Using Methods

• Create methods and constructors with arguments and return values
• Create and invoke overloaded methods
• Apply the static keyword to methods and fields

Applying Encapsulation

• Apply access modifiers
• Apply encapsulation principles to a class

Reusing Implementations Through Inheritance

• Create and use subclasses and superclasses
• Create and extend abstract classes
• Enable polymorphism by overriding methods
• Utilize polymorphism to cast and call methods, differentiating object type versus reference type
• Distinguish overloading, overriding, and hiding

Exception Handling and Assertions

• Describe the advantages of Exception handling and differentiate among checked, unchecked exceptions, and Errors
• Create try-catch blocks and determine how exceptions alter program flow
• Create and invoke a method that throws an exception
• Use the try-with-resources construct
• Create and use custom exception classes
• Test invariants by using assertions

Java Nested Classes and Enumerations

• Create and use inner, nested and anonymous classes
• Create and use final classes
• Create and use enumerations

Java Interfaces

• Create and use interfaces with default methods
• Create and use interfaces with private methods
• Functional Interface and Lambda Expressions
• Define and write functional interfaces
• Create and use lambda expressions including statement lambdas, local-variable for lambda parameters

Built-in Functional Interfaces

• Use interfaces from the java.util.function package
• Use core functional interfaces including Predicate, Consumer, Function and Supplier
• Use primitive and binary variations of base interfaces of java.util.function package

Java Stream API

• Describe the Stream interface and pipelines
• Use lambda expressions and method references

Lambda Operations on Streams

• Extract stream data using map, peek and flatMap methods
• Search stream data using search findFirst, findAny, anyMatch, allMatch and noneMatch methods
• Use the Optional class
• Perform calculations using count, max, min, average and sum stream operations
• Sort a collection using lambda expressions
• Use Collectors with streams, including the groupingBy and partitioningBy operations

Parallel Streams

• Develop code that uses parallel streams
• Implement decomposition and reduction with streams

Java Collections Framework and Generics

• Use wrapper classes, autoboxing and autounboxing
• Create and use generic classes, methods with diamond notation and wildcards
• Describe the Collections Framework and use key collection interfaces
• Use Comparator and Comparable interfaces
• Create and use convenience methods for collections

Java I/O API (Fundamentals and NIO2)

• Read data from and write console and file data using I/O Streams
• Use I/O Streams to read and write files
• Read and write objects by using serialization
• Use the Path interface to operate on file and directory paths
• Use the Files class to check, delete, copy or move a file or directory
• Use the Stream API with Files

Database Applications with JDBC

• Connect to databases using JDBC URLs and DriverManager
• Use PreparedStatement to perform CRUD operations
• Use PreparedStatement and CallableStatement APIs to perform database operations

Java Annotations

• Describe the purpose of annotations and typical usage patterns
• Apply annotations to classes and methods
• Describe commonly used annotations in the JDK
• Declare custom annotations

Localization in Java

• Use the Locale class
• Use resource bundles
• Format messages, dates, and numbers with Java

Java Concurrency and Multithreading

• Create worker threads using Runnable, Callable and use an ExecutorService to concurrently execute tasks
• Use java.util.concurrent collections and classes including CyclicBarrier and CopyOnWriteArrayList
• Write thread-safe code
• Identify threading problems such as deadlocks and livelocks