CERTIFICATES

This module explains the java Technology and the Java development environment, identify key features of the Java language, create an executable Java program with a main class, compile and run a Java program from the command line and create and import packages.

This module makes you to declare and initialize variables, identify the scope of variable, use local variable type inference, create and manipulate Strings, manipulate data using the StringBuilder class and its methods, use Java operators including the use of parenthesis to override operator precedence, use Java control statements including if, else,
and switch, create and use do/while, while, for and for each loops, including nested loops, use break and continue statements.

This module makes you to declare, instantiate, initialize and use a one-dimensional array, two-dimensional array, Java objects, object's lifecycles (including creation, dereferencing by reassignment, and garbage collection), structure of a Java class, object fields.

This module presents the creation of methods and constructors with arguments and return values, create and invoke overloaded methods, static keyword to methods and fields, access modifiers and encapsulation principles to a class.

This module makes you to create and use subclasses and superclasses, abstract classes,polymorphism by overriding methods, Utilize polymorphism to cast and call methods, differentiating object type versus reference type, overloading, overriding, and hiding, create and implement interfaces, class inheritance from interface, inheritance including abstract classes, List and ArrayList instances and lambda Expression.

This module makes you to identify 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, Modular JDK, modules and enable access between modules

This module teaches you how to create and use final classes, inner, nested and anonymous classes, enumerations, use try-with-resources construct, custom exception classes and test invariants by using assertions.

This module makes you to create and use interfaces with default methods, interfaces with private methods, wrapper classes, auto-boxing and auto-unboxing, generic classes, methods with diamond notation and wildcards, Collections Framework and use key collection interfaces, Comparator, Comparable interfaces and convenience methods for collections.

This module teaches you to write functional interfaces, lambda expressions including statement lambdas, local-variable for lambda parameters, Stream interface and pipelines, lambda expressions and method references.

This module makes you to identify the interfaces from java.util.function package, use core functional interfaces including predicate, Consumer, Function and Supplier, primitive and binary variations of base, interfaces of java.util.function package, extract stream data using map, peek and flatMap methods, optional class, sort a collection using lambda expressions, Collectors with stream, including the groupingBy and partitioningBy operation.

This module explains abou migrating the application developed using a Java version prior to SE 9 to SE 11 including top-down and bottom-up migration, splitting a Java SE 8 application into modules for migration, Use jdeps to determine dependencies and identify way to address the cyclic dependencies and service type, load services using ServiceLoader, check for dependencies of the services including consumer and provider modules.

This module provides information about the creating worker threads using Runnable, Callable and use an ExecutorService to concurrently execute tasks,use java util concurrent collections and classes, thread-safe codae, identify threading problems such as deadlocks and livelocks, implement decomposition and reduction with stream.

This module provides information about the read data from and write console and file data using I/O stream serialization, use files class to check, delete, copy or move a file or directory, Stream API with Files, preventing Denial of Service, securing confidential information in Java application, implementing Data integrity guidelines-injections and inclusion and input validation, limiting Accessibility and Extensibility, properly handling input validation, and mutablity and Securing constructing sensitive objects, Serialization and Deserialization.

This module provides information to connect to databases using JDBC URLs and DriverManager, use PreparedStatement to perform CRUD operations and CallableStatement APIs to perform database operations, Locale class, resource bundles and format messages, dates, and numbers with Java.