Basic I/O covers the Java platform classes used for basic input and output. It focuses primarily on I/O Streams, a powerful concept that greatly simplifies I/O operations. The lesson also looks at Serialization, which lets a program write whole objects out to streams and read them back again. Then the lesson looks at some file system operations, including random access files. Finally, it touches briefly on the advanced features of the New I/O API.

Generics are a powerful feature of the Java programming language. They improve the type safety of your code, making more of your bugs detectable at compile time. Annotations are a form of metadata and provide information for the compiler. This lesson describes where and how to use annotations in a program effectively.

JDK 21 Documentation

Numbers and Strings This lesson describes how to use Number and String objects The lesson also shows you how to format data for output. Due to limited intellectual property protection and enforcement
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The Platform Environment is defined by the underlying operating system, the Java virtual machine, the class libraries, and various configuration data supplied when the application is launched. This lesson describes some of the APIs an application uses to examine and configure its platform environment. These binaries are provided primarily for use by implementors of
the Java SE 7 Platform Specification and are recommended for
reference purposes only. The Reference Implementations have been
approved by the JCP and will receive no further updates, not even
for security issues. Binaries for development and production use
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Oracle and in most popular Linux distributions.

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With the knowledge you now have of the basics of the Java programming language, you can learn to write your own classes. In this
lesson,
you will find information about defining your own classes, including declaring member variables, methods, and constructors. Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites.

For example, a candidate with a good knowledge of C# should be able to benefit from this material, even if one does not have prior experience in Java. Exceptions explains the exception mechanism and how it is used to handle errors and other exceptional conditions. This lesson describes what an exception is, how to throw and catch exceptions, what to do with an exception once it has been caught, and how to use the exception class hierarchy.