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Trail: Learning the Java Language (The Java™ Tutorials) This trail covers the fundamentals of programming in the Java programming language. Object-Oriented Programming Concepts teaches you the core concepts behind object-oriented programming: objects, messages, classes, and inheritance. This lesson ends by showing you how these concepts translate into code. Feel free to skip this lesson if you are already familiar with object-oriented programming. Language Basics describes the traditional features of the language, including variables, arrays, data types, operators, and control flow. Classes and Objects describes how to write the classes from which objects are created, and how to create and use the objects. Annotations are a form of metadata and provide information for the compiler. Interfaces and Inheritance describes interfaces—what they are, why you would want to write one, and how to write one. Numbers and Strings This lesson describes how to use Number and String objects The lesson also shows you how to format data for output.