D.2 Program Modules in Java
You write Java programs by combining new methods and classes with predefined ones available in the Java Application Programming Interface (also referred to as the Java API or Java class library) and in various other class libraries. Related classes are typically grouped into packages so that they can be imported into programs and reused. You’ll learn how to group your own classes into packages in Appendix F. The Java API provides a rich collection of predefined classes that contain methods for performing common mathematical calculations, string manipulations, character manipulations, input/output operations, database operations, networking operations, file processing, error checking and many other useful tasks.
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