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Java, A Beginner’s Guide, 5th Edition by Herbert Schildt

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Java’s Class Library Is Contained in Packages

As explained earlier in this book, Java defines a large number of standard classes that are available to all programs. This class library is often referred to as the Java API (Application Programming Interface). The Java API is stored in packages. At the top of the package hierarchy is java. Descending from java are several subpackages, including these:

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Since the beginning of this book, you have been using java.lang. It contains, among several others, the System class, which you have been using when performing output using println( ). The java.lang package is unique because it is imported automatically ...

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