Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Classpath is an argument - set either on the command-line, or through an environment variable - that tells the Java Virtual Machine where to look for user-defined classes and packages when running Java programs.Similar to the classic dynamic loading behavior, when executing Java programs, the Java Virtual Machine finds and loads classes lazily (it loads the bytecode of a class only when this class is first used). The classpath tells Java where to look on the filesystem for files defining these classes.By default only the packages of the JDK standard API and extension packages are accessible without needing to set where to find them. The path for all user-defined packages and libraries must be set in the command-line (or in the Manifest associated with the Jar file containing the classes).

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