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syntactic unit > scoping unit > package > java.lang

java.lang
subject			fact

java.lang	has specification
	is the only package that all classes automatically have access to
	is a subtopic of Example Packages
	is a subtopic of Java Basics
	is an instance of package
	is imported automatically by the runtime system
package	can be imported by using the import statement
	contains 0 or more classes and 0 or more interfaces
	defines a name space
	groups classes or interfaces by function
	has purpose to avoid naming conflicts to control access
	has purpose to group together related classes into a subsystem
	is specified by a file that begins with a package statement
	is stored as a set of class files in a directory
	see also package name
	to create you put a class in it or put an interface in it by putting a package statement at the top of the source file in which the class or interface is defined
	to import you use the import statement with the asterisk wildcard character
syntactic unit	has syntax rule bold = mandatory italic = non-terminal normal font = optional

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