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subject > component > module > Java module > Java package > java.io

java.io
subject			fact

java.io	has part InputStream
	has part OutputStream
	is a subtopic of 3.5 - Technology Needed to Build Client-Server Systems
	is an instance of Java package
Java package	can be imported by using the import statement
	defines a name space
	has purpose to group together related classes into a subsystem
	has part class in a package
	has part Java package name
	implements subsystem
package^2	see also package
	see also package^3
module	has high cohesion if related aspects of a system are kept together in this module, and unrelated aspects are kept out
	lacks side effects if it does not modify any data, and does not leave behind any information, other than its result, that would have an effect on other computations
component	is reusable if it can be used in several different systems with little or no modification
	may perform a special-purpose function such as the user interface for a particular system

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