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source file
subject			fact

source file	if a source file does not contain a package statement then the classes and interfaces the file contains are members of the default package
	when a source file is compiled the compiler creates an output file for each class and interface defined in the source file
	can use the import statement to use the facilities of another package
	has definition A file that contains source code
	has example the file called Demonstrate.java contains the class Demonstrate
	has extension .java
	is a subtopic of How Java Works
	is a kind of file
	may contain 1 or more package statements 0 or more import statements 1 public class declaration 0 or more classes private to the pacakge
	may contain more that one class but only one class can be public
	should be in a directory whose name reflects the name of the package to which the source code belongs
	should declare the package to which its class belongs using the package keyword
file	is the smallest unit of source code that can be compiled