The modifiers in the class head control how other classes can access this one:
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public -- May be used by code outside the class package
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private -- this class can only be used within current file
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friendly(i.e. empty ClassModifier) -- class can be used only within current package (directory)
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protected -- Only accessible to subclasses
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These modifiers are also used for access control to the instance variables and methods.
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There are other modifiers. For example, a static variable or method only has the same value for all instances of the class. A final variable cannot be assigned to (used for constants).
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