Basic HTML version of Foils prepared 18 May 97

Foil 42 Java Language -- Types of Classes - I

From Java Tutorial - Spring 1997 Part II: Java Language and Object-Oriented Concepts Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox


1 Possible ClassModifiers are:
2 abstract -- Contains abstract methods without implementation -- typically such abstract classes have several subclasses that define implementation of methods
3 public -- May be used by code outside the class package and (unix) file must be called ClassName.java where ClassName is unique public class in file
4 private -- this class can only be used within current file -- i.e current class
5 friendly(i.e. empty ClassModifier) -- class can be used only within current package
6 protected -- Only accessible to subclasses

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